APF Mark 55 Handheld Electronic Calculator
date: label: date made
content: ca 1976
name: label: maker
content: APF Electronics
notes: label: Description
content: This handheld electronic calculator is designed for scientific work. It has an array of digit keys with a decimal point key, keys for the four arithmetic functions, a sign change key, a reverse x and y key, a down key, an ENT key, and an EE key. At the top are shift, recall, standard deviation, natural log, and clear display keys. Below these are sine, cosine, tangent, summation, and power keys. The function keys all can assume a second function, allowing for evaluation of hyperbolic trigonometric function, decimal logarithms, mean values, square roots, and so forth. A few keys are devoted to converting decimal and standard units of weight and measure—centigrade and Fahrenheit temperatures, liters and gallons, centimeters and inches, and kilograms and pounds.
label: Description
content: The ten-digit LED display is behind the keyboard. The device has space for a nickel/cadmium battery behind this, as well as an outlet for an adapter/charger.
label: Description
content: A mark above the keyboard, even with the on/off switch, reads: aPF MARK 55. A mark on the sticker on the back of the case reads: aPF mark 55 (/) ADVANCED SCIENTIFIC CALCULATOR. After brief operating instructions, futher marks read: MARK 55 (/) Model No.; J-036646 (/) Serial No.; and: APF ELECTRONICS INC. (/) NEW YORK, N.Y. 10022 (/) MADE IN JAPAN.
label: Description
content: A March, 1976, advertisement compared the features of the APF Mark 55 with those of the HP-45, noting that both calculators used reverse Polish notation for data entry, carried out a wide array of operations, and could store and recall nine registers of numbers. According to the advertisement, the HP-45 cost $195 while the APG Mark 55 cost only $79.95.
label: Description
content: References:
label: Description
content: <I>Los Angeles Times</I>, March 14, 1976, p. V57.
label: Description
content: <I>Los Angeles Times</I>, June 8, 1976, p. 9.
label: Location
content: Currently not on view
place: label: place made
content: Japan
setName: label: See more items in
content: Medicine and Science: Computers
label: See more items in
content: Computers & Business Machines
label: See more items in
content: Trigonometry
label: See more items in
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: 1986.0988.171
label: catalog number
content: 1986.0988.171
label: accession number
content: 1986.0988
objectType: label: Object Name
content: electronic calculator
label: Other Terms
content: electronic calculator; Handheld
physicalDescription: label: Physical Description
content: plastic (case; keys material)
label: Physical Description
content: aluminum (keyboard material)
label: Physical Description
content: paper (sticker material)
label: Physical Description
content: rubber (feet material)
label: Measurements
content: overall: 1 in x 3 in x 6 3/8 in; 2.54 cm x 7.62 cm x 16.1925 cm