Null Measuring instrument, England, late 19th century, marked "Philip Harris Ltd…
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Measuring instrument, England, late 19th century, marked "Philip Harris Ltd. Birmingham England" on the dial. Compass needle in a coil? A pair of resistors in the wooden base? On 3 height-adjustable feet, slightly rubbed, h. 24 cm

4799 

Measuring instrument, England, late 19th century, marked "Philip Harris Ltd. Birmingham England" on the dial. Compass needle in a coil? A pair of resistors in the wooden base? On 3 height-adjustable feet, slightly rubbed, h. 24 cm

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