Engineering and Contracting . il. The weight of the paint ready foruse shall not be less than 18 lbs. per gallon. The second coat of field paint shall bemixed in the proportions of 85 lbs. of purewhite lead ground in oil to 15 lbs. of pureAmerican white lead ground in oil, with suf-ficient pure French yellow ochre ground in oiland pure carbon black ground in oil to givethe color desired by the director, the pigmentto be added to the pure raw linseed oil in suchproportions that the paint when ready for usewill weigh not less tlian 10 lbs. per gallon. Xo drier shall be used in the shop paint and
Engineering and Contracting . il. The weight of the paint ready foruse shall not be less than 18 lbs. per gallon. The second coat of field paint shall bemixed in the proportions of 85 lbs. of purewhite lead ground in oil to 15 lbs. of pureAmerican white lead ground in oil, with suf-ficient pure French yellow ochre ground in oiland pure carbon black ground in oil to givethe color desired by the director, the pigmentto be added to the pure raw linseed oil in suchproportions that the paint when ready for usewill weigh not less tlian 10 lbs. per gallon. Xo drier shall be used in the shop paint andonly in limited quantities in the field paint, alldrier to be shipped to the site in separatepackages and added to the paint. All red and white lead to be 90 per centpure, all American white zinc to be 09 percent pure, and all carbon black to be 08 percent pure carbon. All yellow ochre to be pureFrench ochre and to contain not less than \Jper cent ferric oxide and not more than 5 percent of lime in any form. Driers used shall. Under Clearance Una E&C Fig. 2. Cfoss-Section of North Side Point Bridge, Pittsburgh, Showing Type of Floor Construction, Sizes and Dimensions. 0 ins. The total width of the bridge, out toout of steelwork, is 60 ft. 0 ins. STRESSES AXD SECTIOXS. Figure 1 shows the stress sheet for the 531-ft. spans. This drawing shows the dead load,live load, impact and maximum stresses foreach member of the truss, together with thesection used. By noting the material given for the upperchord section it will be seen that the sectionhas three webs. The top flange consists offour angles and a cover plate, and the bottomflange of four angles latticed with 5x% The three webs are braced by dia-phragms placed near the ends of each mem-ber. The intermediate posts are subdivided,and are braced by an eflicient system of swaybracing and by longitudinal struts. Thelargest eye bars used in the lower chord havea section of 12x2% ins. The maximum sizeof pin (at Ln and U:) has
Size: 2692px × 928px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
