yo The Horticulturist' s Rule- Book. 



Cement and Mortar (Boiler Cements), continued. 



and clean iron filings, of each, 5 parts. Grind together, and 

 calcine or heat. 



2. Powdered clay, 6 Ibs. ; iron filings, i Ib. Make into 

 a paste with Iin3ocd oil. 



3. Powdered litharge, 2 parts ; silver sand and slaked 

 lime, of each, i part ; boiled oil enough to form a paste. 



These cements are used for stopping leaks and cracks in 

 boilers, iron pipes, stoves, etc. They should be applied as 

 soon as they made. 



TAR CEMENT. Coal tar, i part ; powdered slate (slate 

 flour), 3 or 4 parts ; mix by stirring, until thoroughly incor- 

 ' porated. Very useful for mending watering pots, barrels, 

 leaky sash, etc. It remains somewhat elastic. It does not 

 adhere to greasy surfaces. It will keep for a long time 

 before using. 



COPPER CEMENT. Beef blood thickened with sufficient 

 finely powdered quick-lime to make it into a paste is used 

 to secure the edges and rivets of copper boilers, kettles, 

 etc. Use immediately. 



FIREPROOF or STONE CEMENT. Fine river sand, 20 

 parts ; litharge, 2 parts ; quicklime, i part ; linseed oil, 

 enough to form a thick paste. Used for walls and broken 

 stonework. 



EARTHENWARE CEMENT. Grated cheese, 2 parts ; pow- 

 dered quicklime, i part; fresh white of egg, enough to 

 form a paste. Use as soon as possible. 



For fine earthenware, liquid glue may be used. 



CEMENT FOR GLASS. Methylated spirit sufficient to 

 render liquid a half dozen pieces of gum mastic the size 

 of a large pea ; in another bottle dissolve the same quantity 

 of isinglass, which has been soaked in water and allowed to 

 get surface dry, in 2 oz. of methylated spirits ; when the 

 first is dissolved add 2 pieces of either gum galbanum or 

 gum ammoniac ; apply gentle heat and stir ; add the solu- 

 tion of isinglass, heat again and stir. Keep in a tightly- 

 stoppered bottle, and when used set in boiling water. 



