([ory ana me laouraiury 

 ;-k together. I am familiar 

 (h, and can help you work 

 i problems. Complete model 

 I experimental work. 



ICKJ.MAYWALD.F.C.S. 



iSVLTISG CHEMIST 

 New York 

 rj John 



Fmiaded 1837 



Oi*\l^J^ tV^ 1315 ILIS. K^y 



BOSTON, MASS. Inc. I 



Manufactararv ol 

 DIVING DRESSES WAOINO PA 



MOULDED GOODS CEME 



UNVULCANIZED GUMS OP ALL KINDS 

 Rubber flashed. Dried, Treated and Sha 



Reg. United Kingdom. 



Edited by HENRY C. PEARSON— Offices, No. 23 Wert 45th Street, NEW YORK. 



Vol. LVI. No. 4. 



JULY 1. 1917 



35 cr^TS. 



$3.00 Per Year. 

 $3.50 Abroad. 



(^^t^ 



«EC^U.3. PAT. OFK 



The Faultless Rubber Company 



ASHLAND. OHIO, U. S. A. 



Manufacturers of 



Rubber Sundries — Water Bottles— Syringes— Surgical 

 Rubber Goods — Surgeons', Household and Electri- 

 cians' Rubber Gloves— Sponges — Sponge Products- 

 Transparent Nipples— Tubing — Finger Cots — Balls — 

 Balloons — Toys — Novelties — Bathing Caps — Etc 



Under These Trade Marks 



C^^ KViamer" rhallengp 



5»e. 



LAMPBLACKS ESPECIALLY FOR RUBBER MANUFACTURE 



SAMUEL CABOT, INC., BOSTON. MASS. 



V ISLA.ND 



T'l TTV:* 



R. J.CALDWELL CO.,Inc 



IVIILLS AX 

 DAINJIELSON, CONN, 



