Imagining Soviet Surveying

Last week I wrote about some of the apparent differences between how the US and the Soviet Union used satellites for mapping and geodesy. The Soviets seem to have been slower to operate dedicated satellites in both areas, with no apparent explanation. Though it’s dubious to use US intelligence estimates as evidence of what the Soviets were actually doing, they do at least shed light on some of the possibilities.

Two CIA reports from from the pre-satellite era, in 1954 and 1957, suggested that if the Soviets had made a connection across the Bering Strait between their own domestic surveys and the North American Datum, missiles launched from near the Bering Strait would have a Circular Error Probable (CEP) of 300–500 feet. Without the connection between datum, the error would be closer to 1,000 feet. without any additional surveys of US territory By making observations of an upcoming solar eclipse and gaining access to the equivalent measurements from US or Western European sites, the CIA predicted the error in intercontinental position could be reduced to about 500 feet from anywhere in the Soviet Union.

These estimates assumed that the target could be located on high-quality American maps, which the analysts presumed were available to Soviet planners. But what if the targets were secret sites not plotted on any maps? A Studies in Intelligence article (“Spy Mission to Montana”) from 1995 revealed that the CIA and Air Force tested those conditions as the silos for Minutemen ICBMs were being built in 1962. A three-person team, two from the CIA and one from the Army Map Service, made covert observations of the sites under construction from their rental car. Dodging both site security and the official survey being done by the Air Force’s 1381st Geodetic Survey Squadron, the covert team proved that observations could be made with a CEP of 600 feet when maps at 1:250,000 scale were available and a CEP of 200 feet with 1:62,500 scale maps.

Did the Soviet Union make a secret measurement of the Bering Strait or send its agents to survey the locations on American missile silos? The answer is probably somewhere in the files of the KGB or GRU.

Soviet Satellites and Mapping

John Davies’ website has announced that his and Alexander Kent’s book The Red Atlas: How the Soviet Union Secretly Mapped the World will be released by University of Chicago Press. Details for the book on the press website show 272 pages and 282 (!) colour plates and a publication month of October 2017. Having read what the authors have written elsewhere about Soviet maps, I’m really looking forward to the book. In particular, I’m hoping it will offer not just more information on how the Soviet military prepared their maps but also some insight into why and for who.

The technical military challenges that drove both American and Soviet cartographic projects during the Cold War were very similar, which leaves the differences in practice between them begging for explanation. Take, for example, the apparent difference in exploiting satellite geodesy. Both countries very swiftly exploited the fact that perturbations in satellite orbits revealed new details on gravity and, by extension, the shape of the earth. They also must have recognized that satellites made better targets for intercontinental triangulation than rockets, stars, or the sun and moon, all conventional targets at the time.

As a result, Sputnik effectively sidelined an American-led terrestrial program of geodetic measurements for the International Geophysical Year that had been under development since 1954. Led by William Markowitz of the US Naval Observatory, using dual-rate cameras of his own design, the program distributed cameras to observatories around the world to make simultaneous moon observations during 1957. Using an approach to triangulation similar to that used during eclipses, the promised precision was to within about 90 feet at each observatory. Uncertainties in the position of the moon meant the 1957 observations never delivered geodetic results, but more substantially the entire concept had been rendered obsolete.

Consequently, in addition to measurement projects that were added to other scientific satellites, the US launched its first dedicated geodetic satellite in 1962. ANNA-1B was a joint Department of Defense-NASA project that carried instruments to enable both triangulation and trilateration. Its launch came only two years after the US lofted its first photo-reconnaissance satellite, which makes sense because both satellites were part of the effort to find and target Soviet strategic missiles.

Intriguingly, then, it was six more years before the Soviet Union launched its own dedicated geodetic satellite. The first of the Sfera series (Russian for “Geoid”) satellites (11F621) flew in 1968, launched from the rocket base at Pleketsk. Built by design bureau OKB-10 on the popular KAUR satellite bus, the Sfera satellites were equipped with lights and radio transmitters similar to those on ANNA-1B. Operational flights ran from 1973 to 1980.

A similar difference was apparent in the case of satellites equipped with cameras for mapping, as opposed to high-resolution reconnaissance photography. A dedicated mapping satellite was among the planned elements of the first US reconnaissance satellite system, the Air Force’s SAMOS (or Satellite and Missile Observation System). That camera, the E-4, never flew, but the Army’s very similar project ARGON was grafted onto the CIA Corona program. ARGON was rendered obsolete by the inclusion of small mapping cameras on subsequent satellite systems but after ARGON’s first launch in 1961 – only one year after the very first US reconnaissance satellite – the US was never without a mapping capacity in orbit.

