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"Pickett circular slide rule with two cursors. (4.25 in/10.9 cm width) Reverse has additional scale and one cursor." Caption at link

"Pickett circular slide rule with two cursors. (4.25 in/10.9 cm width) Reverse has additional scale and one cursor." Caption at link

The slide rule has a long and distinguished ancestry … from William Oughtred in 1622 to the Apollo missions to the moon ... a span of three and a half centuries … it was used to perform design calculations for virtually all the major structures built on this earth during that long period of our history … an amazing legacy for something so mechanically simple.

The slide rule has a long and distinguished ancestry … from William Oughtred in 1622 to the Apollo missions to the moon ... a span of three and a half centuries … it was used to perform design calculations for virtually all the major structures built on this earth during that long period of our history … an amazing legacy for something so mechanically simple.

Slide-rule widow - why you should persuade your engineer husband to apply for a job at Boeing!

Slide-rule widow - why you should persuade your engineer husband to apply for a job at Boeing!

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