Scale and calculating rule. Scale and calculating rule. Gehter.

Scale and calculating rule
Collection MAE RAS: МЛ-3713
Image ID: 3850935
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Museum inventory number:
МЛ-3713
Title:
Scale and calculating rule
Author:
Gehter Johann Christian
Materials:
brass
Technics:
engraving
Commentation:
Plane rule with engravings on both sides. It has equal schedule with transversal scale and schedule to calculate trigonometric functions. Inscriptions: "Trigonometria Anarifmetica"; "Joh: Christ: Gehter".