Excerpt from On Modern Carriage-Ways: Being a Paper Read Before the Sheffield Literary and Philosophical Society, on Friday, Nov; 3rd, 1843 A cheaper and more successful application, of a non absorbent cement, has been used three or four years in Nottingham. I allude to the method of coating broken stone, with gas tar, for which Mr. Thomas Smart, of that town, endeavoured to obtain a patent, but without success. The stone is broken down to two inches in diameter, heated in a furnace, then covered with tar, and afterwards spread over the road about three inches thick, upon a substratum of ashes or other dry rubbish it is then rolled with a large cylinder, after which another stratum, of similar material, broken to an inch, or an inch and a half, is laid on, when the rolling is repeated.

The quantity of tar de ends upon the absorbing power of the stone; and the facilities for obtaining ashes, stone, andtar, must affect any calculation of the original cost.

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