o30 



THE INDIA RUBBER WORLD 



[June i, 1909. 



In estimating the cost of treatment for guayiilc it will be as- 

 sumed that guayulc yielding 60 per cent, of purified gum may be 

 purchased for 30 cents per pound. The materials' cost would 

 be found from the fact that 10 pounds of crude would yield 

 6 pounds of purified at a cost of $3, or 60 cents per pound for 

 purified rubber. .-Vs there is so much less resin to be dis- 

 solved, the cost for solvents may be placed at 3 cents per 

 pound, and the working costs would be less, as there would 

 be so much greater finished product per pound of raw ma- 

 terial worked, so that this item may be safely placed at 3 

 cents per pound. This would give a cost of 62 cents per 

 pound for finished product. This shows that at the prices 

 assumed guayule would produce purified gum at less cost than 

 Pontianak. 



Of course prices are continually varying, and these crude 

 products are not of uniform grade, so that the foregoing as- 

 sumptions, while they may not represent the market at the 

 time of publication, or be representative of particular sam- 

 ples, yet they are useful as a basis of calculation. The resin 

 from guayule is of a totally different character from that of 

 Pontianak. 



Here a slight digression will be made to correct some erroneous 

 statements which are frequently made. These statements 

 usually are to the eflfect that rosin is frequently added 

 to rubber mixtures, so why remove resins and then add more 

 rosin. These statements and deductions proceed from a careless 

 use of words. The ordinary rosin is colophony, the product 

 of the long leaf pine, and it is a resin, but all resins are not 

 rosin or colophony, and many differ in almost every way 

 from rosin. Therefore while rosin is a resin, a resin is not 

 necessarily rosin, or anything approaching or having the 

 qualities required of colophony rosin. If the resins found 

 in the brand of rubber used have the qualities desired in the 

 product to be made then the resins in the crude gum are de- 

 sirable, but if not their removal is necessary. 



Pontianak resin is hard and vitreous, not being completely 

 melted at the boiling point of water, while guayule resin is liquid 

 or tarry at ordinary temperatures. In a future article some 

 information will be given as to the utilization of these resins. 



'mmiM^i'Si 



A STOCK WORM COOLER. 



\ 



-( 



N 



/ 



THE forcing of stock through tubing 

 and insulating machines develops 

 much frictional heat, especially toward the 

 forward end of the stock worm. With par- 

 ticularly sensitive compounds this may 

 cause vulcanization, and make delivery diffi- 

 cult or impossible. In small-bore machines 

 the cooling arrangements of the cylinder 

 generally suffice to counteract the effects 

 of friction, but with larger machines the 

 interior of the mass is more distant from 

 the water chambers of the cylinder, and it 

 may become desirable to govern the tem- 

 perature of this portion in some other way. 

 The internal cooling device involves the ' 

 use of a stock worm bored out from the 

 rear almost to the delivery end. It provides 



for injecting a stream of cold water to the point of the worm, 

 and also for its return and discharge. The fixture is readily 

 connected to the water supply. Within the horizontal tube shewn 



is a tube which extends to the point of the stock worm, and 

 there delivers a stream of water. The water flows backward 

 through the annular space between this tube and the stock worm, 

 into the outer horizontal tube, and thence discharges down the 

 upright pipe. To prevent leakage at the ankle a stuffing box is 

 provided. The amount of the circulation should be controlled 

 by a valve at or near the point of connection with the water 

 supply. The cooling device is applicable to Perfected and Im- 

 proved tubing and side-delivery insulating machines. Manufac- 

 tured by John Royle & Sons, Paterson, New Jersey. 



RUBBER NOTES FROM EUROPE. 



BOTH MANUFACTURER AND PLANTER. 



FOLLOWING the recent visit to the rubber planting districts 

 by Mr. Patrick Millar Matthew, managing director of the 

 Victoria Rubber Co., Limited, of Leith. Scotland [see The 

 Indi.v Rubber World, March i, 1909 — page 202] a new planta- 

 tion company has been organized, such action evidently having 

 been influenced by Mr. Matthew's favorable reports upon certain 

 estates in Johore, which are now to be acquired. The new com- 

 pany, Tebrau Rubber Estates (1909), Limited, was registered 

 March 18, at Edinburgh, with ii50,ooo capital. There are 1,530 

 acres planted to rubber, with about 240,000 trees, and tapping is 

 expected to begin two years hence. Mr. Matthew is chairman of 

 the new company. 



BRITISH TRADE NOTES. 



The directors of British Insulated and Helsby Cables, an- 

 nounce a final dividend, making, with the 4 per cent, already 

 paid, 10 per cent, for the last business year. 



An interim dividend of 20 per cent., for six months to February 

 28, was payable on March 8 to shareholders in Stepney Spare 

 Motor Wheel, Limited. 



At the thirtieth annual meeting of W. T. Henley's Telegraph 

 Works Co., Limited (London, March i), it was voted that the 

 managing director, Mr. George Sutton, M. i. E. E., be presented 

 with a portrait of himself and a service of plate, to commemorate 

 the twenty-eighth anniversary of his association with the busi- 

 ness, for which purpose the sum of ii,ooo was made available. 



The death is announced of Mr. James R. Bertram, a principal 

 in the Edinburgh firm of James Bertram & Son, Limited, manu- 

 facturers of machinery for the rubber industry on a large scale. 

 The death occurred on February 20. 



The directors of the Dunlop Rubber Co., Limited, announce 

 an interim dividend of 10 shillings per £1 share for the first 

 half of the business year which began September I. For two 

 years past the Dunlnp dividends have been at the rate of 100 

 per cent. 



The Liverpool Rubber Co., Limited, reported an improvement 

 in trading operations for 1908; the dividends were 5 per cent, on 

 the non-cumulative preference shares and 2 per cent, on the 

 ordinary. 



The Rulibcr Tanned Leather Co., Limited, registered March 

 16, 1909. with £250,000 capital. To adopt an agreement with the 

 Rubber Tanning Syndicate, Limited, and to carry on the business 

 of tanners by any process, including tanning with rubber. 

 Registered office : 235, Finsbury Pavement House, E. C, London. 

 Craigpark Electric Cable Co., Limited (Glasgow, Scotland), 

 report net profit for the year ending March I, 1909. of £6,344 

 [=$30,873.08]. There was a considerable increase in the volume 

 of business in the cable department, and the golf ball trade has 

 been very satisfactory. Dividends : 6 per cent, each on prefer- 

 ence and ordinary shares. The company was formed in 1903, to 

 succeed an earlier company dating back to 1897. The late Lord 

 Kelvin was consulting engineer. 



It is stated that a Hevca rubber plantation of 200,000 trees 

 has been established by Chinese in lower Borneo. 



