Newall, H. F · London : Society for Promoting Christian Knowledge · leaf 154
AN with AB; or inother words, the whole wave-length with the width of theaperture. To make the comparison ex-perimentally in a simple mannerlet the reader now set up twocandles, side by side, six inchesapart, one being about twoinches taller than the other • hewill be able (i) to observethrough the… … 144 THE SPECTROSCOPE AND ITS WORK [CHAP. lower flame comes immediately under the first lateraldark band on the left hand of the upper flame. Heshould then be able (iii) to satisfy himself (Fig. 55)that the aperture he has used contains four timesas many wavelengths in its width as there are feet…
Spectroscope · Spectrum analysis
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