Hartmann Spectrocomparator

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A Hartmann Spectrocomparator device to measure accurate displacement of the star by measuring the relative star motion to the observer. The object is first photographed, then the image is attached to the device measuring the distance.

Galleries

Astronomy

Source

Encyclopaedia Britannica (11th ed., vol. 18) (New York, NY: The Encyclopaedia Britannica Company, 1910)

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TIFF (full resolution)

1988×2400, 2.3 MiB

Large GIF

848×1024, 323.1 KiB

Medium GIF

530×640, 139.7 KiB

Small GIF

265×320, 37.5 KiB