A compendium of astronomy; containing the elements of the science, familiarly explained and illustrated, with the latest discoveries. Adapted to the use of schools and academies, and of the general reader (1850)
Olmsted, Denison, 1791-1859 · New York, R. B. Collins · leaf 69
8. How is an image formed by a concave mirror 1 How isthis image magnified 1 When is the instrument called a re-fracting and when a reflecting telescope ? For what pur-poses are telescopes chiefly employed ? 56 THE EARTH. 89. The Transit Instrument is a telescope, which isfixed permanently in the… … m on two firm supports, as pillars of stone, for example, soconnected with the building as to be as free as possiblefrom all agitation. In figure 12, AD represents the tele- 89. What is a Transit Instrument ? On what supports doesit rest as represented in figure 12. Why are they made so…
Astronomy
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