Side-lights on astronomy and kindred fields of popular science; essays and addresses (1906)
Newcomb, Simon, 1835-1909 · New York Harper · leaf 105
e.As he cannot see through the flame itself, he mustlook first on one side and then on the other, and see 85 SIDE-LIGHTS ON ASTRONOMY if the arrangement of the images seen in the lensesis symmetrical. If, going to different distances, hefinds no deviation from symmetry, in this respect… … IMAGE OF CANDLE-FLAMEIN OBJECT-GLASS TESTING ADJUSTMENTOF OBJECT-GLASS Place this reflector in the prolongation of the opticalaxis, set the candle so that the light from the re-flector shall be shown through the glass, and lookthrough the opening. Images of the reflector itselfwill then be seen in…
Astronomy
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