384 



THE INDIA RUBBER WORLD 



[Ai'Kii. 1, 1917. 



at a very higi. i<>u >.i speed. The cutting is done by the edge 

 of the part of the elliptical cutter with the greatest radius re- 

 volving against the work. As it revolves, the cut is finished 

 and when the part of the cutter with the least radius arrives 

 opposite the revolving mandrel, clearance is thereby provided 

 and the carriages are moved longitudinally for a fresh cut. 

 The movement of the carriages that determines the thickness 

 of the jar rings is automatically controlled by an intermittent 

 worm gearing and star wheel mechanism together with change 

 gears. When the cutting is completed, the machine is stopped 

 automatically. It is claimed that this machine will pro- 

 duce approximately si.x hundred jar rings per minute. 



A very nec- 

 essary machine 

 i n connection 

 with the jar 

 ring lathe is 

 the alternating 

 knife grinder 

 shown in Fig. 

 7, specially de- 

 signed for ac- 

 curately grind- 

 ing the ellipti- 

 cal knives. It 

 consists of two. 

 o p p ositely 



Fig. 



7. — E;.i,iPTic.\L Knife Grlxuer. 



placed, belt-driven emery wheels that travel toward each other. 

 At right angles to the emery wheel shafts are the rocking centers 

 between which the cutter arbor and cutter to be ground is placed. 

 The arbor is revolved by belt-driven gearing and at the same 

 time being rocked by a cam movement so that the elliptical edge 

 of the knife is presented to the rapidly revolving emery wheels 

 and accurately ground. 



WASTE MATERIAL DEALERS MEET. 



THE fourth annual meeting and dinner of the National As- 

 sociation of Waste Material Dealers was held at the Hotel 

 Astor, New York City, March 20 and 21. Louis Birkenstein, of 

 S. Birkenstein & Sons. Chicago, Illinois, and New York City, 

 officiated at the meeting, and in his address gave an enthusiastic 

 account of the four years' history of the association. The elec- 

 tion resulted in the choice- of the follow'ing officers : Louis 

 Birkenstein, president; H. H. Cummings, James Rosenberg, E. A. 

 Stone, Henry Lissberger, Ivan Reiter and James J. Ryan, vice- 

 presidents; Mark Sherwin, treasurer; Charles M. Haskins, secre- 

 tary. 



.At a meeting of the Scrap Rubber Division held March 20, 

 with Paul Loewenthal, of Brooklyn, New York, chairman, it was 

 voted that The Rubber Association of America, Inc., be requested 

 to have a committee meet the Classification Committee of this 

 division for the purpose of drawing up specifications of scrap 

 rubber which would be adopted by both organizations and should 

 be standard for the trade ; and that the secretary address a letter 

 to the Rubber Association along the lines of the above motion. 



There was considerable discussion as to the buying of mixed 

 tires, the consensus of opinion being that this was a matter which 

 would have to remedy itself and that there was no way for this 

 association to control the buying of its members. 



President Birkenstein also presided at the banquet held on the 

 evening of the twenty-first, and made a ringing address which 

 was enthusiastically applauded. Joseph F. McLean, of the Pe- 

 quanoc Rubber Co., Butler, New Jersey, spoke of the valuable 

 services which the waste material industry is rendering the coun- 

 try's manufacturing interests, alluding to the friendly relations 

 existing between the rubber reclaimers and the scrap rubber 

 trade. Hon. E. C. Stokes, former Governor of New Jersey, gave 



a very 'interesting and witty address and a fine eulogy of the 

 waste material industry. 



.'\ pleasant feature of the occasion was the presentation of a 

 handsome silver loving cup to President Louis Birkenstein by 

 the members of the executive committee. 



A. S. T. M. RUBBER NOMENCLATURE. 



""PHE American Society for Testing Materials will liold its 

 ■*■ annual meeting in Atlantic City, New Jersey, during the 

 week beginning June 25, 1917. In accordance with a resolution 

 passed two years ago, there has been appointed a sub-committee 

 on "Definitions for Rubber Products and Nomenclature of Crude 

 Rubber Varieties,"' with Dr. Frederic Dannerth as chairman. 

 This committee will present a preliminary report of its work at 

 tlie Juno meeting. 



The committee has prepared the following list of terms, and 

 it is desirous of securing criticisms from the technical men of 

 the ruiibcr industry, with special regard to' any additions or 

 omissions which should be made. 



GROUP I. 

 Fine Fara rubber 

 Medium Para rubber 

 Coarse Para rubber ■ 

 Para rubber 

 hicvca rubber (wild^ 

 Plantation smulved sheets 

 Machine smoked sheets 

 ]'irst latex crepe 

 Brown crepe 

 Crude rubber 

 V^'ashed and dried rubber 

 Kcliiied or broken-down rubber 

 Deresinated ridiber 



GROUP II. 

 Scrap rubber 

 Reclaimed rub])er 

 .Mkali reclaimed rubber 

 riigl}-grade reclaimed rubber 

 Floating reclaimed rubber 

 White substitute 

 Brown substitute 

 Rubber resins 

 Pitch hydrocarbon 



GROUP III. 

 Green stock 

 Rubber cement 

 \ulcanized rubber 

 Backing 



Friction compound 

 Skim ply 

 Cushion 

 Bead 

 Tread 



GROUP IV. 

 Rubher 



Rubber hydrocarbon 

 Synthetic rubber 



GROUP V. 

 P.alata 

 Chicle 



Gutta percha 

 Guayule 

 Pontianak 

 Assam rubber 

 Caucho ball 

 C"sf'Hca rubber 

 Manicoba rubber 

 Mangabeira rubber 

 .African rubber 



GROUP VI. 



( i-O' t-i.eu teims not reconunended for -\merican usage.) 

 Plantation Para rubber Irdia rubber 



l"ine hard cure Para Caoutchouc 



The object of the committee in preparing this list of standard 

 terms used in the American rubber industry is to place on record 

 approved definitions for these terms as they are recognized in 

 the American rubber trade, at this time. 



The definitions should represent trade usage ; should contain 

 no historical matter ; should be so clear and concise that they 

 can be used in case of dispute between buyer and seller; should 

 be adopted for use in expert testimony for the courts. 



As an example of the value of such standard definitions the 

 committee mentions the case of balata, which is at present im- 

 ported as rubber (free of duty), while chicle pays a duty of IS 

 cents and 20 cents. The tendency in such cases is to enter chicle 

 under the name of balata. 



NEW JERSEY ZINC CO.'S ANNOUNCEMENT. 



The New Jersey Zinc Co., New York City, announces the 



following prices on Florence brand, French process, zinc oxide, 



for shipment on contract, during the second three months of 



1917: 



Carloads. Less Carloads. 



White Seal cents 16 16'/s 



Green Seal liVi 15^ 



Red Seal 15 15!4 



The above prices are based upon shipments in barrels f . o. b. 



shipping point with freight allowance as heretofore on carload 



lots only. The above prices are effective .April 1, 1917, and are 



subject to change without notice. 