In the USSR, on the other hand, the first dedicated mapping satellite came quite late. The Zenit-4MT, program name Orion (11F629), was a variant of the main Soviet series of photo-reconnaissance satellites. First launched in 1971 and accepted into operational service in 1976, Orion began flying nine years after the first Soviet photo-reconnaissance satellite was launched. Unlike the Americans, who integrated mapping cameras into other photo-reconnaissance satellites, the Soviets seem to have continued to fly dedicated cartographic systems for the remainder of the Cold War (this is early 2000s information, so it may be obsolete now). Zenit-4MT (Orion) was followed in the early 1980s by the Yantar-1KFT, program name Siluet/Kometa (11F660), a system which combined the propulsion and instrument modules of the latest Soviet photo-reconnaissance satellite with the descent canister from the Zenit-4MT. Flying alongside Kometa was an upgraded Zenit, the Zenit-8, program name Oblik, an interim design introduced because of delays in the former.

I hope The Red Atlas or someone else can explain more about what was happening here, because it certainly looks like the Soviet Union was making very different decisions from the Americans when it came to satellite geodesy and cartography.

Source Notes: Information on Soviet satellites comes from a range of sources, much of it in the Journal of the British Interplanetary Society. For the Orion series, Philip S. Clark, “Orion: The First Soviet Cartographic Satellites,” JBIS vol. 54 (2001), pp. 417–23. For Siluet/Kometa, Philip S. Clark, “Classes of Soviet/Russian Photoreconnaissance Satellites,”JBIS vol. 54 (2001), pp. 344–650. On the launch of Sfera from Pleketsk, Bart Hendrickx,”Building a Rocket Base in the Taiga: The Early Years of the Plesetsk Launch Site (1955-1969) (Part 2),” JBIS vol. 66, Supplement 2 (2013), pp. 220 (and online). For the Markowitz moon camera, Steven J.  Dick, “Geodesy, Time, and the Markowitz Moon Camera Program: An Interwoven International Geophysical Year Story,” in Globalizing Polar Science: Reconsidering the International Polar and Geophysical Years, edited by Roger D. Launius, James Roger Fleming, and David H. DeVorkin (Palgrave Macmillan, 2010).

Stakes in the Sand: Surveying in the Gulf War

In 1990, US forces arrived in the Persian Gulf with a cornucopia of navigation technologies: not just GPS but also LORAN, TACAN, TERCOM (for cruise missiles), and inertial navigation systems which used laser, electrostatic, or mechanical gyroscopes, as well as old-fashioned manual tools like maps and compasses. So why were US surveyors heading off into the Saudi desert?

The surveyors were from the 30th Engineers Battalion (Topographic), which was deployed to provide map production and distribution, surveying, and terrain analysis services to the theatre. The survey platoon’s work was being done on behalf of the Corps and divisional artillery, which had their own particular navigational needs. Unlike fighter or helicopter pilots, field artillery gunners didn’t have the opportunity to see their targets and make last-minute adjustments to their own aim. Unlike bomber crews or cruise missiles, their fire missions were not planned well in advance using specialized materials. To provide precise positioning information to the guns, each artillery battalion in the Gulf was equipped with two Position and Azimuth Determining Systems (PADS), truck-mounted inertial navigation systems that keep an ongoing track of the unit’s positions. At the heart of the PADS was the standard US Navy inertial navigation system, the AN/ASN-92 Carrier Inertial Navigation System (CAINS).

Like all inertial navigation systems, PADS had a tendency to drift over time. That meant that it required regular refreshes using a pre-surveyed location, or control point. The initial specifications for PADS were to achieve a horizontal position accuracy of 20 meters over 6 hours and 220 kilometers. Actual horizontal accuracy seems to have been far better, more like 5 meters. One reason for the high accuracy was that, unlike an airplane, the vehicle carrying the PADS could come to a complete stop, during which the system detect and compensate for some of the errors by the accelerometers in the horizontal plane.

