File:A manual of personal hygiene - proper living upon a physiological basis (1917) (14577470518).jpg

Identifier: manualofpersonal00pyle (find matches)
Title: A manual of personal hygiene : proper living upon a physiological basis
Year: 1917 (1910s)
Authors: Pyle, Walter L. (Walter Lytle), 1871-1921
Subjects: Hygiene
Publisher: Philadelphia : W.B. Saunders Co.
Contributing Library: University of Connecticut Libraries
Digitizing Sponsor: University of Connecticut Libraries

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Fig. 62.—An improperly lighted room on a narrow street. curved surfaces are incorporated with the prisms.By these prismatic plates the insufficient perpen-
Text Appearing After Image:
FlG. 63.—The same showing improvement in lighting by prismatic devices. dicular light of a deep light-well or of a narrowstreet lined with high buildings may be so refractedthat it may be used to illuminate the darkest inte- 254 ^^^ ^^^• riors (Figs. 62 and 63). The prisms may be insertedin ornamental window panes or placed in the formof canopies inclined a few degrees from the ver-tical; or in cases of cellars and basements they maybe used in the form of mosaic tiling and be assistedby a second interior screen. These prisms are inex-pensive and ornamental, and are soon paid for inthe saving of gas or electricity, besides furnishingillumination infinitely more healthful to vision. Asimilar arrangement of prisms is also utilized in glassglobes, called holophanes, for gas, oil, or incan-descent lights suspended overhead. These globesdeflect most of the rays of light downward. The necessary hygienic precautions in readinginclude the selection when possible of large type,sufficiently

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