Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 162
ing frame in such away that changes of temperature will not cause the tubeto be pinched or sprung. The mason has endeavoredto set the supporting piers so solidly that nothing shortof a miniature earthquake will disturb their positions. The astronomer views the finished work with the ad-miration… … i56 A Study of the Sky. Flexure. Errors ofgraduation. Level errors. Movements ofthe ground. A difficult task. The pivots on which the instrument revolves are ofunequal sizes, and neither of them is round. For thisreason alone the sight-line, instead of tracing a perfectcircle on the sky, traces a…
Astronomy
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