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 76
can see throughit a distant body as a star at S, while the lower part isa reflector. 95. Define the Sextant—For what is it particularly valu-able ? Describe it from figure 14. Where is the Vernier andwhat is its use ? Specify the manner in which the light comesfrom the object to the eye. How can we… … being at M, and the star at S. The instrument is heldfirmly in the hand, so that the eye, looking through thetelescope, sees the star S through the transparent part otthe Horizon Glass. Then the movable arm ID is movedfrom F towards E, until the image of M is carried downto S, when the number of…
Astronomy
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