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Military Graphometer and Protractor, French?, 17th Century?

preview image for Military Graphometer and Protractor, French?, 17th Century?
Object is on display.
Inventory Number: 47382
Object Type:
Place Created: France Europe
Subject Classification(s): Billmeir Collection   
Accession Number: 1957-84/258
Brief Description: Open semicircle with degree (0 to 180) and polygonal (3 to 24) scales, diametric bar with linear scale (0 to 200), pair of elaborate sights adjustable over vertical scales, shaped and decorated pivoted alidade with similar scale, pivot arranged to leave the central point of the semicircle free, one similar sight (one missing). Mechanical subdivision of the degree scale, its motion moving a blued steed index over a subsiduary scale on a moving disc..
Provenance: Presented by J. A. Billmeir.
Collection Group:
Material(s): Gilt brass and steel


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