Sharp EL-500 Handheld Electronic Calculator

Description
This handheld electronic calculator has a plastic case and thirty-five rectangular plastic keys. The four lower rows of keys are similar to those found on many calculators, with ten digit keys, a change sign key, a decimal point key, four arithmetic function keys, three memory keys, and a total key. The next row up on the scientific calculator contains keys for various forms of exponents and logarithms, as well as a pi key. The next row up (just below the top row of keys) contains a key for converting from degrees, minutes, and seconds to decimal degrees, as well as keys for trigonometric and inverse trigonometric functions. The top row of keys includes keys for powers, reciprocals, square roots, clear entry, and clear. A mark above the keyboard reads: SHARP.
Behind the keyboard is a green fluorescent display that shows the result, up to a six-digit mantissa and a two-digit exponent (as a power of ten). Text above the display reads: SHARP ELSI MATE (/) EL-500. A jack for a power adapter is along the back edge. The on/off switch is on the left side.
The back of the calculator has a compartment for two slim batteries. A sticker inside it reads: 72406257.Text below this reads in part: ELECTRONIC CALCULATOR (/) EL-500. It also reads in part: SHARP CORPORATION (/) MADE IN JAPAN BM.
References:
[Advertisement], Los Angeles Times, March 27, 1977, p. X1. On sale for $14.95
[Advertisement], Washington Post, January 20, 1978, p. A23. Calculator selling for $14.77.
A copy for the manual for this calculator, without the cover, is online at wass.net/manuals, accessed October 27, 2014.
Location
Currently not on view
date made
1977-1978
maker
Sharp Corporation
place made
Japan
Physical Description
plastic (case; keys; display cover material)
metal (circuitry metalmaterial)
Measurements
overall: 1 in x 3 1/8 in x 5 3/8 in; 2.54 cm x 7.9375 cm x 13.6525 cm
ID Number
1986.0988.138
catalog number
1986.0988.138
accession number
1986.0988
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center

Comments

I, too, use this device on at least a weekly basis; a really excellent piece of gear.
I bought this calculator in June of 1959 to use on my first job after graduation from Miss. State Univ. at Western Electric Co. I still have the calaulator and it still works fine.
I received this calculator as a graduation gift in 1979. I still have, and use it every day at work.

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