A Halden Calculex

maker:: Joseph Halden

A Halden Calculex, and a tachometer.

"Calculex" Circular Slide Rule

1908

Carborundum speedometer

1940

Details

Category:: Weighing & Measuring

Object Number:: Y1981.20

type:: collection of two measuring instruments

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A Halden Calculex

"Calculex" Circular Slide Rule

Carborundum speedometer

Details

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