Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 359
Fio. 412.—A section of an apochromaticmicroscope objective made by Zeiss. 348 DISPERSION, COLOUR, SPECTRUM ANALYSIS … 399. The Rainbow. In the rainbow we have a solar spectrumon a grand scale. It is produced through the refraction and disper-sion of sunlight byrain-drops. In orderto see it the observermust look towardsfalling rain, with thesun behind him andnot more than 42°above the horizon.Frequently two…
Physics
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![An illustration from Declaration de l'vsage du graphometre : par la pratique duq[ue]l l'on peut mesurer toutes distances des choses de remarque qui se pourront voir et discerner du lieu ou il sera posé : et po[ur] arpenter terres, bois, prez, & faire plans de villes et forteresses, cartes geographiques, & generalement toutes mesures visibles : et ce sans reigle d'arithmetique (1597)](https://img.insideoutlibrary.com/img/200/ia-declarationdelvs00danf-120-30.webp)
