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Heliostat, 1850-1880.

Heliostat, 1850-1880.
4 0 c m
actual image size: 27cm x 32cm


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.

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© Science Museum / Science & Society Picture Library

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