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Heliometer
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Description: "Dollond's divided object-glass heliometer of the third type. A is the end of the reflecting telescope, upon which the adapter B is fitted. B carries a wheel (not seen in the figure) formed of a ring racked at the outer edge, and fixed to the brass plate CC, so that the pinion moved by the handle D may turn it into any position. Two plates F, G, with the attached semi-lenses, move in slides fixed to the plate CC, —simultaneous motion, in contrary directions, being communicated to them by turning the handle E, which drives a concealed pinion that works in the two racks seen in the highest part of the figure." —The Encyclopedia Britannica, 1903
Source: The Encyclopedia Britannica, New Warner Edition (New York: The Werner Company, 1893)XVI:250
Keywords: Heliometer, Dollond, Telescope, Pinion, Lense,
Copyright: 2009, Florida Center for Instructional Technology. See license.
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