Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 752
Tempered glass, that is, glasswhich has been heated and suddenly cooled, likewise ex-hibits the presence of unequal stresses when examined bythe polariscope. In thick pieces of glass, such as are used for lenses ofconsiderable size, it is difficult to anneal the blocks so thatthey will not show… … f BE Fig. 487. 636. Rings and Cross. — If a plate cut from auniaxial crystal be placedbefore the analyzer, and observed in convergent plane po-larized light, a series of brilliantly colored rings interruptedby a rectangular bright or dark cross (Fig. 487) may beobserved. Let 3IX (Fig. 488)…
Physics
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