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High Voltage Lab film density rule

Major collection: Science & Technology
Object type: slide rule
Maker: Place made: United States, Massachusetts, Cambridge, MIT, High Voltage Lab
Date made: 1943-10-20
Measurements: 1/2 in x 10 1/4 in x 1 1/4 in
Nomenclature: data processing tools and equipment - slide rules
Classification: tools and equipment

Wooden slide rule, painted white, marked with scales: Exposure time in seconds for a density of 1.0 above fog density on e.k. type A X-ray film [Steel thickness-inches, Relative speed, Type A Film total density, Target-film distance in inches, material] tube current in microamperes, equivalent steel thickness-inches. Labelled on front "2.0 Million Volts D. C. // High Voltage LAb, Bldg. 46 // Mass. Institute of Technology." On reverse: Instructions for use, development time/temperature chart for Kodak film. In black cardboard box.


Gift of Mrs. William W. Buechner