^ew Method of making Cemenifor Terraces y ^c, iitj 



XXV. Another Cemnit of the fame Kind. 



Take two parts flowers of fulphur and one part fal -ammo- 

 niac, and mix tliem together with a little water into a ftiff 

 paftc. 



Take alfo borings or turnings of caft iron in the ftate in 

 which they are cximnionly found in works where boring and 

 turning are carried on, viz. mixed with fand, and lift thenx 

 finely to get rid of the groller particles. 



When the cement is wanted for ufe, diflcilve a portion of 

 the above pafte in urine, or in water rendered flightly acidu- 

 lous, and to the folution add a quantity of the fifted borings. 

 This mixture, fpread upon or between flanches of iron pipes, 

 or put into the interllices of other parts of iron work, will in 

 a little time become as hard as a ftone. 



XXVT. Blood Cement. 



A cement often ufed by copperfmiths to lay over the 

 rivets and edges of the fheets of copper in large boilers, to 

 lerve as an additional fecurity to the joinings, and to fecure 

 cocks, &c. from leaking, is made by mixing pounded quick- 

 lime with ox's blood. It n)u(l be applied frefti made, as it 

 foon gets fo hard as to be unfit for ufe. 



We believe, if the properties of this cement were duly in- 

 veltigated, it would be found ufeful for many purpofes to 

 which it has never been yet applied. It is extremely cheap, 

 and very durable. 



[To be continued occafionaliy.] 



XX. On a ncnju Method of making Cement for Terraces ; and 

 the Ufe of liquid yitch to render them impermeable to Water, 

 and fecure from the Attacks of Frojt. By Casimik. 



PUVMAURIN, 



I 



SHALL not fpcak of the nature of the different lime- 

 cements hitherto known, as they have been fully defcribcJ 

 by various authors ; I fliall only obferve, that a cement ought 

 to be hard, folid, and impermeable. Vo obtain a iiard and 

 folid cement it has been neceflTary to employ diilerent bodits 

 which, by their aggregation with lime, diflolvcd in water, 

 fpcedily abforb the fuperabundant moillure, anil furnifli to 

 the particlcri of lime diHiifed throughout the cement the car- 

 bonic acid ncceflary for rendering it folid, and rcgenernting it 

 into calcareous eanh. 



Vtlrified 



