Identifier: scienceforbeginn00barb (find matches)
Title: Science for beginners
Year: 1921 (1920s)
Authors: Barber, Frederic Delos, 1868- Fuller, Merton Leonard, 1872- joint author Pricer, John Lossen, 1871-1920, joint author Adams, Howard William, 1875- joint author
Subjects: Science
Publisher: New York, H. Holt and Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 35.—Weave shed at a cotton mill, showing the saw-tooth roof.We are looking at the northwest corner of the building; the roof win-dows face the north. white paint. Still further to control the light, muslin cur-tains or light, semi-transparent shades are hung before thesewindows. It is becoming common practice for factories to be con-structed with what are known as saw-tooth roofs (Figs.35 and 36). The windows are placed in a slanting positionon the north slope of the saw-tooth roof, thus admittingonly diffused light from the northern sky. By this methodof lighting, even large rooms may be evenly and effectively 52 THE PRODUCTION AND USE OF LIGHT lighted with a soft, mellow light. It is found in factoriesthus lighted, not only that the employees can do more andbetter work on account of the better light and lack of shadows,but also that the expense of artificial lighting is greatlyreduced. School officials and schoolhouse architects are beginning to
Text Appearing After Image:
Fig. 36.—Interior view of the weave shed. The camera stood in thesouthwest corner of the room. Note the evenness of the lightingthroughout the room. This room is 253 ft. by 140 ft. and contains648 looms. recognize the great value of this method of lighting. Figures37, 38, and 39 give three views of a schoolhouse thus lighted.Notice that in Fig. 39 all shades are drawn and that mostof the light comes from above. Nearly all of the ceiling ofthe room is fitted with ribbed glass so that none but diffusedlight from above can enter. It has been found that no arti-ficial lighting is needed in this schoolroom during school hours NATURAL AND ARTIFICIAL LIGHTING 53 at any time during the year, although this particular school-house is located in northern Illinois. It should always be remembered that direct light producesa glaring effect which is unpleasant and trying to the eye,

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