26 



THE INDIA RUBBER WORLD 



[October 1, 1911. 



Table II. — German Crude Rubber Statistics. 



German Imports. 

 Double 



centners. Tons. 



1890 38,893 3,889 



1893 51,993 5,199 



1896 82,804 8,280 



1899 137,037 13,704 



1902 150,288 15,029 



1905 213,930 21,393 



1908 249,885 24,980 



1910 333,149 33,316 



German Exports. 

 Double 



centners. Tons. 

 8,578 

 11,621 

 19,078 

 54,088 

 62,360 

 78,506 

 68,605 

 101,357 



858 

 1,162 

 1,908 

 5,409 

 6,236 

 7,850 

 6,860 

 10,136 



German 

 Consumption 

 Double 

 centners 



30,315 



40.372 



63,726 



82,949 



87,928 

 135,424 

 181,280 

 231,792 



Tons. 



3,031 



4,037 



6,373 



8,295 



8,793 



13,542 



18,128 



23,179 



Table IV.— German Exports of Rubber Manufactures. 



Marks. 



1890 24,621,000 



1892' 21,822,000 



1894'. '. 19,441,000 



1896 26,134,000 



1898' 45,136,000 



1900 43,081,000 



1902^ 37,756,000 



1904 52,948,000 



1906- '■ '. 56,685,000 



1908 58,178,000 



1910! '. 66,854,000 



Dollars. 



6,155,250 



5,455,500 



4,860,250 



6,503,500 



11,284,000 



10,770,250 



9,439,000 



13,237,000 



14,171,200 



14,544.500 



16,713,500 



THE HILL PUMP VALVE. 



The distinctive features of the Hill pump valve are brought 

 out very well by the accompanying illustration. This valve is 

 made with a bronze back into which rubber, metallic or com- 

 position discs are inserted with a view to meeting all pump 



•^"■L PUMP VALVE 



valve requirements, such as boiler feed, cold water, hydraulic, 

 or oil. The discs are renewable and are held in place by a 

 binder ring. These discs, supported and strengthened by the 

 bronze body, form a perfect seal on the outer and inner circle 

 of the seat so that no matter which way the valve may rotate 

 it cannot ride on the bridges, thus preventing slipping and the 

 trouble of constantly replacing the valves. [The Hill Pump 

 Valve Company, Chicago, Illinois.] 



first was a mechanical mixture but with the aid of heat you pro- 

 duce a chemical combination of the three, and the chemist has 

 not yet been found who can return bread to flour, water and 

 yeast. 



"Take another combination, take a quantity of iron filings and 

 sulphur; mix them together and you have a mechanical mixture 

 of iron and sulphur, but if you place that mixture where there 

 is sufficient heat the sulphur melts and combines with the iron 

 and produces a new material which is neither iron nor sulphur, 

 but a chemical combination called sulphide of iron. 



"So it is with rubber ; we take a certain amount of crude gum 

 and add sulphur. We place this mixture of sulphur and rubber in 

 a heater; when the temperature rises to a certain point the sulphur 

 melts and becomes volatile, and at once begins to combine with 

 the rubber, and after a certain length of time we have a new 

 product — rubber such as the general public knows. It is elastic 

 now, whereas before it was like putty, and although numerous 

 chemists are continually at work trying to find a means of re- 

 storing vulcanized rubber to its unvulcanized state, no one as 

 yet has been able to do it. 



A MACKINTOSH 



Cap with Curtain. 

 that can be let down arnum 



WITH KNEE EXTENSIONS. 



The motorcyclist can now 

 enjoy his machine regardless of 

 weather, for a storm coat has 

 been devised which has exten- 

 sions which when not needed 

 are buttoned up inside the coat, 

 but when needed can be let 

 down and drawn down over the 

 knee and held there by a strap. 

 The accompanying illustration 

 shows the coat with one of these 

 knee extensions dropped down 

 ready for use and the other 

 buttoned up inside the coat. 



From the same English 



source comes a leather cap with 



a rubberized fold or curtain 



1 the back of the head, protecting 



RUBBER AND BREAD MAKING. 



A. D. Thornton, superintendent of the Canadian Consolidated 

 Rubber Co., Limited, once so plainly explained the "change" that 

 vulcanization effects in rubber that it would be an excellent idea 

 for rubber men to memorize his illustration for use when they 

 are obliged to talk rubber to non-technical investigators. He 

 said: "If you take flour and mix it with cold water and add a 

 little yeast you have a mixture of flour, water and yeast, nothing 

 else, but, if you place the mixture in a hot oven for a certain 

 length of time you will produce bread, which is neither flour, the ears and the neck. (Dunlop Rubber Co., Ltd., Birmmg- 

 water nor yeast but a chemical combination of the three. The ham, England.) 



Mackintosh Coat with Knee Covers. 



