December 1, 1916.' 



THE INDIA RUBBER WORLD 



143 



This machine is recommended for all-round work where the 

 lays are higher. 



It will cut curves or straight lines equally well in material 

 varying from the lightest silk to the heaviest cotton fabric. 



The round knife type shown in the second illustration is 

 also operated on either 110 or 220-volt direct or alternating 

 current. A notable feature of this machine is the standard, 

 which is so arranged that as the knife 

 wears down it can be lowered into 

 the plate. This makes the blade last 

 longer and insures accuracy of work- 

 manship, as the edge of the blade is 

 always kept close to the throat-plate. 

 It has a knife guard which is a pos- 

 itive protection against the operator 

 cutting himself. 



The adjustable sharpening device is 

 arranged so that both sides of the 

 blade are sharpened simultaneously, 

 thereby doing away with any wire 

 , edge on the knife. Moreover, the 

 sliarpening device is adjustable so 

 "that the operator can obtain any kind of bevel he prefers. [East- 

 man Machine Co., Buffalo, New York.] 



THE STURTEVANT DUST GRINDER. 



That the grinding principle of the ancient mill-stone had long 

 since been replaced by newer machines of modern design and 

 construction was a reasonable supposition. That such is not 

 entirely the case, 

 however, is indi- 

 cated by the ac- 

 companying il- 

 lustration of a 

 modern grinder 

 with upper and 

 nether m i 1 1- 

 stones of rock 

 emery. It is the 

 more interesting 

 from the fact of 

 its comparatixely 

 recent adaptation 

 for comminuting 

 hard and soft 

 rubber and grind- 

 ing leather scrap 

 for making 

 leather and rubber soles. 



The upper, or bedstone, is bolted to the top casing and is low- 

 ered with it directly upon the lower, or runner stone. Tlie 

 clamping ring is next tightened to hold the bedstone case and 

 stone immovably in position and the runner is then' lowered 

 away from the bedstone by a hand wheel which regulates the 

 fineness of grinding required. 



As in the old prirtciple the material is fed at the center and 

 is gripped between the mill-stones, passing through a contin- 

 uous rubbing, shredding and tearing action as it works its way 

 by centrifugal force to the periphery where it is discharged into a 

 suitable receptacle. 



A duplicate plant consisting of four 42-inch horizontal mills 

 and four special screens, recently installed, has produced, it is 

 claimed, 12,000 to 13,000 pounds of 40-mesh soft rubber dust 

 per day from one unit. That scrap leather and hard rubber may 

 be successfully ground on this machine is obvious. The 42-inch 

 mill is 5 feet long, 5 feet wide and 5 feet high, weighs 5,500 

 pounds, gross, and requires 18 horse-power. , [Sturtevant Mill 

 Co., Boston, Massachusetts.] 



VirLCANIZER RUCORDING THERMOMETER. 



A new type of thermometer for recording vulcanizing temper- 

 atures up to 800 degrees F., or 425 degrees C. which embraces 

 a number of original features, is shown here. It operates on 

 ■ the principle of the expansion of gas with change in temperature. 

 A bulb of copper containing nitrogen gas under pressure is con- 

 nected to a recording instrument by a small copper tube pro- 

 tected by flexible steel tubing. The 

 recording instrument has a helical 

 spring somewhat similar to that 

 used in pressure gages, and the ex- 

 pansion of the gas in the bulb ex- 

 erts pressure which is conveyed by 

 the capillary tube to the helix, which 

 expands proportionately. 

 This heli.x is directly con- 

 nected to a recording arm 

 and pen which marks on 

 the record chart. Tubing 

 as long as 100 feet can be 

 furnished, if required, so 

 that the recording gage 

 may be placed at some distance from the point where the tem- 

 perature is measured. The clock which revolves the chart is 

 mounted directly on the front plate on which the chart rotates. 

 insuring alinement of the clock and chart plate. 



The clips holding the chart in position are mounted on the 

 door so that when the door is opened they are automatically 

 swung away from the chart, permitting its easy replacement 

 without interference. 



A device is furnished which raises the chart pen from the 

 chart automatically when the door is opened, and frees the 

 pen automatically when the door is closed. 



This instrument is also made in indicating form, where de- 

 sired, to indicate the temperature on a dial instead of recording 

 it on a chart. Several different types of bulbs may be had, 

 either with threaded connection for insertion in mains and 

 pipes, or with lead coating to withstand chemicals and acids. 

 [The Brown Instrument Co., Philadelphia, Pennsylvania.] 



A PORTABLE ELECTRIC TIRE PUMP. 



The Lectroflater principle apparently reduces the annoyance of 

 tire inflation to the minimum. The carriage outfit shown in the 

 illustration is a combination of a universal motor that will run on 



either alternating 

 or direct current, 

 a high- pressure 

 air compressor, a 

 gear box and a 

 condensing cham- 

 ber, so arranged 

 that all elements 

 are enclosed in a 

 single housing 

 and automatically 

 cooled. It is 

 mounted on a 

 strong, light car- 

 riage that is pro- 

 vided with a con- 

 venient tool tray 

 and equipped with 

 four rubber-tired 

 wheels. 



This outfit has been especially designed to meet the demand 

 of public garages, tire sales rooms and other public places which 

 must dispense free air, but wish to avoid the larger investment, 

 higher operating expenses and loss of space required by large 

 compressor and tank systems. 