Unfortunately, the US had exactly one control point in Saudi Arabia, at Dharan airbase (Army Reserve historian John Brinkerhoff says this and several other point surveyed were done with “Doppler based methods.” I assume that means using the TRANSIT satellite system, which determined location on the basis of Doppler shift). Starting from that control point, the 30th’s surveyors extended a network of new control points northwards and westwards towards the Iraqi border. Conventional line-of-sight survey methods would have been too slow, but the surveyors had received four GPS receivers in 1989 and soon got more from the Engineer Topographic Laboratories to equip a follow-up team of surveyors. Eventually, their survey covered 10,000 square kilometers and included 95 control points. Relative GPS positioning took about two hours (according to Brinkerhoff) and offered accuracy to about 10 centimerers (compared to 17 meters for regular GPS use). Absolute positioning – done more rarely – required four hours of data collection and provided accuracy of 1–5 meters.

When the ground war began on 24 February 1991, the two survey teams tried to stay ahead of the artillery, which meant driving unescorted into the desert and marking new control points with steel pickets with reflectors (for daytime) and blinking lights (for night-time). Providing location data through headquarters was too slow, so the surveyors took to handing it directly to the artillery’s own surveyors or just tacking it to the pickets. By the ceasefire on March 1 they had surveyed all the way to 30 km west of Basra. Where the artillery outran the control points they used their own GPS receivers to make a “good enough” control point and reinitialized the battalion PADS there, so all the artillery batteries would at least share a common datum. One thing PADS could do and GPS couldn’t was provide directional information (azimuth), so units that outran their PADS capabilities had to use celestial observations or magnetic compasses to determine direction.

What the 30th Battalion and the artillery’s surveyors did in the Gulf was different enough from traditional survey methods that the some in the army already used a different phrase, “point positioning,” to describe it. In the 1968–1978 history for the Engineer Topographic Laboratories, which designed army surveying equipment, PADS was one of three surveying and land navigation instruments singled out as part of this new paradigm (the others were a a light gyroscope theodolite with the acronym SIAGL and the Analytical Photogrammetric Positioning System).

Brinkerhoff tells the story of the 30th’s surveyors as the meeting of the high and low tech, but the work really relied on a whole range of technology. Most of the GPS surveying was relative positioning that was anchored to previous Doppler surveying. Position and azimuth information was carried forward by inertial navigation, and the position of the firing battery was paired with target information from a forward observer equipped with GPS, an inertial navigation system, or a paper map or from aerial photography which could be interpreted using the aeroplane’s own navigation system or a photointerpreter’s tool like APPS. GPS surveying and navigation did not stay wrapped up with all these other navigational tools for long. The technology was flexible enough to be used in place of many of them. But in the early 1990s, GPS’s success was contingent on these other systems too.

Sources Notes: The story of the 30th and its surveyors appears in John Brinkerhoff’s monograph United States Army Reserve in Operation Desert Storm. Engineer Support at Echelons Above Corps: The 416th Engineer Command (printed in 1992). Further details appear in the Army Corps of Engineers history Supporting the Troops: The U.S. Army Corps of Engineers in the Persian Gulf War (1996) by Janet A. McDonnell and “The Topographic Challenge of DESERT SHIELD and DESERT STORM” by Edward J. Wright in the March 1992 issue of Military Review. Reflections on how the artillery used PADS and GPS in the Gulf come from the October 1991 issue of Field Artillery, a special issue on “Redlegs in the Gulf.” Technical details for PADS are from the ETL History Update, 1968–1978 by Edward C. Ezell (1979).

A Tale of Two Keystone States

An auxiliary crane ship, the SS Cornhusker State, in 2009. US Navy by Petty Officer 1st Class Brian Goy. DIVIDS Photo ID 185724.

In the later years of the Cold War, the US Navy recognized the need to revitalize its seagoing transport capacity. During the Second World War, the military had built a massive fleet to support transatlantic and transpacific campaigns. Mothballed after the war, much of it had rotted away by the time reconstruction began under presidents Nixon and Carter and accelerated under President Reagan. One necessity for the new fleet was equipment to move cargo – especially containers – from ship to shore. After experiments with lifting by helicopter or balloon, the Navy settled on fitting a series of cargo ships with heavy cranes to unload cargo in ports that lacked the necessary infrastructure. The first ship to be converted was the SS President Harrison, previously operated by American President Lines, which was renamed the SS Keystone State (T-ACS-1) upon completion of its refit in 1984.

The Barge Derrick Keystone State (BD-6801) being towed by two Army Small Tugs during an exercise at Joint Base Langley-Eustis, Va., Aug 6, 2013. (U.S. Army photo by Spc. Cal Turner/Released) DIVIDS ID 990511.

