Heliostat Prazmowski

A rare heliostat signed on the white enamel dial

 

A. Prazmowski. 1, Rue Bonaparte, Paris. 

 

The dial is graduated around three-quarters of the circumference IV-XII and I-VIII with ten-minute subdivisions, subsidiary seconds dial. The heliostat is placed between two tapering brass uprights, one of which has a pierced vertical quadrant, ungratuated, mounted on the inside, with screw clamp. Placed on a brass circular brass plate with a pierced centre. The brass drum houses the mechanism, with a winding key at the back. The octagonal mirror is mounted in the centre on threaded split sleeve with a knurled tightening wheel.

 

A heliostat is an instrument designed to capture a reflection of the Sun (or other Celestial body) over a period of time, by rotating a clockwork mirror to match the Sun’s apparent path through the sky.

 

Diameter 9,6 cm.

France, circa 1880.

In good condition.

 

€ 2.850,-