REPORT OP NATIONAL, MUSEUM, 1924 99 



of " Hudson seal." And to the Vandeweghe Fur Co., New York 

 City, through the same bureau, the Museum is indebted for 10 spec- 

 imens of rabbit skins illustrating four processes in the conversion 

 of a rabbit skin into " Sealine " or "Arctic seal." 



As the first of a series of exhibits to show the most important 

 kinds of leather, the Museum received as a gift from the Barnet 

 Leather Co. (Inc.), New York, 1ST. Y., five skins representing the 

 principal steps in the chrome method of tanning calfskins for shoe 

 uppers. The Fabrikoid division of E. I. du Pont de Nemours & 

 Co. (Inc.), Newburgh, N. Y., contributed 13 articles, including 

 traveling and golf bags, bookbindings, slippers, etc., to illustrate the 

 application of Fabrikoid, a leather substitute, and to supplement the 

 process exhibit of this material contributed by it last year. 



Other important additions to the National Collections during the* 

 year, also from the field of industrial chemistry, were represented 

 in a group of new materials which are fast finding their places in 

 industry because of special chemical and physical properties. Under 

 this heading should be mentioned 64 specimens showing the manu- 

 facture and applications of Insulate, a hot-molded shellac com- 

 position made by mixing shellac with various fillers and molding 

 in heated steel forms under pressure to any shape or size. This ma- 

 terial finds a place in more than a score of different industries and 

 is used for making parts of musical instruments, electrical and me- 

 chanical equipment, dental instruments, automobiles, cameras, furni- 

 ture, pipes, etc., and was contributed by the General Insulate Co., 

 of Brooklyn, N. Y. 



The Bakelite Corporation, of New York, N. Y., contributed 14 

 specimens manufactured from Eedmanol, a synthetic product related 

 to Bakelite and Condensite, to supplement the exhibits of those two 

 materials which were contributed in 1923. 



From the Diamond State Fibre Co., Bridgeport, Pa., there were 

 received by gift 97 specimens illustrating the use of Celoron, a 

 laminated fiber product thoroughly impregnated with a combina- 

 tion of phenol and formaldehyde and hardened, and which may be 

 punched, shaved, sheared, turned, sawed, drilled, milled, planed, 

 threaded, engraved, etc., in the same way metal is machined. The 

 specimens included automobile and radio parts, gears, pinions, etc. 



The Cutler-Hammer Manufacturing Co., Milwaukee, Wis., pre- 

 sented 55 specimens showing the composition and application of 

 two cold-molded plastics, Pyroplax and Thermoplax. The first, a 

 fire-resisting product made with an inorganic binder and filler, is 

 used for such things as motor terminal blocks and covers, switch 

 and rheostat bases, panel boards, etc. Thermoplax is made with an 

 organic binder and asbestos, has great dielectric strength, takes a 



