The Curveasy and Electriaid charts

The Curveasy Charts

The Curveasy chart set was copyrighted in 1950 by Earl H Needham [the producer of the Trig-Easy charts, see earlier post] and sold by the Eugene Dietzgen Co. My set, which I believe to be complete, consists of

1.  A wallet

2.  A 64 page manual containing instructions, worked examples, illustrations and tables.

3.  Two 97mm x 85mm charts

American machinist: Volume 102, Issues 5-8 1958.

The Electriaid Charts

The Electriaid chart set was copyrighted in 1948 by Earl H Needham [the producer of the Trig-Easy and Curveasy charts] and sold by the Eugene Dietzgen Co.

The set was described as being designed as reference aids for electrical students and engineers. A complete set appears to consist of four double-sided, pocket size (3 7/8″ by 3 1/2″) dial charts and two cards containing over 120 equations, conversion tables, and constants.

I do not have these charts and the photographs below are not mine.

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2 Comments

Filed under Calculators

2 responses to “The Curveasy and Electriaid charts

  1. Peter Morrison

    I found that set (1799 E) in my Grandfathers garage. Would you be interested in them?

  2. Robert Bethman

    I own the 1799E set. I use them in my Amateur Radio % Electronics Hobbies

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