The I.B.M. Pluggable Sequence Relay Calculator. In: Mathematical Tables and Other Aids to Computation, Volume III, Number 23 (June, 1948), pp. 149-161.

A description of the special-purpose wartime punched-card calculators originally developed by IBM for the United States Army. Library rubberstamp on front wrapper. Very good. The complete issue, in original printed wrappers. Octavo. Item #12080

The first two machines of this type, were built during the war for the Aberdeen proving ground, were delivered in December 1944, and were in operation during the last eight months of the war…For comparison with the I.B.M. Sequence Controlled Calculator at Harvard this machine is limited in internal storage capacity, number of significant figures, and flexibility of sequencing; on the other hand, multiplying speed is about twenty times as great.”.

Hook and Norman, 579.

Price: $450.00

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