January 1, 1919.] 



THE INDIA RUBBER WORLD 



191 



of 



compound containing 

 ild or plantation rubber. Com- 

 The compound shall be free of 

 1 substitutes. 



shall be a black stock of 

 grey^ stock of specific gravity 



Th. 



and 



the ch 



rubber must be declared wh( 

 gredients known to the rubbe: 

 of a properly cured "tread" sample shall be 

 with a minimum elongation of 400 per cent i 

 by the average of four test pieces when stre 

 per minute. The test pieces shall be cut '/J 

 nds being grad 



ely 



of 



ith test ] 

 3f 350 pe 



90 degrees F, 



(c) Sidewall Stocks. — Use tread stock. 



(d) Retread Semi-cured Bands.— I. 



(e) Cured-back Tube Stock.— The 

 specifications fnr tlie friction ci'at an 



shall be nut less than 0.015 



_,-,., , , of best quality 



Ihe kind and quality of the reclaimed 

 ed. The compound shall be free of in- 

 oil substitutes. The tensile strength 

 nces per square inch 

 cent (2 to 10 inches) as determined 

 ■n stretched at the rate of 20 inches 

 cut ^-inch wide over a gage length 

 lly enlarged to a width of approvi 

 permanent set determined by the average of four 

 above, shall not exceed 30 per cent after an elonga- 

 ! to 9 inchesj for ten minutes, followed by a rest 

 t a temperature between 65 and 



The 



All tests shall be made 



be 



tha 



repaiT tread stock specifications. 



:ured stocks used must fill the 



■ ' ""' e gage of the 



The gage of 

 Vulcai: 



shall 



,d mille 

 weight 

 It. Th 



5f the 



zing Cement. This 

 mum specific gravity 

 ohime of the best quality new 

 tree from ingredients known to the 

 reclaimed rubber. It shall be dis- 

 nd content bv weight to be deter- 

 stant weight, shall be not less than 



3. Ce.ments— Two Cements Only. ( 

 cement shall be made from a compound h; 

 of 1.15 containing at least 75 per cent by 

 wild or plantation rubber and shall be fre 

 rubber trade as oil sut 

 solved in benzol. The 

 mined bv evaporation ai 

 17 per cent of the total 



' s cement to be made from the best quality 

 . with no other ingredients with a benzol 



solvent. The pure rubber content weight to be determined by evaporation 

 and milled to a constant weight, shall be not less than 6 per cent of the 

 total weight of the cement. The acid solution used wtih this cement shall 

 be 2 per cent monochloride of sulphur and 98 per cent benzol. 



4. Cure. The base cure on a 4-inch section for repair material should 

 be based on 45 minutes at 50 pounds steam pressure, it being understood 

 that cure is to be made under proper conditions. 



5. Prices. Repair materials will be purchased on a pound basis. For 

 comparison of different quotations the specific gravity and price on the 

 basis of volume must be submitted by the bidder in addition to the price 

 on a weight basis, it being understood that the volume price shall be the 

 price per square yard of the gage specified in the request for bid. 



6. Vm-vt. Bases. Two sizes designated as large and small will be re- 

 quired. The standard commercial, after sample bases have been submitted 

 to and approved by the Government, will be accepted. 



7. Air Bags. The air bags shall be made according to the standard 

 practice and design of the manufacturer. A sample section of the bag 

 showing the end reinforcement and cross-section of the bag must be sub- 

 mitted to the Government for approval. Bags must be tested with 100 

 pounds air pressure and show no leaks when immersed in water. 



THE FIRST SCREW-FORCING MACHINE. 



■"[""HE well-known screw-forcing or tubing machine has long 

 ■*• been the standard one for forming plastic materials into 

 rods, tubes and an endless variety of other forms in continuous 

 lengths, and may be found in nearly every rubber factory. 



The Editor of "The India-Rubber Journal" wrote interest- 

 ingly (July 7, 1917, page 13) of the introduction of the forcing 

 machine to the rubber industry of Great Britain, remarking 

 as follows: 



The first forcing machines made their appearance in the late 

 'seventies or early 'eighties, and were, we think, the production 

 of a Scotch firm, who had not previously been known as makers 

 of rubber machinery. Some say it was an American invention, 

 but though there are some early American patents referring to 

 it, we do not think it was first made in America. 



