Gerber Derivimeter
date: label: date made
content: ca 1957
name: label: maker
content: Gerber Scientific Instrument Co.
notes: label: Description
content: This instrument has a black plastic base with two clear plastic or glass discs inset in the center. The lower disc has a grid of lines marked on it. The upper disc, and the mechanism attached to it, rotate. An aluminum ring with a scale on it is held in place around the edge of the top disc by four screws. Between the discs is a short, flexible metal rod, shaped into different forms by four other rods whose position may be adjusted. Extending perpendicularly to the flexible rod is a pointer that lies on a diameter of the disc and has its other end at the scale. The reading of the scale indicates the derivative of the curve formed by the rod, in the units of the coordinate system of the grid of lines on the lower disc.
label: Description
content: A mark at the top of the base reads: GERBER DERIVIMETER (/) SLOPE READER. A mark at the bottom of the front reads: THE GERBER SCIENTIFIC INSTRUMENT CO HARTFORD CONN, (/) MODEL D-2. Another mark reads: U.S. PAT. NO. 2791836 MADE IN U.S.A. The patent was issued to H.J. Gerber of Hartford in May 14, 1957. He had applied for it in 1955.
label: Description
content: A paper envelope containing an extra flexible rod is in the brown, cloth-lined case.
label: Location
content: Currently not on view
place: label: place made
content: United States: Connecticut, Hartford
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1994.0113.03
label: catalog number
content: 1994.0113.03
label: accession number
content: 1994.0113
objectType: label: Object Name
content: derivimeter in case
physicalDescription: label: Measurements
content: overall: 3.3 cm x 12 cm x 13.5 cm; 1 5/16 in x 4 23/32 in x 5 5/16 in