Repsolds Micrometer Box for Telescope Cape Observatory

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“The micrometer box, and of course with it the whole system of spider webs, is moved by the screw s, whilst the measuring web is independently moved by the screw S.” —Encyclopaedia Brittannica, 1910


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


TIFF (full resolution)

2400×1506, 727.8 KiB

Large GIF

1024×642, 128.1 KiB

Medium GIF

640×401, 65.1 KiB

Small GIF

320×200, 21.0 KiB