Texas Instruments SR-51-II Handheld Electronic Calculator
date: label: date made
content: 1976
name: label: maker
content: Texas Instruments
notes: label: Description
content: This handheld electronic scientific calculator is a modification of the earlier SR-51 and SR-51A. It has a black plastic case with an array of forty small rectangular plastic keys. All but five of these keys have a “dual function”—one function is indicated on the key, the other on the keyboard above the key. This makes it possible to use keys to perform conversions from some common to metric measures, rather than using the system of codes employed on the SR-51. A key also can be used to convert from degrees to radians, something performed by a switch on the SR-51.
label: Description
content: Text above the keys reads: TEXAS INSTRUMENTS SR-51-II. Behind the keyboard is an on/off switch. Behind this is an LED display that shows ten-digit positive and negative numbers and two-digit positive and negative exponents. The jack for a charger/adapter is on the right side of the calculator.
label: Description
content: Text on the back of the calculator (there is no sticker) reads: TEXAS INSTRUMENTS (/) electronic calculator (/) SERIAL NO. (/) 6389263 LTA5076 (/) ASSEMBLED IN USA. An empty battery pack inside the middle of the back is marked: TEXAS INSTRUMENTS (/) ELECTRONIC BATTERY BP-5.
label: Description
content: There are no screws to easily take apart the calculator. The device has a black plastic zippered case.
label: Description
content: References:
label: Description
content: [Advertisement], <I>Boston Globe</I>, September 26, 1976, p. 87. Lists calculator as a new product from Texas Instruments that sells for $67.95.
label: Description
content: [Advertisement], <I>New York Times</I>, March 6, 1977, p. 98. Lists calculator as selling for $54.95.
label: Description
content: [Advertisement], <I>Washington Post</I>, September 14, 1978, p. A19. SR-51-II on sale for $29.95, a $20 savings.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Computers
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content: Computers & Business Machines
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content: Handheld Electronic Calculators
creditLine: label: Credit Line
content: Gift of John B. Priser
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1986.0988.358
label: catalog number
content: 1986.0988.358
label: accession number
content: 1986.0988
objectType: label: Object Name
content: electronic calculator
physicalDescription: label: Physical Description
content: metal (zipper; some circuitry material)
label: Physical Description
content: plastic (case; carrying case; keys material)
label: Measurements
content: overall: 1 1/2 in x 3 in x 5 3/4 in; 3.81 cm x 7.62 cm x 14.605 cm