~ A FINE WILLIS PATENTED PLANIMETER by ROBERTSON, NY~

~ A FINE WILLIS PATENTED PLANIMETER by ROBERTSON, NY~

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A rarely used Willis planimeter made by Robertson c.1903

Dimensions

10 x 4 x 2 inches

Circa

1903

Maker

Willis/Robertson

Country of manufacture

North America

Categories: Navigational instruments, Calculating, Drawing Instruments, Scales Weights & Measures, Engineering antiques, Office Antiques

Description

A fine and cased Willis-type planimeter with rotating boxwood scales, blued steel slide for rotor, nickel/chrome arms capable of measuring 45 sq. in. at a time, instructions for use, original inspection tag, dated and serialized. Patent dates on axis/pivot point. Rarely used and in it’s original brown card case measuring 26 x 11 x 4 cm. (~10 x 4 x 2 inches). Sold for $20 then ($750 today).

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Dealer information

CA Scientifica Opticae Inc.

Scientifica Opticae

Mark Hacking (Scientifica Opticae Inc.) has been an avid collector/dealer for over 40 years. A former Science teacher, he has an innate love for anything natural or mechanical. Specializing in optical (microscopes, telescopes), surveying, medical, weighing and drawing instruments, he is an active participant of the Scientific Instrument Fair in London. Living in Stratford, Ontario, Canada, with his wife and two children; Mark looks forward to meeting as many fellow collectors as possible, and has a worldwide following on eBay (Sciopti). As of Nov. 1/24 my email has changed to either [email protected] or [email protected].

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