Southern good roads . lity is not yet recorded so that a proper delinitrelation between th;^ values of the two methods can lieestablished. If, however, the object to be attained bythe work consists in having result a surface of cleanmacadam with the mosaic of the stones exposed andsimply their interstices filled with pitch, then a pitch that will later Lileed ]iiay be objectionable, and the se-lection of a pitch that will neither bleed nor be brittle,as will as care to a\oid the use of it in excess, becomesilliper;il ive. In siii-li wMik als ) unilorniity of ap[ilication of thepitch and iiiiif
Southern good roads . lity is not yet recorded so that a proper delinitrelation between th;^ values of the two methods can lieestablished. If, however, the object to be attained bythe work consists in having result a surface of cleanmacadam with the mosaic of the stones exposed andsimply their interstices filled with pitch, then a pitch that will later Lileed ]iiay be objectionable, and the se-lection of a pitch that will neither bleed nor be brittle,as will as care to a\oid the use of it in excess, becomesilliper;il ive. In siii-li wMik als ) unilorniity of ap[ilication of thepitch and iiiiiformity of the pitched surface are The exiierieiice of my d(-partnieiit is, howevei. that snfficient uniformity of application can behad by careful hand pouring. Such mechanical de\ices as lia\e been axailablc to us lune not been as sat-isfactory .IS hand work, • in general, as economical. Possibly the use of a propco pressure distributor mightin Slime cases be just died. .My experience also is that. Scene on Grandfather Muunlain, J,(Kill Feet Above Sea Level,Yonahlossee Turnpike a, slight \; ii! the ajiplicat ion of the pitch nia\ itself Ulliho sulise(|Uellt Iratlie ;iiid \veatlierIoiidit ions, and is not as seri ir,s a mattcr as a variancein the rec<iving surface. AVhere the stones of the mac,-iilam are to be them-seh-es exposed to traffic \ariatioii either in their uni-fin-mity of size or degrei- of compaction b<fore receiv-ing the pitch is a most serious nuitter. and one to bestrictl\ guarded against. Even when practically perfect screening of the of stone is had, if the stones are snn-dl sized,their compact mn aftei rolling will vary considerablyand this \aio,il ion will be in inverse ratio to the jierfec-t ion of the sci-eening. I have found in my work that the variation in compaction of the stone decreases as tlie size of tlie stoneis increased, [irovided the difference in size of minimumand maximum is not too gi-eat,
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Keywords: ., bookauthorvarnerhe, bookcentury1900, bookdecade1910, bookyear1910
