Part 63

Directions for Use.—The leather belts to be cemented should first be roughened at the joints, and after the cement has been applied they should be subjected to a strong pressure between warm rollers, whereupon they will adhere together with much tenacity.

«Preservation of Belts.»—In a well-covered iron vessel heat at a temperature of 50° C. (152° F.) 1 part by weight of caoutchouc, cut in small pieces, with 1 part by weight of rectified turpentine. When the caoutchouc is dissolved add 0.8 part of colophony, stir until this is dissolved, and add to the mixture 0.1 part of yellow wax. Into another vessel of suitable size pour 3 parts of fish oil, add 1 part of tallow, and heat the mixture until the tallow is melted; then pour on the contents of the first vessel, constantly stirring—an operation to be continued until the matter is cooled and congealed. This grease is to be rubbed {106} on the inside of the belts from time to time, while they are in use. The belts run easily and do not slip. The grease may also serve for improving old belts. For this purpose the grease should be rubbed on both sides in a warm place. A first layer is allowed to soak in, and another applied.

«To Make a Belt Pull.»—Hold a piece of tar soap on the inside of the belt while it is running.

BELT CEMENT: See Adhesives.

BELT GLUE: See Adhesives.

BELT LUBRICANT: See Lubricants.

BÉNÉDICTINE: See Wines and Liquors.

«Benzine»

«Benzine, to Color Green.»—Probably the simplest and cheapest as well as the best method of coloring benzine green is to dissolve in it sufficient oil soluble aniline green of the desired tint to give the required shade.

«Purification of Benzine.»—Ill-smelling benzine, mixed with about 1 to 2 per cent of its weight of free fatty acid, will dissolve therein. One-fourth per cent of tannin is added and all is mixed well. Enough potash or soda lye, or even lime milk, is added until the fatty acids are saponified, and the tannic acid is neutralized, shaking repeatedly. After a while the milky liquid separates into two layers, viz., a salty, soapy, mud-sediment and clear, colorless, and almost odorless benzine above. This benzine, filtered, may be employed for many technical purposes, but gives an excellent, pure product upon a second distillation.

Fatty acid from tallow, olive oil, or other fats may be used, but care should be taken that they have as slight an odor of rancid fat as possible. The so-called elaine or olein—more correctly oleic acid—of the candle factories may likewise be employed, but it should first be agitated with a 1⁠/⁠10-per-cent soda solution to get rid of the bad-smelling fatty acids, especially the butyric acid.

«The Prevention of the Inflammability of Benzine.»—A mixture of 9 volumes tetrachloride and 1 volume of benzine is practicably inflammable. The flame is soon extinguished by itself.

«Substitute for Benzine as a Cleansing Agent.»—

I.—Chloroform 75 parts Ether 75 parts Alcohol 600 parts Decoction of quillaya bark 22,500 parts

Mix.

II.—Acetic ether, technically pure 10 parts Amyl acetate 10 parts Ammonia water 10 parts Alcohol dilute 70 parts

Mix.

III.—Acetone 1 part Ammonia water 1 part Alcohol dilute 1 part

Mix.

«Deodorizing Benzine.»—

I.—Benzine 20 ounces Oil of lavender 1 fluidrachm Potassium dichromate 1 ounce Sulphuric acid 1 fluidounce Water 20 fluidounces

Dissolve the dichromate in the water, add the acid and, when the solution is cold, the benzine. Shake every hour during the day, allow to stand all night, decant the benzine, wash with a pint of water and again decant, then add the oil of lavender.

II.—First add to the benzine 1 to 2 per cent of oleic acid, which dissolves. Then about a quarter of 1 per cent of tannin is incorporated by shaking. A sufficient quantity of caustic potassa solution, or milk of lime, to combine with the acids is then well shaken into the mixture, and the whole allowed to stand. The benzine rises to the top of the watery fluid, sufficiently deodorized and decolorized for practical purposes.

III.—To 1,750 parts of water add 250 parts of sulphuric acid, and when it has cooled down add 30 parts of potassium permanganate and let dissolve. Add this solution to 4,500 parts of benzine, stir well together, and set aside for 24 hours. Now decant the benzine and to it add a solution of 7 1⁠/⁠2 parts of potassium permanganate and 15 parts of sodium hydrate in 1,000 parts of water, and agitate the substances well together. Let stand until the benzine separates, then draw off.

IV.—Dissolve 3 parts of litharge and 18 parts of sodium hydrate in 40 parts of water. Add this to 200–250 parts of benzine and agitate well together for two minutes, then let settle and draw off the benzine. Rinse the latter by agitating {107} it with plenty of clear water, let settle, draw off the benzine, and, if necessary, repeat the operation.

BENZINE, CLEANING WITH: See Cleaning Preparations and Methods, under Miscellaneous Methods.

BENZOIC ACID IN FOOD: See Food.

BENZOIN SOAP: See Soap.