500 



THE INDIA RUBBER WORLD 



April 1, 1921 



Rotary Compressor W'ith- 

 ouT Motor 



main itovernor, when the speed rises to about 15 per cent above 

 normal. 



The steam passes through the lirst stage nozzles, from the 

 steam chest, the nozzles being opened, or closed, as required by 

 hand valves placed in the steam chest. The governors control 

 the flow of steam to all nozzles. — The General Electric Co., 

 Schenectady, Xew York. 



TOY BALJ-OON INFLATING DEVICE 



One of the simplest devices for intlatiiig toy balloons is 

 a small rotary air compressor, connected direct to a small motor. 

 arranged for either alternate or direct current. The tnotor 



armature and parts of the com- 

 pressor shown herewith are fully 

 protected by the steel casement in 

 which they are enclosed. The com- 

 pressing clement of the compressor 

 is also enveloped by a cast steel 

 body, and is complete with a steel 

 shaft. Both are supplied with a 

 licavy base, and finished in black 

 enamel. The pressure of air varies 

 with the speed at which the com- 

 pressor is driven. The volume of 

 air depends upon the type of the machines, which are made in 

 three sizes, all of which can be made to drive from 500 to 1600 

 r.p.m. The minimum pressure of the smallest size is three 

 pounds, while the maximum pressure of the largest is thirty- 

 two pounds. The pressure to be used is naturally determined by 

 the quantity of balloons to be inflated daily and the quickness 

 with which the operator works. — Anderson Electric & Equipment 

 Co., 154-160 Whiting street, Chicago. 



SELF-LOADING ELECTRIC TRUCK 



The principal feature of this all-steel electric truck with a 

 capacity of five thousand pounds, which commends it to rubber 

 manufacturers, is ihe fact that it is self-loading and offers 



many possibili- 

 ties for saving 

 both time and 

 labor in han- 

 dling crude rub- 

 ber and other 

 materials in 

 bulk, or carry- 

 ing cores and 

 molds about the 

 plant. 



.•\s shown in 

 the illustration, 

 the loading plat- 

 form is in front 

 of the truck and 

 runs on small 



wheels. The lifting mechanism is operated by an independent, 

 heavy-duty, series-wound motor and worm-gear reduction. The 

 platform lifts vertically, the ri.se being 4}4 inches. It can be 

 stopped at any point in the rise or descent by the operator, who 

 stands on the platform at the back of the truck and controls the 

 lifting mechanism with a foot-pedal. It is stated that three sec- 

 onds are sufficient for full lowering, and five or six for eleva- 

 tion, depending upon the size and number of batteries used. The 

 back of the truck is fitted with a heavy bumper which takes all 

 shocks and protects the rear end of the lift platform. A draw- 

 bar attachment enables the truck to haul a trailer and act as a 

 light-duty tractor. 



Automatic brake and circuit breaker, four-wheel steer, and single 

 reduction worm-drive of the power axle are the main features of 

 the operating mechanism. The wheels are of heavy steel with 



The Cowan I.ndl'striai. Truck 



solid rubber tires. The length with platform is 102 inches overall, 

 the width is 36 inches overall, and the height is 51 inches over 

 steering shaft head. By folding the foot-pedal and steering handle 

 into a vertical |)osition, the overall length is shortened to 91 "/j 

 inches for use on elevators. The batteries are either alkaline or 

 lead, and the controller is of the drum type, with three speeds 

 forward and three speeds reverse. 



This truck can be used in intersecting aisles 5 feet wide, and 

 the extreme outside point of the turning radius is 7 feet, 10 inches. 

 — Cowan Truck Co., Holyoke, Massachusetts. 



OVERHEAD CARRYING SYSTEM 



.>Vn overhead carrying system is a great time saver in production 

 expense whether a ruiiber plant be large or smali. The illustra- 

 ticm shows a systcin of this sort that is different from the ordi- 

 nary. It meets every condition and requirement and takes the 

 place of the usually heavy, cumbersome and costly / beam and 

 travelling crane and displaces barrows, trucking and other slow, 

 laborious, time-wasting contrivances. Its system of tracks, turn- 

 tables, switches and carriers will go anywhere, curving in and out 



lliiSE Pole Co.wEvnR 



of doors. o\er and around machinery, or from floor to floor, plac- 

 ing the leads exactly where wanted. 



The illustration shows the overhead system used for conveying 

 hose poles in a rubber hose making room. — The Louden Machin- 

 ery Co., Fairfield. Iowa. 



FABRIC KNIFE FOR TIRE REPAIR 



.A very convenient and effective tire repair tool, known as the 

 H. F. safety canvas knife, is shown in the illustration. It holds 

 two adjustable blades which can be set for cutting through fabric 

 without harm to the imderlying plies in the operation of step- 

 ping down stock for re- 

 building or repairing the 

 canvas. The handle of 

 this tool is of ball form, 

 fitting the palm of the 

 hand conveniently for 

 pushing the cutting edges 

 through the rubberized 

 fabric. — Harvey Frost 



& Co 



Safety Fabric Knife 

 Limited, London, England. 



CUTTING PURE RUBBER SHEET 



Pure rubber sheet for making dress shields, bathing caps and 

 similar goods is calendered very thin, and is correspondingly dif- 

 ficult to cut into bands or strips with sharp edges without special 

 machinery. However, when dusted and snugly reroMed on a heavy 

 paper tube, it may be neatly cut in a lathe with a hand knife, pro- 

 vided the precaution is observed to cool the rubber to freezing or 

 below. Under this condition t!ic strip gum will have smooth, un- 