In another issue of the same journal (July 28, 1918, page 8), 

 Mr. R. T. Cooke, for Francis Shaw & Company, Limited, 

 communicated the interesting fact that the first British-made 

 forcing machine was designed and made by the late Francis 

 Shaw in 1878-1879, while in the employ of Messrs. Chas. 

 Macintosh & Company. The editor of the "Journal," how- 

 ever, questions these claims of priority, adding: 



On the other hand we have evidence, upon which we based 

 our statement, that the invention was claimed in an altogether 

 different quarter. This point, although small, is interesting, and 

 we shall be glad if any old-time mill managers, or machine 

 makers will give us their views upon it. 



In this connection the following remarks, taken from a 

 letter dated October 30, 1517, written to The India Rubber 

 World by the late William Kiel, indicate that he designed 

 and introduced the tubing machine for rubber working: 



I am pleased to furnish the information that when I was first 

 engaged in the establishment of the Rubber Comb & Jewelry 



Co.'s factory' in 1876, I had a rod and tubing machine con- 

 structed according to my own idea, which machine and duplicates 

 thereof have been in use ever since. Indeed there were many 

 improvements made by machine builders since that date, though 

 the principle of the machine has never changed very materially, 

 but if the Macintosh people had no machine up to 1876, the 

 Rubber Comb & Jewelry Company antedated them by two years. 



The Origixal Kiel Tubing Machine 



We are indebted to Mr. W. Weitling, vice-president of the 

 American Hard Rubber Company, for the accompanying 

 illustration of the machine referred to by Mr. Kiel and the 

 information that it is still in use. 



Co. of which for 



in West Burlington, now Butler, New Jersey 

 led with others to form the present Americ; 

 ears William Kiel was the gener; 



1 his company 

 Hard Rubber 

 superintendent. 



UNITED STATES RUBBER CO.'S SCHOOL FOR FOOTWEAR 

 FACTORY EXECUTIVES. 

 Last spring the United States Rubber Co. inaugurated a school 

 in which to train men selected from its several foot-wear factor- 

 ies for e.xecutive positions, this training to comprise, in the main, 

 time study and job analysis. Neces.sary to success in this field 

 was the use of the slide rule and the intelligent reading of books 

 on the principles of scientific management, and industrial or- 

 ganization. 



This class started in New Haven and was shortly moved to 

 Williamsport, Pennsylvania, taking its quarters in the planning 

 department of the Lycoming Rubber Co. In all, about twenty-five 

 students have been sent to the school. Of this number the follow- 

 ing will complete the course by Christmas and be returned to 

 their respective factories: G. C. Bauer, Shoe Hardware Co., 

 Waterbury, Connecticut; J. F. Curran, Naugatuck Glove Co.,. 

 Naugatuck, Connecticut; G. L. Drown, National India Rubber 

 Co., Bristol, Rhode Island; E. J. Artesani, National India Rub- 

 ber Co., Bristol, Rhode Island; R, J. Ford, Woonsocket Rubber 

 Co., Woonsocket, Rhode Island; H. E. Chitting%vorth, Candee 

 Rubber Co., New Haven, Connecticut; F. P. Goodwin, American 

 Rubber Co., Cambridge, Massachusetts; C. J. Lahr, Wool Boot 

 Rubber Co., Hastings, Michigan; N. A. E. Nelson, Goodyear 

 Metallic Rubber Shoe Co., Naugatuck, Connecticut; W. C. Rob- 

 inson, Candee Rubber Co., New Haven, Connecticut; H. A. Cur 

 tis, Lycoming Rubber Co., Williamsport, Pennsylvania; R. W. Mc- 

 Gregor, United States Rubber Co., New York City. 



Beginning January 1 the school will he moved to New Haven, 

 Connecticut, to occupy new quarters now being prepared in offices 

 of the Candee Rulibcr Co. 



