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
>> 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/