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Object Name: IBM ASCC-Mark I model 5 single coil
Date: circa 1944
Inventory Number: 1997-1-0237
Classification: Computer Part
User: Harvard Computation Laboratory
founded 1944
Maker: Howard H. Aiken
1900 - 1973
Maker: Benjamin M. Durfee
1897 - 1980
Maker: Frank E. Hamilton
1898 - 1972
Maker: Clair D. Lake
1888 - 1958
User: Grace Murray Hopper
1906 - 1992
User: Richard M. Bloch
1922 - 2000
User: Robert V. D. Campbell
born 1916
Cultural Region: United States
City of Origin: Endicott
Dimensions: 6.4 x 8.8 x 6.9 cm (2 1/2 x 3 7/16 x 2 11/16 in.)
Materials: cloth, wire, metal, plastic
Description: Single coil, wrapped in a black tape. Coil is held within a metal frame. It is mounted on a black base consisting of a stack of insulating material. There is a series of silver pegs on either side of the coil. Black cords extend out of the coil on the left and right, and are attached to two screws on the base in front.

The underside of the base is cut away and covered with a clear plastic window. A label glued to the underside reads:

SAE 10/10
10,000T - 3100 [ohms]
Signed: unsigned
Historical Attributes: Probably part of the IBM Automatic Sequence Controlled Calculator, commonly known as the Harvard MARK I.

According to a brochure published by IBM in 1945:
"The IBM Automatic Sequence Controlled Calculator, an algebraic mechanism employing a unique automatic sequence control, is designed to solve, rapidly and accurately, practically any known problem in applied mathematics."

A detailed description of the history of MARK I, as well as how it works, can be found on the following website.
Curatorial Remarks: From tag: Model 5 Single Coil
Provenance: On March 13, 1997, the following instrument was picked up from the Howard H. Aiken computation Laboratory, 33 Oxford Street. The instrument was transferred to the Collection by Edward P. Jackson, Facilities Manager in the Division of Engineering and Applied Sciences. The following instruments were on exhibition in the entrance area adjacent to IBM Mark I computer on the first floor of the Science Centre, Harvard University.
Published References: Online exhibit about the ASCC produced by the IBM corporate archives.
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