THE INDIA RUBBER WORLD 



497 



Rubber Viscosity Tester. 



LABORATORY APPARATUS. 

 APPARATUS FOR DETERMINING VISCOSITY OF RUBBER. 

 A NEW MECHANISM for the determination of the viscosity of 

 -** rubber under varj-ing conditions of temperature and pres- 

 sure is here illustrated. 



The apparatus com- 

 prises a cylinder A 

 bracketed to a table and 

 cored out at B for the 

 circulation of steam. A 

 hole runs axially through 

 the cylinder in which at 

 its enlarged lower end a 

 nut C is screwed holding 

 the fixed lower gripping 

 disk D. Gripping disks 

 D and E are provided 

 with radial teeth for en- 

 gaging the test sample 

 F. The upper disk E is j 

 attached to the vertical 

 spindle G, virhich is made 

 to turn by a cord pass- 

 ing around the grooved 

 horizontal pulley H, 

 thence over the pulley I and suspending weight J. The angle 

 of rotation is indicated by a pointer K attached to the horizontal 

 pulley H. The location of the pointer is adjustable by the thumb 

 nut L. The pressure upon the sample F under test is regulated 

 by weights M placed over the extension of the spindle. 



Stocks of a certain grade should show^ a definite trav.el for 

 known conditions of pressure, torsion, temperature and time, 

 these being known for standard stocks, a comparison of 

 samples is easy. It is the viscosity of the rubber which per- 

 mits the larger part of the movement indicated on the scale. 



The coefficient of viscosity may be determined directly by this 

 apparatus. A calibration chart can be prepared, showing 

 the coefficient of viscosity corresponding to different amounts 

 -of travel of the pointer in a unit of time for different condi- 

 tions of pressure, torsion and temperature, and, those con- 

 ditions being known and the travel of the pointer determined, 

 the coefficient of viscosity for the sample in hand may be 

 read directly from the chart. (^Ralph B. Naylor, Springfield, 

 assignor to The Fisk Rubber Co., Chicopee Falls — both in 

 'Massachusetts, Ignited States patent No. 1,327,838.) 



SOLDERLESS TERMINALS. 



Electrical connections that are intended to be permanent or 

 perfect or both, are made by the use of solder. Such a connec- 

 :tion, however, is subject to impairment when under strain. 



DIRICItONS FOR INSTALLING 'MELIORATE' TERMINALS 



No I • Twi si the copper strands, insert and bend mre asAown 



struction and method of use are clearly shown in the illustra- 

 tion. Polarity is indicated by a black or red sleeve of a hard, 

 strongly dielectric material that can withstand the hardest usage. 

 (Standard Scientific Co., 70 Fifth avenue. New York.) 



CHEMICAL PATENTS. 



THE UNITED STATES. 



I EATHEROiD AND PROCESS OF -MANLh ACTURE, comprising an ad- 

 *—• mixiure of leather, rubber, casein and an alkali earth metal 

 oxide. (Bernhard Fritzsch, Cincinnati, Ohio. United States 

 patent No. 1,334,297.) 



Method of Reclai.minc Rubber, consisting in dividing the 

 rubber into pieces, placing it loosely in a chamber, expelling the 

 air from the chamber by the injection of steam under pressure, 

 and heating the rubber while in a loose condition in the chamber 

 by an externally applied source of heat. (Douglas Frank Twiss, 

 assignor to The Dunlop Rubber Co., Limited— both of Birming- 

 ham, England. United States patent No. 1,335,926.) 



Rubber Product and Compositio.n. As new compositions of 

 matter, solutions containing in a common solvent, more than 

 50 per cent of rubber and from about ten to 30 per cent of a 

 semi-solid to solid bitumen obtainable by the destructive dis- 

 tillation of coal tar pitch, (j'ohn M. Weiss, assignor to the 

 Barrett Co.— both of New York Citv. United States patent 

 No. 1,334,060.) 



THE UNITED KINGDOM. 



Vulcanizable Condexsation Products.— Obtained by passing 

 a vaporized mixture containing dienes such as isoprene, for ex- 

 ample, the mixture of gases and vapors obtained by cracking 

 mineral oil under high pressure, over a heated contact mass 

 (bauxite, fuller's earth, clay, animal or vegetable charcoal, etc.) 

 at a temperature above the melting-point of the resin formed, 

 say from 110 to 250 degrees C; the molten resin is drawn off 

 from the bottom of the contact vessel and solidified. The product 

 is soluble in alcohol or ether, and may be used in the manufac- 

 ture of varnishes, coating compositions, plastic compositions, 

 insulating materials, etc., and may be vulcanized. (Hall Motor 

 Fuel, Limited, Pinners Hall, .\ustin Friars, London, England. 

 [H. V. Dunham. Brattleboro, Vermont. V. S. A.] British patent 

 No. 138.{M6.) 



THE FRENCH REPUBLIC. 



Rubber CoMi'orNH. — .An improved process for the manufac- 

 ture of rubber compoinids. (N. D. Nielsen. French patent No. 

 500.174.) 



AUSTRALIA. 



Rubber Substitute. — The process and iiroduct wliich consists 

 in combining fish oil and sulphur in the presence of heat and 

 resubjecting the resultant combination to heat under pressure. 

 (Morton Gregory, assignor to Western Rubber Co., both of 

 Tacoma, Washington. Australian patent No. 5,882.) 



Preservation of Rubber. — A process for preserving india rub- 

 ber. (F. E. Stowe, New South Wales. .Australian patent No. 

 3,364.) 



GERMANY. 



Sponge Rubber. — Coagulating rubber latex under conditions 

 producing a porous or spong\- coagulum and fixing the pores by 

 vulcanization (Philip Schidrowitz and H. A. Goldsborough, 

 London, Filmland. German patent No. 321,092.) 



No 3 -Force slepve 



The solderless terminal overcomes all the inconveniences 

 inherent in the soldered connector, and is unique in design and 

 execution. It is known as the "Meliorate Terminal," and its con- 



AMERICAN-rviADE FILTER PAPER 



Acid-washed filter paper for quantitative chemical analysis, 

 which paper was formerly imported, is now being made by a 

 small paper-making plant in New England, which is said to have 

 capacity for this purpose more than sufficient to meet the entire 

 American demand. 



