Newall, H. F · London : Society for Promoting Christian Knowledge · leaf 46
nd if some peculiar feature be ob-served in a spectrum, its positionin the spectrum can be defined bythe number on the divided circlewhich defines the position of the ob-serving telescope, when the peculiarfeature falls on the cross-wires inthe field of view of the telescope. With reference to the… … 40 THE SPECTROSCOPE AND ITS WORK [CHAP. boundary of the field of view of the eyepiece, and ABand CD represent the cross-wires; these are inclinedto one another at an angle of about 30°, and are usedin the following way. Mapping a Spectrum. Let us suppose that the spectrum observed is thatof an…
Spectroscope · Spectrum analysis
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