Roberts' stellar pantograver

Roberts' stellar pantograver

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Credit: ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY

Caption: Roberts' stellar pantograver. This device was invented by British amateur astronomer and engineer Isaac Roberts (1829-1904). He invented this device to allow the positions of stars to be engraved on copper plates. Roberts described the device in an article published in 1888 in Volume 49 of Monthly Notices of the Royal Astronomical Society (MNRAS). The labels indicate: the framework (A), roller-mounted cast-iron platforms mounted at right-angles (B and C), a square stage (D) and a round stage (E), and various micrometers, microscopes, eyepieces, and adjusting screws (F-M). The engraving tool (N) is at upper left.

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