Gerber Variable Scale, Model TP007100B
date: label: date made
content: ca 1980
name: label: maker
content: Gerber Scientific Instrument Company
notes: label: Description
content: This rectangular aluminum instrument has a scale of reciprocal inches, unevenly divided and labeled R<sub>I</sub>; a scale of equal parts, labeled I and numbered by ones from 1 to 10 and by tens from 15 to 95; and a logarithmic scale labeled L<sub>10</sub>. An aluminum slide on top of the scales has a plastic indicator with a hairline. The slide is attached to a spring that expands and contracts within a clear plastic housing above the scales. It has 103 coils, 100 of which are calibrated. Every tenth coil is colored red, every fifth coil is blue-green, and the rest are white. A second spring is numbered by twos from 0 to 10.
label: Description
content: Below the scales is marked: THE GERBER SCIENTIFIC INSTRUMENT COPMANY HARTFORD, CONN. GERBER VARIABLE SCALE ® MODEL TP007100B U.S. PAT. NO. 2843935 U.K. PAT. NO. 845215 MADE IN U.S.A. A brown leather case is lined with black velvet marked: The Gerber Scientific Instrument Co. (/) Hartford, Connecticut. A small manila envelope inside the case holds an Allen wrench. The case fastens with Velcro and slides into a white cardboard box.
label: Description
content: The instrument assists in replotting curves (if, for example, a user wished to multiply all values plotted by a given factor) and in interpolating contour lines from observed data. It can also be used to convert between proportional scales, for instance when enlarging or reducing an engineering drawing. Heinz Joseph Gerber (1924–1996) invented the device while he was studying aeronautical engineering at Rensselaer Polytechnic Institute in 1945, a few years after escaping Nazi-controlled Austria with his mother. He and a partner established the Gerber Scientific Instrument Company in Hartford, Conn., to manufacture the Gerber Variable Scale. Gerber ultimately held about 650 U.S. and foreign patents for calculating instruments, digital drafting machines, and robotic and electronic manufacturing systems for products from electronics to textiles. The firm was renamed Gerber Scientific, Inc., in 1978.
label: Description
content: Compare to 1994.3104.01. For an instruction manual, see 1994.0113.04.
label: Description
content: References: Arthur Bartlett, "A Quick Spring to Success," <i>Nation's Business</i> (October 1949): 43–45, 62–64; Heinz Joseph Gerber, "Instrument for Measuring, Interpolating, Plotting and the Like" (U.S. Patent 2,843,935 issued July 22, 1958); "Our Founder," Gerber Scientific, http://www.gspinc.com/default.asp?contentID=192.
label: Location
content: Currently not on view
place: label: place made
content: United States: Connecticut, Hartford
topic: label: Subject
content: Mathematics
label: Subject
content: Rule, Calculating
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Science & Mathematics
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content: Scale Rules
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1994.0113.01
label: accession number
content: 1994.0113
label: catalog number
content: 1994.0113.01
objectType: label: Object Name
content: scale in case
physicalDescription: label: Physical Description
content: aluminum (overall material)
label: Physical Description
content: plastic (overall material)
label: Physical Description
content: leather (overall material)
label: Physical Description
content: fabric (overall material)
label: Physical Description
content: cardboard (overall material)
label: Physical Description
content: velcro (overall material)
label: Measurements
content: overall: 3 cm x 33.1 cm x 7.4 cm; 1 3/16 in x 13 1/32 in x 2 29/32 in