This Friden Calculator (Jul, 1954)

This Friden Calculator

Extracts Square Root Automatically with a touch of one key (first time on any desk calculator) Also provides all basic features which enable the fully automatic Friden Calculator—The Thinking Machine of American Business—to perform… more kinds of figure-work without operator decisions than any other calculating machine ever developed Send today for this Information Sheet describing features and abilities of the fully automatic Friden Square Root Calculator in detail.

Write FRIDEN CALCULATING MACHINE CO., INC., Dept. SA-3, San Leandro, California.

Friden BUILDS CALCULATORS IN A WIDE PRICE RANGE, IN EVERY SIZE, FOR EVERY FIGURING NEED
Friden sales, instruction and service available throughout the U.S. and the world,

3 comments
  1. Hirudinea says: April 10, 201311:18 am

    If this is the desk top version what does the pocket version look like!? (I know, I know, the pocket version is a slide rule.)

  2. Toronto says: April 10, 20131:41 pm

    Some online resources suggest a square root took on the order of 10 seconds and lots of mechanical movement. (The upper part of the Friden moves back and forth when it’s thinking hard.)

  3. Tim Crow says: February 25, 201411:33 am

    As a teenager I picked up a similar machine at a rummage sale for $2. It was noisy, low, but fascinating to watch it chug through calculations.
    After a year or so it finally jammed up for good.
    I opened it up and was amazed at the complexity of the innards. Hundreds of small gears, rods, springs.
    They must have been hell to service.

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