566 



THE INDIA RUBBER WORLD 



May 1, 1921 



The formula for magnesium oleate is C — 36, H — 66, O — 4, Mg. 

 as it takes two molecules of oleic acid (282) to combine with 

 one molecule of magnesium oxide (40). Therefore 564 pounds 

 of oleic acid combined with 40 pounds of magnesium oxide will 

 yield 588 pounds of magnesium oleate under ideal conditions. Or 

 it might be said that 14.7 pounds of magnesium oleate has as 

 much magnesium in it as that contained in one pound magnesium 

 oxide. 



Aluminum Oleate has a consistency resembling stiff jelly. It 

 has been used for thickening mineral oils, because it swells to 

 a considerable extent under their influence. Aluminum stearate 

 and, in fact, all of the stearates are solid, resembling hard waxes. 

 Zinc stearate is extensively used as an antiseptic dusting powder 

 in medical work. 



SPECIAL PATENTS 



E. S. Ali Cohen has obtained a patent in Norway, No. 29446, 

 February 10, 1919, for the production of a plastic mass of the 

 following type : a metal compound of a fatty acid (a water- 

 insoluble soap) is dissolved in a hydrocarbon of high boiling 

 point It is then treated with an oxidizing agent in a drying 

 oil, heated to 200 to 250 degrees C. 



\ patent taken out by the same inventor in Holland, No. 3293, 

 June 2, 1919, covers the use of the stearates of aluminum, man- 

 ganese, chromium or iron dissolved in a fluid hydrocarbon. These 

 compounds are suited as ingredients in linoleum compounds. 



GUIDE FOR MAKING SPLICES 



Tire Surgeon off'ers the following to those who realize 

 the money to be made by making one good tube out of two 

 old ones or in cutting sections from one tube and splicing 

 blowouts that are past repairing by the usual patch method. 



For example: In making a 30 by Syi tube from old tubes 

 of 3}/2-inch size, measure the longest portion and take from 

 another tube the difference, 85 inches, and allow 2 inches 

 for the splice which, when spliced, will give you the length 

 before last splice is made. The 85 inches allow for a 2-inch 

 splice, as shown in the column under "Splice Length." 



Pole Hole for Splice 



Length Valve Length 



Size Inches Inches Inches 



26=3 74/, ft 2 



30x3 sey, ft 2 



30x3/, 85 ft 2 



32x3/i 91<A H 2 



31x4 S6'A ft 2K 



32==4 89^4 « 2/a 



33x4 9VA H 2K 



34x4 96 H 3 



32x45^ 89!^ H 3 



33x4"4 93 41 3 



34x4^5 96 j| 3 



35x4^ 99 H 3 



36x4J^ 102^ H 3 



33x5 90 a 3 



35x5 97 a 3 



36=<5 lOOy^ H 3 



37x5 104 ii 3 



WOMEN RUBBER WORKERS 



A fair idea of the extent to which women entered the rubber 

 industry in America during the war period is given in a general 

 survey embodied in Bulletin No. 12, recently issued by the 

 Women's Bureau of the United States Department of Labor. 

 It is shown that out of the 23,987 workers reporting in 80 rubber 

 plants, after the first draft, 6,633 were women, or 276 in each 

 1,000 employed. After the second draft the proportion rose to 

 354 per 1,000. With the signing of the armistice and the closing 

 of the gas-mask factories included in the rubber group, the pro- 

 portion of women employed fell to 116 per 1,000. Statistics are 

 far from being complete, but seven tire factories reported about 

 4,294 women as having taken the places of men since 1917. They 

 have been employed to cut tire fabric with machines, others to 

 prepare fabric for men tire builders, while some make inner 

 tubes, stamp sizes and names on the tubes, and box them for 

 shipment. Tire beads and treads are trimmed and wrapped by 

 women, and small tires finished and inspected by women, "be- 

 cause of their deftness, quickness, and neatness." as one concern 

 puts it. 



In one large plant some women have replaced men in rubber 

 washing and in reclaiming, some have helped at the calenders, 

 others have cemented rubber boot parts, and some have taken 

 well to the work of molding rubber heels, while others have re- 

 placed men in cutting and cementing balloon fabric. But, gen- 

 erally speaking, relatively few women are still in the rubber 

 trades. 



"What is Vulcanization?" A brief, non-technical treatise 

 for the general reader, distributed by the United States Rubber 

 Co., 1790 Broadway, New York. 



The origin, development, and the universal importance of vul- 

 canizing are briefly and interestingly related ; and a very good 

 resume is given of the art of tire manufacturing. So exact is 

 this art that a "second" occurs but once in a thousand tires. 

 Users are reminded that a properly-cured tire cannot be subjected 

 to further curing without producing an "overcure," which results 

 in early destruction of the rubber. Hence are tire-owners 

 cautioned against careless retreading in which part of the carcass 

 is often overcured while the new tread is being vulcanized, and 

 the tire's life shortened, instead of being lengthened. 



junior rubber technologist 



The United States Civil Service Commission announces an 

 open competitive examination for junior technologist. Vacancies 

 in the Bureau of Standards, Department of Commerce, for dut>- in 

 Washington, D. C, or elsewhere, at $1,200 to $1,500 a year, and 

 vacancies in positions requiring similar qualifications, at these or 

 higher or lower salaries, will be filled from this examination, unless 

 filled by reinstatement, transfer, or promotion. 



Competitors will be rated in the following optional subjects, and 

 applicants should state in which of these subjects they desire to 

 qualify : Rubber technology ; leather technology- ; paper tech- 

 nology ; textile technology ; oil technology ; general technolog}-. 



Applicants should at once apply for Form 1312, stating the title 

 of the examination desired, to the Civil Service Commission, 

 Washington, D. C. ; the secretary of the United States Civil Serv- 

 ice Board, Customhouse, Boston, Massachusetts ; New York, New 

 York ; New Orleans, Louisiana ; Honolulu, Hawaii ; Post Office, 

 Philadelphia, Pennsylvania; .'\tlanta, Georgia; Cincinnati, Ohio; 

 Chicago, Illinois ; St. Paul, Minnesota : Seattle, Washington ; San 

 Francisco, California; Old Customhouse, St. Louis, Missouri; Ad- 

 ministration Building, Balboa Heights, Canal Zone ; or to the chair- 

 man of the Porto Rican Civil Service Commission, San Juan, Porto 

 Rico. 



.Applications should be properly executed, excluding the medical 

 certificate, and must be filed with the Civil Service Commission, 

 Washington, D. C, prior to the hour of closing business on May 

 10, 1921. 



HEVEA PLANTATIONS IN THE CONGO 



According to a report by the SocifixE Anonyme Bung6, the 

 following quantities of rubber arrived at Antwerp: 



During 1919— first quarter, nothing; second quarter, nothing; 

 third quarter, 5,719 kilos; fourth quarter. 1.829 kilos; total, 7,548 

 kilos. 



During 1920 — first quarter, 7,711 kilos; second quarter, 19,361 

 kilos; third quarter, 17,559 kilos; fourth quarter, 12,553 kilos; 

 total, 57,184 kilos. 



These quantities come almost exclusively from the plantations 

 of the Belgica at the island Bertha, from the Forminiere at Lake 

 Leopold II, and from the government plantation at Yangambi. 



