5907RE: [midatlanticretro] Very cool find!
- Aug 3, 2007On Fri, 3 Aug 2007, Bill Sudbrink wrote:
> Basically, a differential analyzer is a very large slide rule. Some goodhttp://www.aps.org/publications/apsnews/200208/history.cfm
> footage of one can be seen in the
> science fiction movie "When Worlds Collide".
...and an excerpt from :
"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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