. The Ontario high school physics. Fig. 372.—Anotherform of total-re-flection prism. COLLADONS FOUNTAIN OF FIRE 327 This principle is also used in one form of the so-called Lnxfer prisms, two patterns ofwhich are shown in Fig. are firmly fastened in ironframes which are lot into the pave-ment. The sky-light enters fromabove, is reflected at the hypothenusalfaces, and effectively illuminates thedark basement Fia. 373.—Luxfer prisms, use-ful in lighting basements.

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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics