906 



THE INDIA RUBBER WORLD 



September 1, 1921 



tween the halves of the mold are inserted between the bead 

 plates to adjust them to the proper sizes. Long steel pressure 

 bolts permit the use of a sand-bag and spring when curing spots 

 on the tread and save the use of an air-bag for full sectional 

 repairs. 



The vulcanizers derive steam from a special high-power steel- 

 riveted generator composed of H and ^4-inch metal and numer- 

 ous tubular flues. It is equipped with all safety devices necessary 

 to pass inspection requirements anywhere in the United States. — 

 Western Rubber Mold Co., 243 North Crawford avenue, Chicago, 

 Illinois. 



CIRCULAR MANDRELS 

 The advantage of circular mandrels for the manufacture of 

 inner tubes is very evident 

 from the fact that tubes so 

 made fit the casing and are 

 entirely free from buckling on 

 the inner circumference, due 

 to their annular form. The 

 illustration pictures an inner- 

 tube mandrel mounted on a 

 holder or wrapping stand. The 

 mandrel is made of 13-gage 

 seamless drawn steel tubing, 

 sherardized and highly pol- 

 ished as furnished ready for 

 immediate use. Such tubes 

 are made in regular sizes 

 from 28 by 3 up to 37 by S Circul.vr Mandrel and Stand 

 and larger sizes to order. — Roessing Manufacturing Co., Sharps- 

 burg Station, Pittsburgh, Pennsylvania. 



tually prevents troublesome short circuits and grounds. — Blake 

 Signal & Manufacturing Co., Boston, Massachusetts. 



RELIABLE TEMPERATURE REGULATOR 



The illustration shows a temperature regulator known as the 

 "Sylphon" for the automatic regulation of 

 liquid or air temperature and can be used in 

 practically every case where steam is the heat- 

 ing medium as in dry heaters or open-steam 

 vulcanizers. The regulator is entirely self- 

 contained, automatic, sensitive and accurate in 

 regulation to a degree, and depends only upon 

 the power generated within itself for operation. 

 It comprises a heat-sensitive bulb, which is 

 inserted into the space or medimn to be 

 heated; a flexible tubing for connection of the 

 bulb to the regulator; a motor chamber for 

 multiplying the force developed in the bulb 

 and transmitting it to the valve in the steam 

 line; and an adjustable mechanism for setting 

 the regulator at the desired temperature. The 

 instrument is made in both lever and spring 

 Sylphon type of construction. — The Fulton Co., Knox- 

 Regulator ville, Tennessee. 



STAPLES FOR ELECTRIC WIRING 



For quick and convenient attachment of telephone or bell wires 

 in laboratory or factory, the insulated staples shown in the illus- 



«6 



POLISHING AND FINISHING MACHINE 



The illustration shows a duplex polishing 

 and finishing machine adapted for finishing 

 cylindrical objects in metal, fiber, rubber, 

 wood, etc. The work in long or short 

 lengths may be fed through the machine 

 automatically by a power-feed attachment. 

 Small articles of cylindrical form may be 

 fed automatically through hopper fixtures. 



The abrasive belt is 6 inches wide by 

 14 feet long, made endless, and is run over 

 a cushion leather belt. It is this feature 

 that gives the machine its remarkable ef- 

 ficiency as a light grinding, polishing, and 

 finishing tool. 



.\ machine of this sort should find an 

 important place of usefulness as a means 

 of keeping tube-poles clean and polished 

 in a rubber tire factory where inner tubes 

 are made. — Production Machine Co., Green- 

 field, Massachusetts. 



Machine for Pol- 

 ishing Inner- 

 Tube Poles 



TESTING TIRE-BUNDLING PAPER 



The Mullen tester is designed for determining the strength of 

 paper by applying a hydraulic bursting pressure. The instrument 

 is standard among paper manufacturers and dealers, and with the 



United States and 

 various foreign gov- 

 ernments. Its use is 

 required by the re- 

 vised tire - bundling 

 specifications that were 

 published in The India 

 Rubber World, April 

 1, 1921. 



The ordinary form 

 of Mullen tester is 

 shown in the illustra- 

 tion, and consists of a 

 cylinder with a side 

 opening over w h i c h 

 the paper to be tested 

 is clamped. By means of a hand-wheel hydraulic pressure is 

 exerted upon the area exposed to test and the bursting pressure 

 in pounds per square inch automatically indicated on a pressure 

 gage. A rubber diaphragm is interposed between the paper 

 under test and the liquid in the cylinder. The instrument is 

 made in two sizes to cover a range of tests up to 1,000 pounds 

 per square inch, — B. F. Perkins & Son, Inc., Holyoke, Massa- 

 chusetts. 



The Mullen Tester 



A 



Blake Insulated Staples 

 tration are very desirable and useful. The fiber insulation efTec- 



MACHINERY PATENTS 

 TIRE BUILDING MACHINE 



TIRE carcass is customarily built up by applying strips of 

 rubberized fabric to the core, usually by hand. The inven- 

 tion shown in the accompanying illustrations eliminates unneces- 

 sary steps and efifects the convenient and easy application of the 

 chafing strips and side-walls. 



The machine comprises a pedestal supporting a strip-applying 

 device drawing material from rolls arranged on a frame above, 

 and delivering it accurately positioned and rolled down on the 

 carcass built on a revolving core. The strip-applying device is 

 mounted on an independent support movable on wheels on a 



