Newall, H. F · London : Society for Promoting Christian Knowledge · leaf 153
attempt is only made to bring a few notablephenomena before the reader in order that he maygain some insight into the reasons for believing inthe possibility of measuring such infinitesimallyminute things as we have stated the wavelengthsof light to be. Let Fig. 52 represent on an enlarged scale a… … P^PI? o p, P PflPFig. 52. tion bands by saying that when the light from thecandle (which is supposed to be far beyond the topof the page) passes throughthe aperture, the illuminationis bright at and near 0, butfalls off: on either side gradu-ally till there is darkness atP1; then it brightens up…
Spectroscope · Spectrum analysis
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-371-234.webp)
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