Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 29
al ; the other Y can be moved north and south, and bymeans of astronomical observation the axis can be placeddue east and west. When the axis of rotation is horizontal and also due eastand west, it must be perpendicular to the plane of the me-ridian ; then, if the line of collimation is… … remaining wires must be parallelto the plane of the meridian.When the image of a heavenlybody is on the middle wire of theparallel system the body itselfmust be on the meridian of theplace. Explanation. The projection of a transitinstrument on a vertical plane perpendicularto the meridian. AB is…
Astronomy
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