... years,andheknewwhat a valuablematerial it was, but it was valuable in spite of the earth it contained. It might be comparedwithcement ; sand was putwithcementtomakevery good mortar,butthe sandhadnocementitiousvalue.Bitumens were found pure in the matrix of bituminous limestone or asphalt. I n...

... the roads, andto emphasize thefactthat if people wished to preserve the roads they must not use mortar-mills and stamps on them-for that was practically what iron tires andhorses feet were. If horses could be shod differently so much the better; buthis impression was that,inthe course of time,horse traffic...

... or something better. Indeed, he hoped the timewould soon come when the inverts of these ditches and partof the sides would beconcreted and rendered and floated in cement mortar topreserve the gradients, with perhaps a catch-pit a t intervals to arrest debris. Rough concrete inverts did not require much skill...

... gertid of side-slip. Although mechanical means of haulage might in time entirely supersede horsehaulage, this would not occur for many years to come ; and so long asthe horse was on the road there must always be dirt which, worked up into a greasy mortar by passing vehicles,wouldcause side-slip...

...-lime mortar is spread as a bed for the slabs. It is important that no part of the slabs be left unsupported. I n no case should slabs be allowed to break jointmore than 8 inches ; and it is well touse two sizes of closers, so that the jointson each side of any slab may not be oppositeone another. Whcn...