β Scribed by Dring, George
No coin nor oath required. For personal study only.
CHEMISTRY AND INDUBTRY
to this tn?x its future will be jeopnrdiied. This nspcct will, however, bc takcn np inore fully in BIr. Sproxton's mniuiary. Tlio bulk of our t u r p i t i u e oil conies froiii the Uiiitetl States, but it c:in also be obtriiiictl froiii France, Spain, Greece, iirid Intliri. In norninl tinics the qncstion is purely ecoiioniic ; in tinics of enicrgcncy it might be ncccssiiry to change the source and use turpciitinc produced nearer home than across the Atlantic.
The celluloid industry is OIIC of tlic oldest and most fully exploited of the plastics industries, and consequently cliangcs in its application arc slow compared with tlosc of sonic of the iiewer plastics. The grerit feature in recent yenrs has bccn the progmssivc reduction in cost clue to n general iiicrctise iii thc cfticicncy of working and improved nicthods of nitrocellulose niaiiufncture. In spite of its inflammability celluloitl has niniiitaincd its usefulness in the face of keen coinpetfition. Its thcrmoplasticity and the case with \vliich it can be colourcd Iitive iriride possible the production of three-, fivc-, and sewnply nlntcrial of nirying colour or trnnsprircncy which lins set np entirely ncw standiirds in :ittrnctiveness. lluny of t.hc developnients of celluloid havc followed the gciicral niovenieiit to'wnrds brighter coloiir coinl~inritions. An interesting rccent devclopiiient which deninnds priniarilg the usc of mtiterial of high iiiecliaiiicnl ~trength :iiitl rigidity, is thc usc of cclluloitl iind ccllulosc iicctatc iii the nianof:icturc of lightning fnstencrs. Tlicsc ~vell-klio\vn fasteners which liil\rc long I>ceii popular in lnetiil ciin UOW be obtained in a variety of plensing colonrs in collulose ester plastic.
The general trend of cellulose acetate ]ins bccn ulong the saiiic lilies 11s celluloid. Ccllulosc ncetiite in this country wis primarily ii war in:iterial, since it o\vcrl its rcjuwnnt,ion if not its birth to the iicctl for n 11011iiiflaniinnble coiiting for iiircrnft in the grciit w r . Sincc tlicii this " uoii-iiiflciiiiiiiiible celluloid," as it is frequently called, liiis inritlc very riipitl progress. I t litis found widc '
π SIMILAR VOLUMES
## Abstract Plasticized graphite (PG)/phenolic resin composites are candidates for positive temperature coefficient resistivity (PTCΟ) thermistors, which are used for selfβrecoverable elements that provide protection from overcurrents, gasoline sensors, and electrostatic charge and electromagnetic