. Engineering and Contracting. ither through carelessness or in order tosave a few steps. Clean cut joints betweenthe slabs and expansion joints adjoining thecurbs at streets and alley returns, and atfrequent intervals in long stretches of walk,are absolutely necessary if broken curb stonesand broken slabs in the walks are to beavoided. Expansion joints at street and alleyreturns can be eliminated by constructing thecurbing with a recess into which the side-walk slab may be laid. Data on Street Work, Carlisle, Pa.—Dur-ing 1909 two blocks, sq. yds, of asphalticmacadam were laid on East Lo
. Engineering and Contracting. ither through carelessness or in order tosave a few steps. Clean cut joints betweenthe slabs and expansion joints adjoining thecurbs at streets and alley returns, and atfrequent intervals in long stretches of walk,are absolutely necessary if broken curb stonesand broken slabs in the walks are to beavoided. Expansion joints at street and alleyreturns can be eliminated by constructing thecurbing with a recess into which the side-walk slab may be laid. Data on Street Work, Carlisle, Pa.—Dur-ing 1909 two blocks, sq. yds, of asphalticmacadam were laid on East Louther St., atCarlisle, the work being done by day old bed was so worn that 6 in, of newstone was required. After this stone hadbeen thoroughly compacted by rolling, heatedasphalt, 90 per cent pure, was forced to pene-trate about 3 in. by a special sprinklingwagon: it was then covered with screeningsand rolled. The cost of the 4,400 sq. yds. ofasphaltic macadam was $1,0G9, or 25 cts. per /fai/ SOTeeA SC£ Sfa/x/arz/. Fig. 2—Experimental Track of the Syracuse Lakeside & Northern Ry. at Syracuse, N. Y. portion of the street laid wooden cross tics on(i ins. of concrete. The concrete was broughtup to the top of the cross ties and brick pave-ment on a sand cushion laid to grade. A 90-lb. tee rail (American Society of Civil Engi-neers standard) was spiked to the cross same type of special brick was used nextto the gage line. Hints on Constructing Cement Sidewalks —The following hints have been taken froma paper by Mr. N. R. Murray, superintendentbureau of sidewalks of Chicago, 111., presentedat the last annual convention of the IllinoisSociety of Engineers and Surveyors: Beforeconstructing cement walks on a foundationthat has been traveled over for several months,pick up the entire surface, flood and rctampit. The reason for this is obvious. On fill- square yard. This cost can be itemized asfollows: Per sq. yd. New stone $ Labor and rolling 05 Asphalt and
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