THE INDIA RUBBER WORLD 



CHEMICAL PATENTS. 



THE UNITED STATES. 



LIQUID CcMiNG CoMiosmoN. — .\ liiiuid coating composition 

 comprising linseed oil, rosin, gutta percha, gum arabic, shel- 

 lac and gasoline in prescribed proportions. (Frank Picard, Fall 

 River, Mass. United States patent No. 1,281,650.) 



C.\T.\LVST. — .As a new catalyst for hardening oils, finely divided 

 poreless native amorphous silica of the character of that occur- 

 ring in asbestos deposits, such silica being of a fineness as high 

 as 40O-mesh and carrying reduced nickel. (.Alexander Sch ware- 

 man, assignor to Kellogg Products, Inc., both of Buffalo, N. Y. 

 United States patent No. 1,282,297.) 



Rubber Compositio.n" .xnd Method. — Vulcanized compositions 

 and products of light color, which comprises incorporating with 

 a vulcanizable ingredient of the composition to be vulcanized, a 

 light-colored semi -solid to solid bitumen, obtainable by the de- 

 structive distillation of coal-tar pitch, and subjecting the compo- 

 sition to vulcanization. (John M. Weiss, assignor to The Bar- 

 rett Co., both of New York Cily. United States patent No. 

 1,282,505.) 



GERMANY. 



Regener.'MINg of Vulcanized Rubber. — The regeneration of 



soft vulcanized rubber is effected as follows : Vulcanized rubber 

 s heated to a high temperature,' without melting, in a vacuum or 

 n an inert gas, and the harmful effect of the air on heated rubber 

 s avoided by rapid cooling; for example, by treatment with cold 



water, or solutions of sodium carbonate or alkali. (B. J. F. 



Varenhorst, The Hague, and J. G. Fol, Dell, Netherland Indies. 



German patent No. 302,995, March 19, 1914.) 



THE DOMINION OF CANADA. 



Process of Making Rubber Sponges. — A process for pro- 

 ducing an antimony-colored rubber sponge of low specific 

 gravity comprising a batch of material including chiefly rub- 

 ber, to which is added a softening agent, sulphuret of an- 

 timony, a rubber substitute and a softening medium con- 

 taining a blowing agent acting late in the period of vulcan- 

 ization, and a softening medium acting when cold to stiffen 

 the mass and having substantially no retarding effect upon 

 the reformation of the mass during vulcanization. With this 

 mass is mixed a body-forming medium of low specific grav- 

 ity, the main blowing agent and an ingredient for retarding 

 the blowing action in the first stages of vulcanization. This 

 mixing is worked until it reaches the consistency of soft 

 putty and after aging is formed into the desired shape and 

 vulcanized. The cured article is mechanically compressed to 

 break its unbroken cell walls, and finished by trimming oft' 

 the skin, exposing the porous body. (The Miller Rubber Co., 

 assignee of Richard Griffith and Charles F. Flemming — all 

 of .Akron, Ohio, U. S. A. Canadian patent No. 186,291.) 



THE UNITED KINGDOM. 



Le-ather Substitutes. — \ coarse felt impregnated and covered 

 with a mixture of leather powder, vulcanized rubber powder, and 

 free sulphur heated to a semi-liquid state, with which may be 

 incorporated rosin, sodium silicate, and coloring matter. .After 

 mixture and heating, the material is forced in semi-liquid condi- 

 tion into the open pores and coated on the surface of coarse felt 

 and cooled until solid. (J. Ward, 31 Gratton Road, Queen's 

 Park, Bedford, England. British patent No. 119,304.) 



Tire Puncture Composition. — A composition for sealing pneu- 

 matic tires, etc., consisting of the following ingredients, the pre- 

 ferred proportions being as stated, namely : water, two quarts ; 

 granulated cork, four ounces ; powdered cork, two ounces ; talc, 

 one pound ; white lead, eight ounces, and gum arabic, two ounces. 

 (W. P. Thompson, 6 Lord street, Liverpool, England. [Puncture 

 Cure, Limited, 19 Union Bank Building. Calgary, Canada.] Brit- 

 ish patent No. 119,324.) 



LABORATORY APPARATUS. 



BURETTE-CALIBRATING PIPETTE. 



A.^ri-:C1.\L burctte-calibraliu:^ pipette has been perfected by 

 C. W. Foulk, of the Department of Chemistry, Ohio State 

 University, Columbus, Ohio, and interestingly described by him 

 in a reprint from an article originally published in 

 of Industrial and Engineering Chemistry," 

 .August, 1915, page 689. Tlie illustration 

 shows the pipette attached to the outlet of a 

 burette to be calibrated. .All previously 

 described burettes of this sort have had a 

 mark on the lower stem which served as a 

 zero point. In the present instance it is 

 evident, as the accompanying figure will il- 

 lustrate, that if the pipette has previously 

 filled and emptied, the fiow will begin at the 

 top of the boring through the plug of the 

 cock at A. Thus the point A is a zero mark 

 to which the adjustment of liquid is auto- 

 matically regulated by the position of the 

 cock. This zero point is more accurate than 

 a mark around the lower stem would be on 

 account of the boring. (The 

 Kauffman-Lattimer Company, Co- 

 lumbus, Ohio.) 



A NEW COMBUSTION BULB. 

 .A very convenient and easily 

 cleaned combustion bulb is here 

 shown. It is extremely simple in construction 

 and has no stop-cocks to work loose and leak, 

 or stick tight and cause breakage by attempted 

 removal. It weighs al)out 125 grams when fully 

 charged and has a demonstrated capacity of 

 absorbing up to four grams of carbon dioxide 

 without loss when the gas current is flowing at 

 the rate of 500 c.c. per minute. (The Kauffman- 

 Lattimer Co., Columbus, Ohio.) 



Combustion 

 Bulb. 



HIGH VACUUM PUMP. 



The most recent development in high vacuum puinps for 

 laboratory and commercial purposes is represented by the Cenco- 

 Nelson pumps. They are compact, operate with very small ex- 

 penditure of power, require no attention when in operation and 

 V,,,, : ..(,i last indefinitely. They measure 



about seven inches high by five 

 inches in diameter at the base and 

 weigh about ten pounds. The two- 

 stage pump contains two pairs of 

 gears, arranged one above the 

 other. The upper pair takes the air 

 from the inlet tube and delivers it 

 to the lower pair, which forces it 

 out through the exhaust. The three- 

 stage contains three pairs of gears 

 similarly arranged and produces a 

 higher vacuum. To offset the heat- 

 ing effect in operation a water cir- 

 (Central Scientific Co., 460 East 



High V.'^cuum Pump. 



culation system is provided 

 Ohio street, Chicago, Illinois.) 



BARIO. 

 Bario metal is a successful substitute for platinum for labora- 

 tory crucibles and other utensils. Bario is a brilliant grayish- 

 white, non-magnetic metal, melting at 3100 degrees F. and 

 upwards, according to grade. It is not attacked by nitric, 

 sulphuric, hydrochloric, hydrofluoric, acetic or oxalic acids, nor 

 by alkalies, sea water, ammonia, iodine, etc. (The Bario Metal 

 Corp., 167 West 18th street. New York City.) 



