Multifaceted prism exemplary 0-330 degree (ETALON) Gr.1 VERY RARE USSR NOS

Description

100%Original NEW USSR!!!
Manufacturer "ATOMMASH"
Multi-faceted prism accuracy classes 0, 1 and 2 with the number of faces: 6; 8; 10; 12; 18; 20; 24 and 36 designed to test the model (reference) and working means of measurement of angles. Multi-faceted prisms can be used also as a working means of measurement of angles. Measuring surface of the prism mirror has a protective cover 1 and 21E for OST 3-1901-73. The perpendicularity tolerance of the measuring surface of the prism to the base plane of the rim should not exceed: - 15” prisms of accuracy class 0; - 20” for prism accuracy class 1; - 30” prism of accuracy class 2; Deviations of the working angles of the prism from the nominal value: - 5” prisms of accuracy class 0; - 8” for prisms of accuracy class 1; - 15” prisms of accuracy class 2;
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