MEGHAmCAL. 801 



3. Cement for Leather.— Sulphide of carbon, 10 parts ; spirits of 

 turpentine, 1 part ; into which, in a suitable bottle, put finely cut shreds of 

 pure gutta percha, to make a thickly-flowing liquid. To remove grease from 

 the belts or leather to be joined, put a cloth upon it, and apply a hot iron for 

 a while : then apply the cement to both surfaces, put together and apply pres- 

 sure until dry. 



4. Cement for Rubber, and to Fasten Rubber to Metal, 

 Glass and Other Smooth Surfaces.—" Powdered shellac is softened to 

 ten times its weight of strong wat 3r of ammonia, whereby a transparent mass 

 Is obtained, which becomes fluid after keeping some little time, without the 

 use of hot water. In three or four weeks the mixture is perfectly liquid, and 

 when applied it will be found to soften the rubber. As soon as the ammonia 

 evaporates the rubber hardens again — it is said quite firmly — and thus becomes 

 impervious both to gases and to liquids. For cementing sheet rubber or rubber 

 material in any shape to metal, glass or other smooth surfaces the cement is 

 highly recommended." 



n. Cement for Rubber Goods, Fastening' Rubber Soles, 

 Leather Patches, Straps, etc.— Fill a bottle one-tenth full of native 

 Indian rubber (gutta-percha) cut in minute shreds ; pour in benzole till the 

 bottle is three-quarters full ; shake every few days until the mixture is as 

 thick as honey. This dries quickly. It is useful to mend rubber shoes Ox any 

 other rubber goods, as a water and air-tight cement for bottles — simply dip- 

 ping the corks into it, and for a hundred other purposes. Three coats of this 

 will unite leather straps, patches and rubber soles with firmness. To make a 

 patch invisible, shave the edge of the leather quite thin. 



6. Cement, Similar to that upon Postage Stamps, Gummed 

 Labels, etc., Good for Scrap Books, Labeling on Tin, Glass, etc. 

 — Dextrine, 2 ozs. ; acetic acid and alcohol, each, i oz. ; water, 2^ ozs. 



Directions.— Mix the dextrine, acetic acid and water, stirring until thor- 

 oughly mixed ; then add the alcohol For attaching labels to tin, first rub the 

 surface with a mixture of equal parts of muriatic acid and alcohol ; thea 

 apply the label gummed with a very thin coating of the cement, and it will 

 adhere almost as well as on glasa A thin coat only is needed on " scraps*** 

 for scrap books. 



Remarks. — Knowing the value of a paste, or cement, somewhat similar to 

 this, where the adhesion depended upon the dextrine, I have every confidence 

 in this for all the purposes named. 



6. Cement for Small Leaks in Steam Boilers.— Experiments 

 have shown the following to be effectual for stopping small leaks from the 

 seams of boilers, pipes, etc. Mix equal parts of air-slacked lime and fine sand; 

 and finely powdered litharge equal to both the first Keep the powder dry, in a 

 bottle, or a covered box. When wanted to apply, mix, as much as needed, to 

 a pastes with boiled linseed oil, and apply quickly, as it soon hardens. 



51 



