![]() One in my collection had been re- packaged (in polythene) in December 1976. It remained in service long enough to acquire a NATO number W10 6675- 99- 445- 2112. The scales on one side, from top to bottom are: yards 1 inch = 1 mile yards 1/4 inch = 1 mile miles 1/4 inch = 1 mile yards 1:20,000 metres 1/4 inch = 1 mile metres 1 inch = 1 mile. Protractors Science & Mathematics date made ca 1900 ID Number 1986.0662.01 accession number 1986.0662 catalog number 1986.0662.01 Description This circular German silver protractor is divided to quarter-degrees and marked by tens from 0° to 350° in the clockwise direction and from 10° to 360° in the counterclockwise direction. The last ones made, including those made by Blundell Rules Ltd, were made of un- reinforced PVC and renamed Protractor Rectangular 6” Opaque ‘A’ Mk 4. Later ivorine ones were not reinforced and the one pictured above is one of those. Professional 360 protractor is made from pure clear acrylic to ensure long life. The earliest ones were reinforced in the ivorine with metal mesh and carried the patent number 361012/30 so it presumably replaced the AIII about 1930. How do you measure a circular protractor To measure an angle ABC, we place the mid point of the protractor on the vertex O of the angle. CIRCULAR PROTRACTOR 130mm ESP FRA ENG CZE CIRCULAR PROTRACTOR 130mm Foto Related Picture. There is a small hole in the center of the protractor. Later protractors were transparent and semi- circular. As shown below, a protractor is a half or full circle measuring device, marked in degrees along the outer edge, with a straight line running from 0° to 180°. The A Mk IV was the last, special design of British military rectangular protractor. Production-ready 3D Model, with PBR materials, textures, non overlapping UV Layout map provided in the package. Protractor Rectangular 6 inch Ivorine A Mk IV.
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