Olmsted, Denison, 1791-1859. [from old catalog] · 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 ofthe 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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