VZS New Method of making Cement for Terraces '^ 



and has with flood four fevere winters andour fcorching fum- 

 mers. 



One precaution which I did not take, and which embar- 

 rafl'ed me a good deal, was to pound the Hmeilone before it 

 was employed. The flone diUblves in water; but fome ftones 

 being lefs calcined than others, their nucleus does not dilToIve, 

 and only becomes penetrated with moifture. When thefe 

 are blended with the gravel aud filiccous matters employed, 

 at the end of fome days the cement blillers and fplits into 

 fmall fragments, and bits of the lime which have not been 

 diflblved are found in the ftateof lime (laked in the open air. 



Take two nieafures of river pebble* well waflied, or frag- 

 ments of brick of the fizc of a nut ; two of tiles and iron 

 fcales coarfely pounded, one of river fand perfeftly well 

 walhed, and a meafure of the lime of Cazeres, jull from the 

 kiln, and pounded. 



Form a circle with the fand, and throw into the hollow the 

 lime which has been flaked, taking care to mix it thoroughly: 

 when the lime is well diluted leave it in that flate for three 

 hours in order that the whole lime may be diffolved ; then 

 mix with it gradually the river pebbles, the iron fcales, the 

 tiles, and the fand. This mortar muft then be worked for 

 half an hour, that every filiceous flone and fragment of tile 

 may be well incorporated*. 



Such is the manner in which I prepare cement. There 

 are two methods of employing it ; either above a pavement 

 of brick, or below it. The former appears to be the moft 

 iolid during the firft year, while the other fullers the raia 

 water to filter through it, but at the end of a certain time it 

 acquires the mofl perfeft folidity. 



As time dellroys the timber on which the mortar is placed, 

 when a terrace is intended to be made on a floor it mufl be 

 coarfely covered with land and clay : when this covering is 

 dry, another, compofcd of mortar and pretty fat fand, mull 

 be placed over it : there is no iieceflity for cutting the bricks, 

 and the upper furface mu(l be rough or notched with a chifel. 

 This pavement mufl have an inclinalicn fufficient to make 

 the water run off. 



In the month of July, when the two coverings are very 

 dry, the cement compofcd in the above manner mufl be ap- 

 plied in bands of two feet in breadth ; two workmen are 

 fufficient. This flratum of cement ought to be from two 



■"* When the cement is almoft finiflied throw over it about a bufhel of 

 qnickliinein powder. The mortar then becomes very difficult to bcftirred. 

 Or two pints of milk of lime arc then to be added, which will penetrate 

 the cement in every part, 



inches 



