1916.1 



THE INDIA RUBBER WORLD 



contents diluted with acetone, stirred with a glass rod, and al- 

 lowed to stand. The mineral matter is deposited rapidly and sep- 

 arated by decantation, transferred to a weighed filter-paper, and 

 washed well with acetone. In some cases it is advantageous to 

 wash further with alcohol and chloroform, then to moisten the 

 filter with water so as to obtain a moist and uncaked residue for 

 further examination. Little or no carbon dioxide is eliminated 

 from calcium or magnesium carbonate by boiling for one hour 

 in nitrohoiuciic. 



CHEMICAL TREATMENT OF RUBBER. 



UNITED STATES OF AMERICA. 



Rubber-Like Subst.^xces fro.m Alcohols. 1,161,904. David 

 Spence and Alexander P. Clark, assignors to The B. F. Goodrich 

 Co. — The process consists in heating an alcoholic body (pina- 

 cone) in the presence of a dehydrating agent (acetic anhydride) 

 at such temperature that there is yielded a rubber-like body after 

 prolonged heating. 



UNITED KINGDOM. 



CoAGUL.\TioN OF Latex.— 16,096 (1914). E. Mosinger. Latex 

 is coagulated by the addition of a solution of aluminum, bismuth 

 or zinc chlorides, or mixtures of these. About 1 gram of one 

 or more of these salts is dissolved in 10 c.c. of water, and the 

 solution is stirred into 100 c.c. of latex. The rubber thus pre- 

 pared is said to have physical qualities which considerably im- 

 prove its commercial value. 



Preparation for Coagulating L.\tex. 16,840 (1915). C. de C. 

 Pinto, Para, Brazil. A coagulating preparation consists of a so- 

 lution in alcohol of preferably 2 kilos of creosote, 1 kilo of quinine 

 hydrochloride and 1 gram of sodium carbonate, which is diluted 

 with water or the whey of rubber latex. It is recommended that 

 10 grams of this solution be used with 200 grams of whey for 

 coagulating 2 kilos of latex. 



Synthetic Caoutchouc Substances. 17,253 (1915). A. 

 Heinemann. — The polymerization of butadiene, isoprene, di- 

 methylhitadiene, and other hydrocarbons having double bonds, is 

 affected by dissolving them in acetone or one of its homologues 

 and passing sulphur dioxide into the solution. The product is 

 freed from oily impurities by subjecting it to high pressure in a 

 mold. It may be vulcanized or n\ixed with metal oxides or other 

 tillers. 



THE GERMAN EMPIRE. 



Process for Obtaining Pure Butodiene. 286,640 (April 25, 

 1913). Bayer & Co. "Butadiene containing gas'' is treated with 

 fluid sulphurous acid for solution of the butadiene. Subsequently 

 purified by evaporation and caustic soda. 



OTHER CHEMICAL PATENTS. 



UNITED STATES OF AMERICA. 

 ISSUED NOVEMBER 16, 1915. 



1.160.362. Method of making a plastic body. L. H. Baekeland, Yonkers 



N. Y., assignor to General Hakelite Co., New Vork. 



1.160.363. Waterproof article of manufacture. L. H. Baekeland, Yonkers 



N. v., assignor to General Hakelite Co., New York. 

 1.160,365. Method of making a paper-like product. L. H. Baekeland, Yon 

 kers. N. Y'., assignor to General Bakelite Co., New York. 



THE GERMAN EMFIRE. 

 PATENT ISSUED (With Date of Validity). 



288,968 (June 3, 1914). _Pr( 

 Hugo Bayer, V ien 

 Berlin, SW 68. 



THE FRENCH REPUBLIC. 

 PATENTS ISSUED (With Dates of Application). 

 476,662 (December 7, 1914). New use of rubber in footwear. J. J. Sausett. 

 476,526 (December 22). Vulcanized fiber sole for footwear. P. Rouanne. 

 476,990 (December 8). Improved treads for elastic tires. W. Henry. 

 476,995 (May 18). Product serving to jirevent the deflation of pneumatic 

 tires. Robin du Brcuil. 



LABORATORY APPARATUS. 



TORSION BALANCES FOR WEIGHT AND YARDAGE OF FABRICS. 



IX every rubber factory where textile fabrics are components of 

 *■ the manufactured goods, as for example, those making foot- 

 w^ear, automobile tires or proofed goods, it is a matter of con- 

 stant interest and importance to keep track of fabric weights and 

 3'ardage and the rubberizing upon them, expressed in weight per 

 yard, or yardage per pound. Simple and direct means for making 

 these determinations are available in two adaptations of the sensi- 

 tive torsion balance. 



WEIGHT TO THE RUNNING YARD OF FABRIC. 

 The balance for determining the weight in ounces or grams of 

 a running yard of fabric is provided with a carrier and graduated 

 scale upon which an accurately cut sample, 2x2 inches, of the 

 fabric to be tested is 

 £2~_[.7'i* •'.";■■ -.^"^^ttt^ held in place by a wire 



clip. The right edge of 

 this sample must be set 

 e.xactly at the graduation 

 on the carrier that cor- 

 responds with the width 

 of the cloth. The scale 

 is then brought to bal- 

 ance by iTieans of the 

 slide weight on the beam. 

 The beam graduation 

 thus indicated is the 

 weight in ounces or grams of the running yard or meter of the 

 fabric. The graduations read to the fifth of an ounce, or to five 

 grams. YARDS TO THE POUND OF FABRIC. 



The yardage of fabric to the pound is correlative to the weight 

 per yard and is determined by a second special balance. In this 

 instance the sample of 

 fabric is cut 3x3 inches. 

 The right edge of the 

 sample is adjusted ex- 

 actly at the graduation 

 on the carrier, shown in 

 front of the scale box, f 

 that corresponds witli ' ^„ 

 the width of the labric. ' 



The scale is then brought 

 to balance by means of 

 the slide w-eights on the 

 beams. If the scale does 

 not balance with the up- 

 per slide weight at the extreme right, tlien the weighing is con- 

 tinued with the lower weight, leaving the upper one to the ex- 

 treme right. The position of the weight when the scale balances 

 indicates the number of yards per pound of sample. [The Torsion 

 Balance Co., 92 Reade street. New York.] 



iWATER SUPPLY EXTRACTION APPARATUS. 



I ^ ^ This form of extraction apparatus is compact, 



"■ ~* sitnple and efficient. 



It is also inex- 

 pensive and dur- 

 able. All rubber, 

 cork, ground 

 glass or mercury 



Hi 



' a 1 connections 

 jeliminated. The 

 is sufficiently 

 to be accur- 

 weighed, is 

 easily cleaned and 

 of such form that 

 the extract can be transferred. The condenser is entirely of 

 ■tal. I Kinur iS: .\inend. New York.] 