Confusingly, the T-ACS-1 is not the only US military crane watercraft named the Keystone State. In 1998, the US Army launched a engine-less crane barge BD-6801 with the same name, chosen to honor the 28 soldiers from Pennsylvania’s 14th Quartermaster Detachment killed in a SCUD attack during the first Gulf War (in this instance, BD stands for Barge Derrick). Operated by the Transportation Corps, the BD-6801 was built to help unload military cargo in any of the many ports around the world unequipped to handle the cargo. It carries a single crane with a reach of 175 feet and a lift capacity of 115 long tons which, unlike the cranes on previous army barges, is able to lift a 60 ton M1 tank off of a cargo ship.

Between 1985 to 2005, at least one Army floating crane like the Keystone State was always aboard the MV American Cormorant, a float-on/float-on (FLO/FLO) heavy lift ship at Diego Garcia that carried a package of Army watercraft for operating a damaged or unequipped port. The American Cormorant and its cargo deployed to many major crises as part of the army response, including the first Gulf War and Operation RESTORE HOPE in Somalia. Until the launch of the Keystone State, the crane barge carried aboard the American Cormorant was one from the BD-89T class, with an 100 foot reach and an 89 long ton (100 short ton) capacity.

The American Cormorant en route to the Gulf. Note the two BD-89T cranes on-board, only one of which was used in operations. From Operations Desert Shield and Desert Storm: The Logistics Perspective (Association of the United States Army Institute of Land Warfare, 1991), p.12. Courtesy of the AUSA website.

It was a BD-89T barge, the Algiers (BD-6072), which was deployed to be used by the Army 10th Transportation Battalion (Terminal) during the Gulf War. In addition to performing more than 1,500 lifts in Saudi ports, the Algiers was used to help clear damaged Kuwaiti ports of obstructions – harbor clearance being a mission shared between the US Army and Navy. After having built-up an extensive salvage force after the Second World War, changes to salvage doctrine meant the US Navy only sent one salvage ship and no heavy-lift gear to the Gulf. Commercial salvors being paid by the Dutch government took up much of the slack, but there were limits to what the contractors could do. With rental fees for barges and cranes running as much as $150,000 a day for a 600 ton Ringer crane barge, the Americans ended up mostly going without the heaviest equipment. The biggest harbor clearing lift involving the Algiers was a sunken Iraqi Osa II missile boat in the Kuwaiti port of Ash Shuaybah. Though small by seagoing standards, the Osa II was 127 feet long and displaced almost 200 tons in standard load. Even in combination with a quayside 140 ton crane, the crane barge couldn’t lift the ship whole. Only after army divers cut off the still-life missile launchers could the boat be raised. Looking back at the operation in the navy after-action report, perhaps with a little bit of envy, one of the navy salvage engineers called the army crane “very workable.” Other sunken craft the divers lifted at Ash Shuaybah, with or without the help of the crane, included a 90 foot sludge barge and two other boats.

The deployment of the Algiers during the first Gulf War is only the tip of the iceberg when it comes to the military roles played by American floating cranes, which since the conversion of the battleship Kearsage into Crane Ship No. 1 have worked to construct warships, salvage sunken submarines, and clear wrecks from the Suez Canal.

Source Notes: Much of the information for this post came from various sources around the internet, and in particular the website for the US Army Transportation Corps’ history office. The Corps’ 1994 official history, Spearhead of Logistics, was also useful. Details on the salvage operations during the Gulf War came mostly from the two-volume US Navy Salvage Report: Operations Desert Shield/Desert Storm, printed in 1992 and available online at the Government Attic (volumes one and two); the report’s chronology was the only place I was able to find which US Army crane barge was actually operated during the war.

The Great Cat and Dog Massacre

On September 3, 1939 the United Kingdom declared war on Germany. The population of Great Britain quickly prepared for the bombing raids they expected to receive. They strung up blackout curtains, built bomb shelters, and dug trenches. Many also killed or had their pets killed, with an estimated death toll in London alone of 400,000–700,000. That’s roughly 26% of the prewar population of companion animals. Those who had their pets euthanized did so against the advice of the veterinary profession, animal welfare charities, and even the government-sponsored National Air Raid Precautions Animals’ Comittee (NARPAC). Though the British government already had an ambivalent relationship with pets before, even it had not foreseen mass preemptive killing before the first bombs had fallen. In a sense, these animals were the first casualties of Britain’s war.

