| Show DEPTH OF MACADAM the thicker the ra 1 the he greater ire ali A af of f the uasa the lol 6 so 80 called MaCIN macinday dAw nude con flit slit of a few auches of broken tone laid en on the surface of tho ho ground without any ny provision provi tiou for pru enting the stones from rp reading un auber ler the pres bure ot of load loads L bould bu be made a trench tit of the width and depth intended for the roadbed for if a bt six iz inches of c stone ou on a good foundation trill will answer but for heavy traffic this Is i not chent the pressure ct cl a load pasting passing ove a compact road am da oat cut through the aly iu in conc lilo liko torm form the apex leing if in at the load on the furforo fur foco with a depth of bet but 0 lachen the at the lotto bottom will be spread out over SO U quare square inches it it is I 1 9 inches deep tho on rill the foundation will reread over 81 square inches aud and it 13 12 inches deep it is ci or square idelles depth cf of readied licaus th the or ara of ot the base fa staining the weight of the load increases lu creasea as the square of abe A road 13 ain Is four time times us as streng an cue six leeboo deep derri |
