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RE: [midatlanticretro] Very cool find!

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  • Evan Koblentz
    Awesome information. Thanks for checking into this, Mike.
    Message 1 of 5 , Aug 3, 2007
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      Awesome information. Thanks for checking into this, Mike.

      > On Fri, 3 Aug 2007, Bill Sudbrink wrote:
      >> Basically, a differential analyzer is a very large slide rule. Some
      >> good
      >> footage of one can be seen in the
      >> science fiction movie "When Worlds Collide".
      > http://www.aps.org/publications/apsnews/200208/history.cfm
      > http://en.wikipedia.org/wiki/Image:KayMcNultyAlyseSnyderSisStumpDifferentialAnalyzer.jpg
      > http://www.library.upenn.edu/exhibits/rbm/mauchly/jwm5.html
      > ...and an excerpt from :
      > http://ftp.arl.mil/~mike/comphist/61ordnance/chap1.html
      > "The Moore School of Electrical Engineering of the University of
      > Pennsylvania had a Bush Differential Analyzer of somewhat larger capacity
      > than the one at Aberdeen Proving Ground. It had fourteen integrating units
      > instead of ten. Therefore the Ordnance Department awarded a contract to
      > the University of Pennsylvania for the utilization of this device. Several
      > additional contracts were later awarded to the University to carry out
      > different phases of the increasingly important role which it was to play
      > in the computation activities of the Ordnance Department during the war.
      > Lt. P. N. Gillon, in his capacity as officer in charge of ballistic
      > computations, conferred frequently with Dean Pender, Professor Brainerd,
      > and their associates at the Moore School in order to effect proper
      > coordination of the computational work at the two localities, Philadelphia
      > and Aberdeen. There was a very talented group at the Moore School under
      > the direction of Professor Brainerd and as a result of Lt. Gillon's
      > discussions with them Assistant Professor Weygand undertook to develop an
      > electronic torque amplifier to replace the mechanical torque amplifiers on
      > the Bush Differential Analyzers. This work was eminently successful and,
      > in addition, photoelectric followers were developed by the Moore School
      > group for both the input and output tables of the analyzer. As a result of
      > these accomplishments the productive capacity of the analyzers at both the
      > Moore School and Aberdeen Proving Ground were enhanced by at least an
      > order of magnitude."
      > Mike Loewen mloewen@...
      > Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/
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