The Bridgeport evening farmer., 1911-05-27
KNOCKS FOR
 OTHERS

from the same tree without mater tally injuring or shortening its life. as long as the work is done proper ly. Unfortunately many thous- ands of trees are annually rendered useless by careless and improper methods. Although the source of crude rubber gum is practically inex- haustible, the difficulties of securin < native labor and of shipping the pro
 duct out of the country, make it very expensive to obtain Besfdes this the Brazilian Government Isv1es an export duty of 23 per cent. on ev- cry pound shipped from the country This brings that Government in a. revenue of about fifteen to twenty million dollars a year which fs a. large percentage of it's total income.
 In Africa and other sections rubber IS obtained from roots, grasses, shrubs, etc, and reaches the factory In the form of small Jumps, but this rubber Is of an inferior grade and Is used principally in making other pro- ducts than tires.
 When crude rubber reaches ths tire factory 1t is placed between en- ormous rollers and pressed out into thin sheets. ali the time subjected to constant stream of water to wash out all foreign substances. These sheets after being hung up several weeks to dry, are ready Co compound with sulphur and other ingredients in the manufacture of tires.
 In making solid tires the com pounded rubber is placed In one ard of receptacle and forced out ths other end in the desired shape.
 Next to rubber the most important material in pneumatic tire s the fabric which gives form and r1gfHtv upon a tire that for this purpose the higher priced tires use only the best grade of Sea Island cotton, as ft has the longest and stoutest fibre.
 Many people who have never visit ed a rubber factory get the frnpres- sion that rubber is heated and then poured into mould. This is not true. Rubber is never, under any circumstances poured, as it IS. too sol~ i'd a mass and 1t is never heated very hot until 1t is made into the proper shape and form it will retain fin use.
 In making pneumatic tires the tire IS built up on a. round form just the shape and size of the inside of the tire. It is composed of layer upon layer of special cotton fabric and rubber
 These materials are very expen- sive, but here the quality of material and workmanship counts the utmost and the extra grade of materials and workmanship put into Ffrestone tires at this stage adds greatly to the mile age the tire VIII give It TeU6VS the extra cost of good many times over in extra miles of service.
 A great amount of time, thought and energy have been devoted by ex~ perts and inventors to combine rub- Der and cotton fabric into a good wearing autom obile tire and to de- velop the tire into it's present stage of perfection. Since the first patent of this kind was issued on May Stf1. 1847, nearly 2,000 patents have besn granted on pneumatic tixes. to say nothing of patents on solid and cush- ion tires.
 All tires look so much alike in outward appearances that an inex- tect the great difference that a su- perior quality makes in the wear. This always shows up in mileage given.
 The United States takes just one half of the worlds total output of crude rubber and half of this goes to Akron, Ohio, where about two thirds of all tires are made and about $125, 100000 is invested in rub Der manufacture.
 Some rubber companies divide their attention over a multitude Jf products but one concern The Fire stone Tire 6 Rubber Co, concen- rates all effort and energy upon per- lection In tires exclusively. making no other goods. This company has become the largest exclusive tire ma- xer in America.