August i, 1905.] 



THE INDIA RUBBER "WORLD 



361 



THE BLENDED RUBBER FROM PARA. 



W-Fo^ 



Fnblisbed on the 1st of each Month bj 



TllH INDIA RUBBIiR PUBLISHING CO. 



No. 150 NASSAU ST.. NEW YORK. 



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 Entered at New York Post Office as mail matter of tbe second-class. 



TABLfc OF CONTENTS. 



PAOB. 



XAitorlal: 



Tlie HIended Kubber from Far:l 361 



■• SI nilla Hiniilibus Curantur." 362 



M'nor Edilorlal 362 



The General Rubber Company 364 



[With Portrait of William M. Ivins.l 



A New Source of Amazon Rubber LouxsH.Aymi 365 



The"Guayule" Rubber Plant— II Rudolf Endlich, I'll. P. 367 



[\Ietlii>ds of Extraction — Productive Capacity.] 



Drawbacks of the Rubber Trade 369 



The Rubber Factories of Japan 370 



Jottings by an American in Europe— III A. M.SlicUney 371 



|A Great Rubber Factory in France.] 

 The India Rubber Tradein Great Britain Our Regular Corruponaenl 373 

 [State of Trade. A Pneumatic Tire Development. New Rubber 

 Scrap Maciiine. Uses for Old Rubber. The Red Rubber Scare. 

 New Flotations. The Decline of Barter. The Swedish Rubber 

 Trade. The Golf Ball Trial, New Workhou'ie Task. Waterproof 

 Trade in Canada. Devulcani/ing Patents. New Firm ] 



New Goods and Specialties in Rubber. 376 



[The Barker Massage Machine. A Serviceable Ice Creeper. A New 

 Tire Fastening. Duff's Ring Grip for Golf Boots, The " Sure Foot' 

 Rubber Horseshoe. The '* Wedge Lap" Robe for Automobilists. 

 The .\rctic Tongue Shield. I 



[With 7 Illustrations.] 



Progress in Rubber Planting 377 



iCeylon, Java, Mexico.] 



Recent Rubber Patents 378 



[United Stiites. Great Britain. France, Germany.] 



Summer Outing of the New England Rubber Club 381 



[With I Illustration.) 



Rubber Interests in Europe 383 



[Increase in Capital of the " Continental." Dunlop Tyre Reorgani- 

 zation. New Flotations ] 



Views of Mr. E. V. Carey 384 



[Rubber Men in Ameiica. The Marliet for Cultivated Rubber.] 



Obituary 385 



[With Portrait of Amasa A, Marks.) 



Miscellaneous : 



Tbe Uboro Planting Companies 362 



Mawing Guttapercha from Leaves '.. ' 363 



New Trade Publications 363 



The New Consular Keports . .. 363 



Cuban Imports of Rubber Goods 364 



India-rubber Goods In Commerce 374 



Machine for (irluding Kubber Tiling (J/(t«frn(«d) .'. 376 



Buklt Kajah Rubber Co., Limited 376 



Combination of Rubber :ind Metal 380 



Korm for Seamless Kubber (Joods 380 



"Thermalite 'in Germany .• ,,, 385 



News of the American Rubber Trade 386 



[With I Illustration.] 

 KcTiaw of the Crude Rubber Trade 390 



'T^'IIK po[)ular supposition, or more accurately, belief, 

 ^ that " I'ard rubber," fine and coarse, is the product 

 solely of trees of the Hevea species, is likely to receive a 

 rude shock when the results of the investigations of Pro- 

 fessor Henri Jumelle and Dr. Jacques Huber, discussed 

 by Mr. Consul .Aymt; on another page this month, become 

 better known. 



The discovery that there may be and probably is but 

 little really pure Para rubber (that is, Hcvea Para), but 

 that what the manufacturers have been receiving is made 

 from the mixture of \\\.^latices of the Heveas and a Sapium, 

 leads to many interesting speculations. The valuation of 

 Amazonian rubber heretofore has been based very largely 

 upon its dryness, but even then there were not wanting 

 manufacturers to accept or reject certain lots because 

 their experience had taught them that certain physical 

 qualities point to difference in value for specific uses. 

 There have been those, too, who have claimed that the in- 

 troduction ol fai-inha flour by the rubber gatherer has de- 

 cidedly injured certain lots. 



.^t the same time, in the face of any such adulteration 

 as that just mentioned, and in spite of the fact that much 

 of the Para rubber now appears to be the product of a 

 blend, that rubber stands to-day as the unit of value in 

 crude rubber measurement. The question that naturally 

 arises, therefore, is this : Does such a blend produce a 

 better quality of rubber than if the product were wholly 

 from the Hevea Biasiliensis or from the Sapiuni acuparium? 



A careful reading of Dr. Ruber's report leaves this point 

 indeterminate, the evidence leaning, however, slightly in 

 the direction of a conclusion that smoked rubber from the 

 Sapium would show less tensile strength than smoked rub- 

 ber from Hevea. Nor can any particular light be thrown 

 on this interesting subject by the rubber gatherers them- 

 selves, who don't know and don't care to know about such 

 differences, or by the white men employed in rubber 

 houses up the Amazon, whose interests do not touch in- 

 vestigation of this sort. 



In this connection, it is possible that the belief that the 

 lack of tensile strength in the Para rubber from the Far 

 East comes from the immaturity of the trees or the method 

 of coagulating may be misleading. It may be that the 

 mi.xture of the lafex of the Sa/'iiim with that /ale.x would 

 produce an exact replica of Amazonian Pari. Further than 

 this. Dr. Ruber's communication opens up a field for val- 

 uable experiment in the blending of the latices of the Cas- 

 ti/Ioa, the Fictis, the i\fa?iihof, and many others that would 

 undoubtedly produce interesting results and possibly new 

 grades of rubber of varying values. 



It must not be thought that it is only up the Amazon 

 that the latex of various rubber producers is mixed. It is 

 a well known fact that the latices of various kinds of Lan- 

 dolphia are mixed together by the natives, and that the 

 product is not nearly as good as if they were coagulated 

 separately. This, however, is because different kinds need 

 different methods of coagulation, and it is probable that if 

 the coagulation were done by a centrifugal, it would be as 



