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Image from page 261 of “Handbook of construction plant, its cost and efficiency” (1914)
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Identifier: handbookofconstr00dana
Title: Handbook of construction plant, its cost and efficiency
Year: 1914 (1910s)
Authors: Dana, Richard Turner, 1876-1928
Subjects: Contractors’ operations Building
Publisher: Chicago, The M. C. Clark Publishing Co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress
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n Holes with the Little imp Drill. Fig. 88. Drilling Up Holes with the Little Imp Air Feed Drill. per shift. One blacksmith with a helper will keep 5 to 7drills supplied with sharp bits. In medium rock a bit must besharpened for each 2 ft. of hole, in hard rock, for each iys ft.,and in soft rock for each 4 ft. The direct cost of sharpeningbits by hand is about as follows: HANDBOOK OF CONSTRUCTION PLANT BlacksmithHelperCharcoal . . ,.00, 2.00 Total 140 bits at 4 cents = .60 Mr. T. H. Proskesays: The power drill-sharpener has re-moved many of theshortcomings attend-ant upon the handsharpening process,with the result thatwhere these machinesare used it is possibleto accomplish from 25to 100 per cent moredrilling than underthe old methods. Itake this to mean 25to 100 per cent moredrilling per trip to theshop on the part ofthe drill tender, whichstatement is wellwithin the facts. Es-pecially is this truewhen the machinesharpening is com-bined with the selec-tion of special drillsteels.
Text Appearing After Image:
Fig. 89 A. HAND HAMMER DRILLS Hand Hammer Drills are light, powerful, small tools which areadapted to light work in mines and quarries. Imperial Hand Hammer Drill No. MV2, complete .00 1 drill, 12-inch 1.15 1 drill, 24-inch 1.55 1 drill, 36-inch 2.00 1 drill, 48-inch 2.50 1 dolly 2.50 25 ft. of %-inch, 7-ply air hose complete 7.20 Total .90 Performance of Small Hand Hammer Drill The writer examined with some care the operation of a smallhand hammer drill in the field operating in granitic schist in aNew Hampshire quarry. The accompanying photographs, Figs.89A and 89B, show the drill in operation with the dust coming out DRILLS 257 of the hole and being carried away by the wind; and the operatorin the act of releasing drill steel from the chuck. This operationof changing steels required an average of 11% seconds on thepart of a highly skilled operator. The field notes of this testwere as follows: ; Time . Hours, 1 Minutes Seconds 3 2537 54% 2031% 20 % 13%221/2 Start of first stee
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Image from page 47 of “Building & engineering news” (1914)
Men should discount cialis about discount cialis massage their male organ with 8 to 10 drops of the oil brings the best results.
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Identifier: buildingengineer2127cont
Title: Building & engineering news
Year: 1914 (1910s)
Authors: Contractors’ and Dealers’ Association of California
Subjects: Architecture Building Construction industry Engineering
Publisher: San Francisco : L. A. Larson
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library
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Type BAB Buildings also availableTYPE BCB—High Crane Type r^ Type M truss also available forcenter span SAWTOOTH TYPE (ST) MULTIPLE SPAN BUILDING Type MM shown; type A trussesalso available ALL GALVANIZEDStandard Steel Buildings Manufactured and Carried in Stockon the Pacific Coast rUnjIEEL Standard Buildings are the first all galvanizedstandard unit steel buildings to come on the market. Theyare the joint product of three old established companies—years of experience in manufacturing steel, fabricatingsteel products and erecting steel structures stand behindCOASTEEL Buildings. If you are an engineer, a contractor, an owner or a prospec-tive tenant, you are interested in learning the facts aboutCOASTEEL Standard Buildings. Just use the coupon MICHEL & PFEFFER IRON WORKS Tenth and Harrison StreetsSan Francisco :^^ ^^ -^ :P.. <t y i^ ^ #
Text Appearing After Image:
iV ,> r<J V ;^\V 0 C ^<y ^ N)^ <^ Building and Engineering News Devoted to the Architectural, Building, Engineering and Industrial Activities en the Pacific Coast Issued Every Saturday SAN FRANCISCO, CALIF., JULY 9, 192 7 Twe/nty-Seventn Year No. 28 Building &)EiT^ineering News 545-547 MISSION ST., SAN FRANCISCOKearny 1252 STARK-RATH PRINTING ANDPUBLISHING CO., Publishers J. P. FARRELL, Editor J. E. ODGERS, Advertising Manager Devoted to the Engineering, Archi-tectural, Building and Industrial Ac-tivities of the Pacific Coast. Subscription terms payable in advance J. S. and Possessions, per year .00 ZJanadian and Foreign, per year 6.00 Single Copies 25c Entered as second-class matter atSan Francisco Post Office under act ofCongress of March 3, 1879. SAN FRANCISCO BUILDING TOTALSFOR JUNE, 1927 Building construction in San Franciscoduring the month of June, 1927, representan expenditure of ,926,432, accordingto figures compiled by the Bureau ofBuilding Inspec
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