Gerber TP007200B Variable Scale

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Country of manufacture: USA,            Date of manufacture: ____,      Serial No.: 107363
Overall length: 56.5 cm,          Width: 3.5 cm,           Thickness: 1.3 cm           Weight: 212.5 gms.
Materials & Construction: Black aluminum rectangle, to which two aluminum strips, also black, are screwed. Two scales R_I, and R_F are printed on the bottom strip. The aluminum blocks at either ends of the main assemby (rectangle and two strips) are unpainted, as are the L-shaped runner which moves to left and right along the groove between the two black strips. A rectangular piece of clear plastic with a vertical indicating line is screwed to the bottom of the runner, so that it sits directly over the scales. A triangular spring streches between the left end block and the top of the runner. Every fifth coil is painted green or red, in an alternating pattern. (Description taken and modified from the TP007100B entry listing in the Harvard Collection of Historical Scientific Instruments, here.
Scales: 2
R_I Values 100-10
R_F Values 1200-120
Condition: C5 (Normal signs of use; but index disks have fallen off the cylindrical spring)
Came with: Brown leather covered case

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