Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 159
, one horizontal,the other vertical. If Fig. So.—The Spider-webs. he wishes tO Sight at the top of a church spire he moves his telescope until thetip of the spire appears to lie on the intersection of thecross wires. At that instant a straight line drawn fromthe top of the steeple through the… … The Astronomer1 s Workshop. *53 line, which is a line drawn from the center of the object-glass* to the point where the horizontal and central ver-tical wires meet, is perpendicular to the horizontal axis.Let us point the telescope at some house miles away tothe southward. Since the horizontal axis…
Astronomy
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