Identifier: architectenginee2210sanf (find matches)
Title: The Architect & engineer of California and the Pacific Coast
Year: 1905 (1900s)
Authors:
Subjects: Architecture Architecture Architecture Building
Publisher: San Francisco, Calif. : Architect and Engineer Co
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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e indicate that yellow fir is of a slower growth than red fir. It alsoranges higher in grade. Of the 94 yellow fir stringers teste.1 47.8 per cent wereselects, 40.4 per cent were merchantables, and lis per cent seconds. ( >f the162 red fir stringers tested 29.8 per cent were select-. 43.8 per cent were mer-chantables. and 26.6 per cent seconds, but. grade for grade, these tests show-that there is practically no difference in the Strength and Stiffness of red andyellow fir in bridge stringer sizes. STRENGTH OF RED AND YELLOW DOUGLAS Ilk BRIDGE STRINGERS(YelIo« Fir Expressed in Pei ( enl ol Red Kin KIND NUMBER rim;s PER WEIGHT PER CC. FT.IN POUNDS OF TESTS l\. 1! MOISI i in DRY LIMIT RUPTURE ■ Lbs. per Lbs. per Red Select 48 10.3 29.6 29.5 1127 Yellow 4.5* 17.5* 87.0 94 o 97 0 101 Keel Mcli ;; 71 9 0 27.7 1056 1554 Yellow ■ 38* 1(..4* 90.0 KM Red Sr< I mils 43 7.5 27.4 35. 7 28 0 1319 Yellow 11* 14.5* 98.0 104 0 105.0 * N..i Expressed in Per G nl 86 The Architect and Engineer
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I—Lathe Lighting Socket and a Steel Reflector Machine Shop Lighting* THE very little attention which has been given to artificial lighting inindustrial plants is doubtless due largely to the lack of efficient lightingaccessories. For years the only shades available for incandescent lampshave been the flat and 10-inch cone shades, neither of which did much toshield the eyes of the workmen from the glare of the lamp. A skilled work-mans value as a producer is dependent on the tools which he uses, and goodlight is one tool he cannot dispense with. Since the light is provided pri-marily for his use, that he may perform his work with maximum efficiency,it follows that it should be suited to his needs. With the flaming and intensified arcs now available, and particularlysince the advent of the tungsten lamp, it is possible to secure the requiredillumination of almost daylight quality, at even reduced cost of current, ascompared with the inefficient and costly installations of the past. Wi

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