It is these September killings which give Hilda Kean’s new book, The Great Cat and Dog Massacre, its title. The phrase is a play on the title of a famous essay by historian Robert Darnton on the symbolic significance of pets in early modern France and a pointer towards how Kean frames her topic. Positioning the book as a contribution to the burgeoning field of Animal Studies, Kean indicates that she is less interested in symbolism and more interested in the two-way connection between pets and their people during the war. More than that, her aim is to bring animals back from the periphery of the story, where they exist as adjuncts to how humans conceive themselves, and to put them center stage as historical actors in their own right.

For those who survived the September crisis, Kean argues, rationing, air raids, and privation brought companion animals and their masters closers together in wartime than they had been in peace – and this despite ambivalent government policy that rarely saw non-working animals as anything other than idle mouths or nuisances.

Despite Kean’s impressive research into official and unofficial sources that shed light on human-companion animal relations – government papers, personal diaries, oral histories, advertisements, and the archives of Mass Observation – its remains challenging to write an animal-centric account of these wartime moments. Still, Kean has more than enough to offer a fresh perspective on the British Home Front. That includes the lives of  the official and unofficial cat inhabitants of the prime minister’s residence at 10 Downing Street. The former was “Treasury Bill,” aka “The Munich Mouser,” a rat-catcher. The latter was “Nelson,” who served at least some of the time as Winston Churchill’s foot-warmer. Their lives, at the heart of the British war machine, are good examples of how the Second World War in Britain was more than just a “People’s War.”

Trawling for Spies

A new article in Intelligence and National Security by Stephen G. Craft reveals how the Office of Naval Intelligence (ONI) ran a counterintelligence program using fishermen along the southern Atlantic seaboard during the Second World War. Expecting that the Axis would land agents on US shores (something that happened, but only rarely) and use German and Italian-American fishermen to support U-boat operations (which seems to have happened not at all), ONI created Selected Masters & Informants (SMI) sections under naval district intelligence officers to recruit fishermen as confidential informants. Their operations caught no spies but offered some comfort that subversion was never rampant along the coast.

For fifty years from 1916 to 1966, the district intelligence officers were ONI’s contribution to local counterintelligence, security, and information-gathering in US coastal areas. The official responsibilities of the district intelligence officer were numerous. According to Wyman Packard’s A Century of U.S. Naval Intelligence they included:

maintenance of press relations for district headquarters; liaison with the investigating units of federal, state, and city agencies within the naval district; liaison with public and private research agencies and with business interests having information in intelligence fields; liaison with ONI and the intelligence services of the other naval districts, and with forces afloat within the district; counterespionage, security, and investigations; collection, evaluation, and recording of information regarding persons or organizations of value (or opposed) to the Navy; preparation and maintenance of intelligence plans for war; and administrative supervision over the recruiting, training, and activities of the appropriate personnel of the Naval Reserve within the district.

The position was only eliminated in 1966, when its investigative and counterintelligence duties passed to the Naval Investigative Service, its intelligence-collection duties to local Naval Field Operational Support Groups, and its other sundry tasks to the district staff intelligence officer.

Admiral Ingersoll, Commander-in-Chief, Atlantic Fleet, and Rear Admiral James at Charleston, South Carolina during an inspection of the Sixth Naval District, 23 November 1943. Courtesy of Mrs. Arthur C. Nagle. Collection of the Naval History and Heritage Command, NH 90955.

In October 1942, the creation of SMI sections added recruiting fishermen as counterintelligence agents to the long list of task mentioned above. By January 1943, the SMI sections had recruited 586 agents, 200 of them in the Sixth Naval District (headquartered in Charleston, South Carolina). Ship owners were paid $50 to cover installation of a radiotelephone, which were provided to about 50 craft. Otherwise masters were to report by carrier pigeon (the Navy operated lofts in Mayport, Florida and St Simon’s Island, Georgia) or by collect call once ashore. Some masters also received nautical charts that were overprinted with a confidential Navy grid for reporting purposes.

Shrimp fleet in harbor, St. Augustine, St. Johns County, Florida, 1936 or 1937. Photograph by Frances Benjamin Johnston. Retrieved from the Library of Congress, (Accessed April 20, 2017.)

