May 1, 1920] 



THE INDIA RUBBER WORLD 



501 



AUTOMATIC MACHINE FOR WEIGHING RUBBER INGREDIENTS. 



In "Rubber Machinery." by Henry C. Pearson, the possibilities 

 of an automatic machine for weighing compounding ingredients 

 was suggested. "It is a 

 swift, accurate and secretive 

 weighing mechanism which 

 worlds faster than any ex- 

 pert human weigher. The 

 suggestion is that a gang of 

 these machines could han- 

 dle the ingredients that go 

 to make up a compound, 

 one machine to weigh whit- 

 ing, another litharge, still 

 another sulphur, and so on. 

 Each machine takes its ma- 

 terial from a bin, weighs it 

 and delivers it into a com- 

 mon pan." 



The realization of this 

 prophecy is shown in the 

 two illustrations herewith- 

 one of the actual machine 

 and the other, an installa- 

 AuTOMATic Pigment Weigher, tion plan of several ma- 

 chines. Each machine automatically weighs a different ingredi- 

 ent and discharges it into the compound boxes as they pass under 



MAGNETIC CHUCKS. 



Milling, planing, grinding and turning machines are now being 

 equipped with magnetic chucks that have fully demonstrated 

 their superiority over the old-fashioned jaw-chucks. 



An interesting development is the use of magnetic chucks lor 

 grinding rubber gaskets and hard rubber electrical products. 

 This is accomplished by two steel plates provided with "V" 

 slots that grip the work through action of the magnetic chuck 

 on the steel plate. This will be more readily understood by 

 reference to accompanying illustration. This particular work is 



Secti 



.Six-G.WG Compound Weighing Inst.\ll.\tion. 



each machine, (Automatic Weighing Machine Co.. Newark, 

 New Jersey.) 



PEERLESS DUPLEX HACK-SAW BLADES. 



This radical improvement in hack-saw blades consists in fine 

 teeth at the toe and coarser teeth at the heel of the blades. The 

 advantages of this design are obvious to every hack-saw user. 

 At the beginning of the cut and on each succeeding stroke, the 

 f^ne teeth at the toe of the blade cut easily and true at the slow 

 starting speed, preparing the way for the faster cutting of the 

 coarser teeth which com.- into play at high speed, as the rest of 

 the blade enters the work. 



Peerless duplex blades are made in two types; all hard tung- 

 sten steel and flexible carbon steel. The former is especially 

 adapted for use by tool makers in cutting tough steels, and by 

 expert mechanics for general use. 



The carbon steel flexible type is hardened on the tooth edge 

 cnlv. The remainder of the blade is only toughened to prevent 

 excess stretch when tensioned. In plumbing, electrical and steam- 

 fitting work, or in other trades where the material to be cut is 

 of thin, irregular section, and where the work cannot be held 

 rigidly in a vise or reached from an easy sawing position, it is 

 the first choice of all good workmen. (Peerless Machine Co., 

 Racine, Wisconsin.') 



Steel V-Plafes Held 



Magneiically and in Turn Gripping 

 the Non- Magnetic Work 



Rubber G.\skkts or Hard Rubber Articles Held in Magnetic 

 Chuck of Surface Grinder. 



carried out on rotary surface grinders that are arranged with 

 rotary magnetic chucks and are very accurate and fast for this 

 class of work. (The Heald Machine Co., Worcester, Massa- 

 chusetts.) 



PORTABLE ELEVATOR OR PILING MACHINE. 



This portable elevator for elevating cases, bales, barrels, etc., 

 for piling purposes, is a combined hand and motor operated 

 machine. l! is similar in construction to hand-operated and 

 motor-operated portable elevators, but is equipped with a crank 

 lor hand operation, and with a. small 

 motor, the cord and plug of which may 

 he conveniently attached to an ordinary 

 lamp socket. The motor is small 

 enough to be thrown directly on the 

 line without the use of a starting box 

 and is controlled by a simple knife- 

 switch mounted on the elevator. The 

 change from one form of operation to 

 the other may be instantly effected. 



The advantage of thi» 

 feature is apparent. The 

 elevator may be operated 

 by motor wherever current 

 i.s available and by hand in 

 those odd corners of the 

 plant where current is un- 

 available. When operating 

 by motor the manual labor 

 of cranking is eliminated 

 and a load as heavy a« 

 1,800 pounds may be 

 raised at approximately 

 three times the speed at- 

 tained by the average man operating by hand. 



The machine may be furnished with any one of three different 

 types of bases, revolvable, non-revolvable, or open and lor use 

 in connection with skids. The motor attachment may be fur- 



TnE Combination Revolvator. 



