The Iowa Engineering Experiment Station Bulletin 166 titled A mechanical device for the solution of equations involving the Laplacian operator, written by Glenn Murphy and John V. Atanasoff, 1949. The bulletin describes the construction and operation of a device called the Laplaciometer.
Letter from John V. Atanasoff to Warren Weaver of the Rockefeller Foundation regarding progress on his computing machine, July 10, 1940. The letter details Atanasoff's advancements on his computing machine as well as a request for assistance from Weaver.
Letter from John V. Atanasoff to R. M. Bowie of the Hygrade Sylvania Corporation regarding the purchase of vacuum tubes, June 19, 1940. The letter discusses an order of vacuum tubes that were shipped as well as the work that is being done on the computing machine.
Letter from John V. Atanasoff to R. M. Bowie of the Hygrade Sylvania Corporation regarding the purchase of vacuum tubes, July 23, 1940. The letter details a request from Atanasoff about vacuum tubes he needs to build his computing machine.
Letter from John V. Atanasoff to N. B. Krim of the Raytheon Production Corporation regarding the purchase of vacuum tubes, May 21, 1941. The letter details the type and number of tubes that Atanasoff needs to complete his computing machine.
Letter from John V. Atanasoff to N. B. Krim of the Raytheon Production Corporation regarding the purchase of vacuum tubes, July 23, 1940. The letter details the number of tubes and the voltage Atanasoff needs to complete his computing machine.
Letter from John V. Atanasoff to R. M. Bowie of the Hygrade Sylvania Corporation regarding the purchase of vacuum tubes, May 21, 1941. The letter details a request from Atanasoff for help in filling the need for vacuum tubes to be used in the construction of his computing machine.
Letter from John V. Atanasoff to R. M. Bowie of the Hygrade Sylvania Corporation regarding the purchase of vacuum tubes, January 4, 1940. The letter details the construction of a computing machine Atanasoff is building with the assistance of Mr. Berry and an inquiry about receiving a better price on vacuum tubes.
Letter from John V. Atanasoff to Sam Legvold of Iowa State College regarding an invention of interlocking blocks, blocks with guiding projections, and blocks with a sloping face, May 5, 1948. The letter details advice from Atanasoff to Legvold on how to ascertain if his idea of combining several types of blocks constitutes a new invention.
Letter from John V. Atanasoff to the Bodine Electric Company regarding the purchase of rotor and stator punchings, October 5, 1940. The letter details a request for a 1/2 stack of rotor and stator punchings for an experimental purpose.
Letter from John V. Atanasoff to R. D. Holt of the Cinch Manufacturing Corporation regarding the purchase of socket plugs, March 13, 1940. The letter details an inquiry into what would be the best type of socket plug to use in conjunction with the vacuum tubes to construct the computing machine.
The handwritten description, sketches, and computations for a seeder designed by John V. Atanasoff. The plans are for a seeder that would slip and not break when it becomes clogged.
Letter from John V. Atanasoff to International Resistance Company regarding the stability of resistors, November 14, 1939. The letter details a request for information on variation in the values of resistors as well as the typical life history.
Letter from John V. Atanasoff letter to Harry A. Ehle of the International Resistance Company regarding the purchase of resistors, January 4, 1940. The letter details a request to acquire 600 resistors to be used in the completion of a machine Atanasoff is building.
Letter from John V. Atanasoff to Irgin Stewart of the Committee on Scientific Aids to Learning regarding the mechanization of mathematical equations and a request for grant money, July 10, 1940. The letter details Atanasoff's idea to mechanize linear algebraic equations by designing a machine that will have a large numerical capacity to increase the tabulation speed. The letter also requests grant money to help in the completion of the computing machine.
