Instrument - Allbrit Planimeter, 20th Century

Physical description

Adjustable Allbrit planimeter calibrated for imperial units. Assembled to use with the magnifier which can be rotated. There is a checking bar. One revolution = 10 sq inches. Accessory box covered in leatherette with blue velvet padding.

Inscriptions & markings

Inside the box (insert): 'SCALE / VERNIER POSITION ON TRACER BAR / AREA OF ONE REVOLUTION OF THE MEASURING WHEEL SCALE / ACTUAL / CONSTANT / SCALE

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