||Pupin Hall, Columbia University.
Photo: Frank da Cruz, April 2002
Rutherford observatory has been in continuous operation since Pupin was constructed, but in 2009 a new "Northwest Corner Building" was erected next to it, six floors higher than the roof of Pupin and blocking a significant portion of its field of view, and (when it opens) no doubt also putting out a considerable amount of light, obscuring the remaining open sky. The Astronomy Department, which still exists, is seeking a new home for the instruments. HERE is a link to a Spectator article on the subject, 1 October 2009, for as long as it lasts.
Professor Eckert's Astronomical Computing Bureau stayed behind in Pupin to perform war-related computations, such as ballistic trajectories, while Professor Eckert himself directed the Nautical Almanac office of the US Naval Observatory for the duration of the war. Uranium separation and heavy water production research were carried on in the basement of Pupin, where to this day radioactive equipment such as the cyclotron's 3-ton cobalt-steel electromagnet remains stored in a locked area (other parts were moved to the Smithsonian Institution in 1965 when the cyclotron was shut down). The uranium separation work (development of the gaseous diffusion technique) of Columbia's Special Alloy Materials (SAM) Laboratories [sorry, link defunct] expanded to the Nash Building on West 133rd Street, where radiation detection techniques and instruments were also developed by Columbia physicists C.S. Wu, Bill Havens, and James Rainwater. Meanwhile, the Columbia Radiation Lab occupied Pupin floors 10-12, connected via Professor I.I. Rabi with the MIT Radiation Laboratory and the development of radar for the War .
In early 1945, Professor Eckert's newly established Watson Scientific Computing Laboratory at Columbia University, temporarily housed on Pupin's tenth floor, was given the task of performing temperature-pressure (shockwave) calculations for Los Alamos during the final months of A-bomb design and construction. From Herb Grosch's Computer: Bit Slices from a Life  (2003):
By this time Eckert and I knew that the unit of temperature in my calculations was a million degrees Kelvin, and so on. We kept the equations I was working with, and my translation into computable form (approved, with a warning, by the great Johnnie [von Neumann] on his first visit), and the starting values, in the big safe. What Marjorie [Herrick] and [machine room operator] Cliff and the others saw was a long shelf of 28 IBM plugboards, which when cycled through the various machines produced a messy and unlabelled printout from the 405 tabulator. While I bundled this up and mailed it with my own hands, registered, to von Neumann — later, to [Roy] Marshak — at the anonymous Santa Fe box number, the machine room team began to repeat the cycle. We did two a day; each predicted the temperature and pressure up to the (moving) shock wave after one more time step - a millisecond. Allowing for the fact that we did not work Sundays, that was 50,400,000 times as slow as the real atomic explosion! A Cray 2 today  would be ten million times faster - and give you Saturday off besides! ... The listings I mailed to Los Alamos had no hand-written labels, but matched a labelled master copy that had been carried back by Feynman: primitive but exceedingly effective security. … Then it was August 6, and the radio and the newspapers told us about Hiroshima. We knew what we had been working on, and that tens of thousands of Japanese civilians had been incinerated. Before the moral pressures could mount, events swept us away. The war in the Pacific ended, the war in Europe ended. All our perspectives lengthened overnight — from a few months "to the end of the war," to the long reaches of peace.
The CDC Energy Employees Occupational Illness Compensation Program Facility List includes the following entry:
281 - SAM Laboratories, Columbia UniversityAlso Known As: SAM Laboratories
Also Known As: Special Alloyed Materials Laboratories
Also Known As: Substitute Alloy Materials Laboratories
State: New York Location: New York City
Time Period: 1942-1947
Facility Type: Department of Energy Facility
Description: Columbia University was already researching some of the problems involved in determining whether it was feasible for the United States to build a nuclear weapon prior to the establishment of the Manhattan Engineer District (MED). Once the MED was formed in 1942, Columbia became part of the effort to build the first atomic weapons. At that time, the Columbia effort was reorganized and designated as SAM (Special Alloy Materials or Substitute Alloy Materials) Laboratories. Buildings used as part of the SAM laboratories at Columbia included Pupin, Schermerhorn, Prentiss, Havemeyer and Nash. Work at SAM Laboratories ended in 1947 with the establishment of the AEC. Subsequent work at Columbia University focused on health effects and basic nuclear physics that were not directly related to the production of nuclear weapons
The Nash building is on the east side of Broadway at West 133rd Street, and was rented by Columbia during World War II. For more about Columbia University in World War II, see the 1939-1945 sections of the Columbia University Computing History.
Chien-Shiung Wu and 2021 stamp
|Columbia University Computing History||Frank da Cruz / email@example.com||This page created: January 2001||Last update: 27 March 2021|