By Seckel, constructed in brass, the arc signed E.R. Seckel & Co. 18 Willemskade Rotterdam with inset silvered scale divided 5- 0- 120, the index arm vernier with tangent screw fine adjustment and clamp with swivel magnifier, three shades, two mirrors and pin hole sight with thread for telescope and rosewood handle, fitted carrying box with test certificate for 1910, carrying handle and securing hooks 28cm. wide
Details
A LATE 19th CENTURY 19cm. RADIUS VERNIER OCTANT
By Seckel, constructed in brass, the arc signed E.R. Seckel & Co. 18 Willemskade Rotterdam with inset silvered scale divided 5- 0- 120, the index arm vernier with tangent screw fine adjustment and clamp with swivel magnifier, three shades, two mirrors and pin hole sight with thread for telescope and rosewood handle, fitted carrying box with test certificate for 1910, carrying handle and securing hooks
28cm. wide
By Seckel, constructed in brass, the arc signed E.R. Seckel & C
28cm. wide