Antique Measuring Instrument Collection - Army and Navy C.S.L. Opisometer

Bookmark this page Army and Navy C.S.L. Opisometer

  • Maker: Army & Navy Co-operative Society Ltd
  • Date: c1880
  • Description and Notes:

    This opisometer is made/distributed by the Army & Navy Co-operative Society Ltd (C. S. L), a company established in 1871 by a group of British army and navy officers. Although the basic principle of operation is the same, this is an improved version of the simple Elliott opisometer also in this collection. The circumference of the tracking wheel is three inches and is divided into tenths of an inch, as engraved on the outer side of which. The wheel is constrained to rotate about a fixed point and it is screwed on a threaded rod which has a pointer fixed on one end and constrained by a slot, so when the wheel rotates the pointer will slide along the indexed slot to indicate the actual length that the wheel traveled. Therefore it saves the trouble of to run the device backwardly along a scale rule once the tracking is done to obtain the length. The metal parts of this opisometer are made of German silver and steel, the handle is of ivory. It comes with the original leather covered wooden case.

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