474 



THE INDIA RUBBER WORLD 



[June 1. 1914. 



cut and passed through this machine, which spreads a perfectly 

 even coat of cement on one side. These strips art then pressed 

 together, and later cut to the shape required. 



Where cementing is done by hand the volatility and inHain:iia- 

 hility of rubber cement has necessitated inventions to prevent 

 as far as possible the thickening of the cement in the container. 

 An improved cement pot shown has a container shaped somewhat 

 on a spiral, and which revolves partway in a frame. When in 

 use, the square opening presents only small surface for evapora- 

 tion, and when not in use the pot is turned up till it strikes the 

 square plate above, when a clamp seals it air-tight. 



Pure india rubber, whatever its quality, will deteriorate after 

 a while, and as the cements mentioned leave simply a layer of 

 such rubber between the surfaces they are intended to join, such 

 joints are likely, in time, to loosen and separate. Therefore, in 

 the manufacture of rubber goods, which arc afterwards vul- 

 canized, other ingredients are added to allow the thin layer of 

 cement also to be vulcanized, and thus form an actual joint of the 

 same material and similar consistency as that from which the 

 article is made. 



Such cements are used in making soft rubber goods like hot 

 water bottles and fountain syringe bags, and hundreds of articles 

 of like nature; also in the rubber clothing business, where the 

 best work is required. To be sure, coated cloth is purchased cut 

 into shape and stuck with simple cement, but it does not wear 

 long before the cement loses its hold and the garment is worth- 

 less. The more reliable manufacturers use a compound cement, 

 which is vulcanized when the garment is completed. 



As examples of such compound cements the following may be 

 considered as representative : 



Fine Para 89.8 parts 



White Lead 3.4 " 



Litharge 6.8 " 



Sulphur 4.2 



One pound of this compound is used to a gallon of naphtha. 



For rubber-surfaced coats, and for automoliile tire work, the 

 following compound has been found effective and satisfactory : 



Fine Para 24. parts 



Whiting 12. 



Litharge 16. 



Sulphur 1.25 " 



One pound to each gallon of naphtha. 

 A richer cement for the same |)urpose is : 



Fine Para 3i parts 



Litharge 6 " 



Sulphur 3 " 



I'or sole laying and channel cement a good mixture is said 

 to lie: 



Fine Para 2,S parts 



Congo 90 



Lopori 90 " 



Gum Thus IS 



From }/2-pound to 1 pound to the gallon of naphtha. 

 The Gum Thus, or common resin, is added to prevent too rapid 

 drying, but any resinous gum is likely to "cake" on exposed 

 parts and is hard to remove, while purer gum can be rubbed off 

 with the fingers, when it rolls up into small rolls and peels away, 

 where resinous cements stick tightly. 



In the leather goods trade, the hat business, pocketbook making 

 and in many lines where a strong flexible adhesive is needed. 

 nothing fdls the bill quite so satisfactorily as well made rut)l)er 

 cement. 



WHEN MAN IS MADE OF RUBBER. 



The alleged discovery by a Parisian surgeon that rubber 

 can be grafted onto human beings, new organs and members 

 made of that substance taking the place of their natural 

 counteri)arts. is referred to in the editorial columns of this 

 issue with all the seriousness that the subject seems to de- 



A Doctor Is Grafting Rubber Into Human Beings. 



niand. This discovery appears to have made a strong appeal 

 to the artist of the "Chicago Daily Tribune," who sets forth 

 in a series of illustrations — reproduced in somewhat con- 

 densed form below' — tlie many marked advantages that will 

 accrue to human beings when the rubber grafting process 

 becomes general. 



.\ novelty for the bathing beaches has l)een introduced for 

 the coming season in the form of dolls with red rubber cos- 

 tuu'.es and cork stuffing. 



RUBBER COMPANY SHARE QUOTATIONS. 



The following market quotations of the shares of rubber manu- 

 facturing companies onMay 20 last are furnished by John Burn- 

 ham & Co., 31 Nassau street. New York, and 41 South La Salle 

 street, Chicago : 



Bid. .\sked. 



Ajax-Grieb Rubber Co.. Common 21 .S 



Ajax-Grieb Rubber Co., Preferred 99 



Firestone Tire & Rubber Co.. Common 302 307 



Firestone Tire & Rubber Co., Preferred laS 110 



B. F. Goodrich Co., Common 25/^ 26'^ 



B. F. Goodrich Co., Preferred 89j4 90^. 



Goodyear Tire & Rubber Co.. Connnon 177 182 



Goodyear Tire & Rubber Co.. Preferred 98 100 



Kelly-Springfield Tire Co., Common 51 53 



Kelly-Springfield Tire Co., Preferred 132 137 



Miller Rubber Co 130 135 



Portage Rubber Co., Common 40 



Portage Rul)ber Co., Preferred 90 



Rubber Goods Mfg. Co., Preferred 100 110 



Swinehart Tire Co 65 70 



V. S. Rubber Co., Common 59 .59'4 



V. S. Rubber Co.. 1st Preferred 102^ 103 



