This is my first Calculator. I bought this Rockwell Scientific Slide Rule Calculator in 1975 at Service Merchandise in Sandy Springs , Georgia (Hammond Square Shopping Center) . I remember in high school the Trig teacher would be writing on the board and call out to me for the answer.

[From the National Museum of American History] This handheld electronic calculator has a tan, black, and brown plastic case with an array of twenty-five sloping plastic keys. These include ten digit keys, a decimal point key, a pi key, four arithmetic function keys, a total key, an exchange key, and two parenthesis keys. The top row of keys includes a clear entry/ clear key, an EE (enter exponent) key, a change sign key, a function key, and an ARC key.

Many of these keys have a different effect if the F or ARC key is pushed. Functions found in this way include inverses, exponents, powers, logarithms, square roots, trigonometric functions, inverse trigonometric functions, conversion from radians to degrees, conversion from degrees to radians, and factorials. The calculator also has memory keys. Behind the keys are a degree/radian switch and an on/off switch. Behind the switches is a twelve-character display that shows results in scientific notation, including eight digits of the result, two digits of the exponent in base ten, and the sign of both the number and the exponent.A mark along the front edge reads: SCIENTIFIC SLIDE RULE 63R. A mark behind the eight-digit fluorescent display reads: Rockwell. A jack for a power cord is on the back edge. A sticker on the back gives operating procedures and reads in part: Rockwell (/) International Microelectronics Product Division (/) Anaheim, CA 92803. Further text reads: Calculator Model 63R (/) Assembled in Mexico (/) U.S. and Foreign Parts.

Rockwell 63R Electronic Slide Rule sn259209

1975 – $99.99

There is no doubt that this was ‘slide rule’ calculator with the label on the front. This classic Rockwell design is a little larger than most. Odd pivoting keys in the normal Rockwell colors. It has an 8+2 digit blue VFD display with a ninth digit (and intervening one) for the minus signs. Display input starts at the left rather than the normal right. This particular specimen was used by a Hughes Aircraft employee and it had an asset tag, meaning the company owned it. It was assembled in Mexico.

Donated to ISRM by Scott Reynolds of Vintage Calculators Inc