Asphalt
Artificial Asphalt is now generally used in England for footpaths, &c. The recipes are various, one of the best being the following: Lime rubbish two parts, coal ashes one part (both must be very dry), sifted very fine; mix them, and leave a hole in the middle of the heap, wherein pour boiling hot coal tar; mix well together. When as stiff as mortar, lay it down, 3in. thick, on a dry and previously well-levelled surface. A boy should follow with dry, finely-sifted sand, distributing just enough to prevent his boots sticking to the tar. Two men should be employed for the tarring, whilst another should attend to the boiling operation. Only just enough tar to last ten minutes must be taken from the furnace at one time, as, if it be not boiling, the walks will become soft under the action of very hot sun. This may be repeated every three years. It is imperative that the surface, lime, coal ashes and sand be perfectly dry, and that the days selected for the operation be very fine, the hotter the better. Another excellent plan is that of using gas lime and coal ashes. There must be a firm foundation and smooth surface. Spread the gas lime to about 1 1/2in. deep, and level with the back of a spade. Over this place a thin layer of coal dust, and well roll. The work is then complete.