I919.I 



THE INDIA ^IWBER WORLD 



izing the mixUire. (.Sheldon P. Thachcr, VVeehawken, New Jer- 

 sey, assignor to Revere Rubber Co., Providence, R. I., United 

 States patent No. 1,312,144.) 



Method of Recovering Rubber Solvent in the manufacture 

 of articles by the dipping method. The dipping form, coated 

 with the rubber solution, is passed though a bath which is 

 mutually soluble with the rubber solvent but not with the rub- 

 ber. The Solvent is recovered from the bath by agitating the 

 latter with oil. permitting the mixture to settle and separate, 

 the solvent being taken up by the oil. (John D. Morron, Lake- 

 wood, Ohio, assignor to The Mechanical Rubber Co., New York 

 City. United Stales patent No. 1,312.452.) 



THE DOMINION OF CANADA. 



Process for Regener.-\ting Vulc.vnized Rubber by which linely 

 divided rubber is heated in an oil-jacketed vessel, after removal 

 of its contained air by vacuum, to a uniform high temperature. 

 (The Dunlop Co., Limited, assignee of Douglas F. Twiss, both of 

 P,irmingham, Warwick, England. Canadian patent No. 192,356.) 



ViLCANizixG Process. An accelerator for the vulcanization 

 of rubber consisting of an alkali metal dissolved in a fluid or 

 readily fusible organic hydroxy-compound other than glycerol 

 or glycol and of predominant hydroxylic character, such as butyl 

 or amyl alcohol or an aromatic hydroxy-compound such as 

 phenol. (The Dunlop Rubber Co., Limited. Westminster. Lon- 

 don, assignee of D. F. Twiss, Sutton Coldfield, Warwick, both in 

 England. Canadian patent No. 192,470.) 



THE UNITED KINGDOM. 



Lamp Black is rendered dustless by mixing with water to 

 form a paste, adding 2/5 per cent of resin oil, and then heating 

 to drive oflf the water. (E. L. Curbishley, Wood Lea, Albert 

 Road, Cheadle Hulme, Cheshire. British patent No. 127,770.) 



VuLCANizABLE PLASTIC COMPOSITION. Example of proportions 

 is: 60 parts of reclaimed rubber, 30 parts of leather waste, and 

 10 parts of ground tire cover. The product may be used as a 

 substitute for leather or for solid tires, floor coverings, engine 

 packing, pump valves, etc. (W. S. Smith, The Drive, Fulham 

 Road, London. British patent No. 127,932.) 



Cement for the repair of apertures in submerged ships con- 

 sists of five parts by weight of crude rubber dissolved in naph- 

 tha; three parts of rosin; two parts of white lead; nine parts 

 of coal pitch; and one-quarter part of shellac. The mixture is 

 used hot to cement metal surfaces and may be applied to cloth 

 to form an adhesive patch. It may be thinned with naphtha and 

 used as a paint. (V. Revello, 28 George street, CardifT, Glamor- 

 ganshire. British patent No. 128,755.) 



GERMANY. 



Regeneration of Vulcanized Rubber is effected by heating the 

 material to a high temperature without melting, in a vacuum 

 or in an inert gas. The harmful effect of the air on heated rub- 

 ber is avoided by rapid cooling by treatment with cold water 

 or solutions of sodium carbonate or alkali. (B. J. F. Varinhorst. 

 The Hague, and J. G. Fol, Delft, Netherlands. German patent 

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



Process of Separating Fibrous Materials from Vulcanized 

 Rubber Goods. The material is finely divided and stirred for a 

 short time with slightly warm water. The fibers become wet 

 more easily than the rubber and sink, while the rubber particles 

 float and are skimmed off the surface. (W. Golombek, Span- 

 dau, German patent No. 303,171, June 24. 1916. 



OTHER CHEMICAL PATENTS. 



THE FRENCH REPUBLIC. 



NO. 490,730. Process of making a product to repl, 

 and other .similar substances. Naamlooze 

 landsche Maatschappij tot Exploitate va 

 492.I40. Process of manufacturing a substance having caoutchouc as 

 base. The Goodyear Tire & Rubber Co., Akron, Ohi( 



LABORATORY APPARATUS. 



ALUNDU.M CRUCIBLES AND THIMBLES. 



ALUNDUM is an electric furnace product of exccpti.nally 

 high melting point. It is made of fusing the extremely 

 refractory mineral, bauxite, a natural hydrate of alumina, or a 

 pure aluminum oxide in an electric fur- 

 nace of the arc type. The refractor>- ma- 

 terial thus produced contains from 92 per 

 com to practically pure aluminum oxide, 

 depending upon the material fused. .\Iun- 

 dum not only has a high melting point, 

 Init it is not easily affected by chemicals 

 and has a high heat conductivity. 



.Alundum is also prepared in various 

 pcjrous forms for laboratory use in liltra- 

 tii)n and for extracting soaps, fats, food, 

 rubber, etc., by both organic and inorganic 

 M.lvents, after the arrangement shown in 

 the illustration. (Norton Co., Worcester, 

 .Massachusetts.) 



ELECTRIC HEATER FOR THE DISTILLATION 

 OF GASOLINE. 



The instrument shown in the illustration 

 is constructed according to a new idea in 

 electric heaters designed in accordance 

 with suggestion of Dr. E. W. Dean, of the 

 United Stales Bureau of Mines. 



The spiral heating coil of nichrome wire 

 is inserted in a conical spiral groove, turned 

 in a solid block of insulating material. The separate 

 turns of wire are in contact with the insulating block 

 for only a small part of their circumference and, as 

 a result, practically no heat is wasted by absorption in the 

 block. The conical shape of the depression in the block, com- 

 bined with the high heat-radiating qualities of the material ii-ed, 

 causes practically all of the heat to be focused upon the U^-inch 



Electrical Gasi 



ItATER. 



opening in the transite top of the heater. As a result the liask 

 containing the gasoline is subjected to an intense heat (sufficient 

 to ignite paper immediately) without the danger of breakage 

 due to contact with a bare flame or a red hot coil. A variable 

 rheostat is mounted in the same case with the heating coil, per- 

 mitteing the temperature to be raised or lowered at will. An 

 enlarged view, and partly in section, is shown in the illustration. 

 Many additional uses will be found for this device in the 

 laboratory, as it furnishes a rapid and efficient source of con- 

 centrated heat which will be found preferable to a gas flame 

 for many operations. (Central Scientific Co., 460 East Ohio 

 street, Chicago. Illinois.) 



, bakclite, 



lap Ncdcr- 



Optimiekfabricken. 



Dr. .a. van Rossem will teach the chemistry and technology 

 of rubber in the department of chemical technology in the Tech- 

 nical High School, at Delft, Holland. 



