4 0 c m
35cm
actual image size: 27cm x 32cm
Description
Heliostat by Jules Duboscq. Brass astronomical heliostat with clockwork drive on adjustable stand. A heliostat is used to direct sunlight into a room or into an instrument. The mirror is rotated by clockwork to track the sun as it appears to move across the sky.
Image Details
Image Ref.
10408625
© Science Museum / Science & Society Picture Library