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Super Homemakers’ Guide Super Publications Ltd, Toronto, Canada Ø This single-sided volvelle has helpful hints for all kinds of home problems from dirty diamonds (I hate it when that.

Slide Rule

Slide Rule

Slide Rule

Investment Savings Estimator

Contact Datalizer for samples, pricing and design consultation.

Jumbo Sized Slide Rule  USA  1960's  Originally used as a teaching aid. OH YEAH ! I had one of these, I guess I learned to use it...I passed.  :o)

Jumbo Sized Slide Rule

Jumbo Sized Slide Rule USA Originally used as a teaching aid. I had one of these, I guess I learned to use it.I passed.

Thacher's slide rule

Detail of Edwin Thatcher's 1881 slide rule, which is 57 cm from knob to knob, but "packs a scale over 9 meters long."click thru for more pics & info.

volvelles+08.jpg 736×768 pixel

volvelles+08.jpg 736×768 pixel

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