Heliometer
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“The type of instrument which resulted from Russian labors. The brass tube, strengthened at the bearing points by a strong truly-turned collars, rotates in the cast-iron cradle g attached to the declination axis. a is the eye-piece fixed in that axis, b the micrometer for reading both scales.” —The Encyclopedia Britannica, 1903
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AstronomySource
The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)
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