The absence of winter shrimp fishing, a tendency to cluster in good fishing spots, and the total absence of enemy covert activity all combined to limit the program’s impact. Further south in the Seventh District (headquartered in Jacksonville and Miami, Florida), most fishing was done so close to shore that the district did not bother to implement the program. In a few cases fishing boats were attacked by U-boat and two confidential observers were reportedly killed in submarine attacks. Though the program operated until V-J Day, few reports of interest were ever received. Similar operations took place elsewhere in the US as well, with scattered references in Packard’s Century of U.S. Naval Intelligence to fishing vessels as observers in other naval districts too.

Shrimp boats were the basis for both overt and covert surveillance. Navy patrol craft like the YP-487 were known as “Shrimpers” because of their origins as commercial fishing boats. Collection of the Navy History and Heritage Command, NH 106994.

How successful you consider the program will depend on how plausible you consider the Navy’s fear of subversion and agent landings. However, the idea of using commercial seafarers as observers and informants clearly proved itself enough to resurface from time to time after the war. In 1947, the Chief of Naval Operations issued a letter authorizing the placing of informants on US merchant ships to detect any crew members involved in subversive activities (this was known as the Special Observer–Merchant Marine Plan). In 1955, merchant ships and fishing vessels were included in plans to collect “merchant intelligence” (MERINT) on sightings of ships, submarines, and aircraft (both efforts referenced in Packard). Did the use of fishermen for counterintelligence continue into the 1960s or beyond? If so, there might have been agents on the boats involved in joint US–Soviet fishing enterprises of the 1980s, carefully watching the Soviets carefully watch the Americans.

Excluded Computers: Marie Hicks’s Programmed Inequality

It should be no surprise, fifty to seventy years after the fact, that the introduction of electronic computers in government and industry reflected societal prejudices on women’s employment in the workforce. Books released last year about female computers at the Jet Propulsion Laboratory and NASA Langley narrated the discrimination and exclusion of those women, whose jobs reflected the messy transition from human to automated calculation in large-scale engineering (both are jointly reviewed, along with Dava Sobel’s book on an earlier generation of female computers, in the New York Review of Books here)

The number of women involved in each of these endeavors were dwarfed, though, by the female workforce of the British civil service that’s discussed in Marie Hicks’s excellent Programmed Inequality: How Britain Discarded Women Technologists and Lost Its Edge in Computing. The Civil Service was large enough to document its decisions in painstaking detail and confident enough not to mince words in its internal papers, which makes Hicks’ book a cringeworthy account of the open, blatant, self-satisfied gender discrimination that accompanied the spread of electro-mechanical and then electronic data processing in the British government.

Hicks describes how, from the late 1940s all the way to the 1970s, the civil service took a pool of machine workers that was mostly female and deliberately and repeatedly hemmed them into job categories where their wages could be kept low and their promotion opportunities (which would mean raises) constrained, at the same time as it relied on their technical skills, practical knowledge, and commitment to keep the government running. Separate pay scales for women, eliminated in 1955, were replaced by a series of “excluded grades,” including machine workers, where pay rates would be lowered to the old women’s rate rather than raised the existing men’s rate. When the growth of automated data processing made the need for more senior professional and managerial positions obvious, the service recruited men for those positions – even when it meant starting them with no computer experience – rather than take the traumatic step of letting female staff from the machine operator grades manage men and be compensated at executive-level pay scales. Perhaps unsurprisingly, the government then found it hard to retain those men, with many taking their new skills into private industry or moving back out of computing to other areas in government.

As Hicks explains it, how the the civil service managed its workforce was not only immoral and inefficient but also terrible for the long-term health of the British computer industry. While segregating away the female computing workforce kept costs low, it also hamstrung modernization. By the time the government realized its need for programmers, most of the people with those skills, being women, could not actually be classed as “programmers,” since that job was conceptualized as higher-status and therefore reserved for men. That led the government to prioritize mainframe designs that could be run with a small expert staff, since retaining skilled male programmers was hard and female machine operators with no promotion opportunities were per se unreliable. Following that decision, made by the leading purchaser of British computers, led the companies that built British computers down a blind-alley in design at just the time that microelectronics were putting more computers on more desks and sparking a revolution in the American computer industry.

The blind alley. The International Computers Limited (ICL) 2966 was one of the last mainframe series to be designed in the UK. This machine is at the National Museum of Computing in Bletchley Park, though it’s so large that only about half is on display. Photograph by Steve Parker, CC-BY-2.0, from flickr as of April 4, 2017.