Dental Advertiser . and Coupling for Dental Engines.—David E. Coulson, Galesburg, Ills. Fine Moulding Sand. A SUPERIOR. QUALITY OR FINEMOULDING SAND, PREPARED BY Stye <§f?ase /T\etallie Qombi^atior; pia^ <?o. THIS sand is put up in tin cans holding two quarts, and is ready for* immediate use. It requires no water. It is unquestionably thebest sand for dental purposes ever offered. Price - - - 75 Cents per FILING POST FOR WORK-BENCH. The cut illustrates a post for resting the piece of work upon while filing, scraping or finishing. It will be found to be a great con-venience,
Dental Advertiser . and Coupling for Dental Engines.—David E. Coulson, Galesburg, Ills. Fine Moulding Sand. A SUPERIOR. QUALITY OR FINEMOULDING SAND, PREPARED BY Stye <§f?ase /T\etallie Qombi^atior; pia^ <?o. THIS sand is put up in tin cans holding two quarts, and is ready for* immediate use. It requires no water. It is unquestionably thebest sand for dental purposes ever offered. Price - - - 75 Cents per FILING POST FOR WORK-BENCH. The cut illustrates a post for resting the piece of work upon while filing, scraping or finishing. It will be found to be a great con-venience, as it can be adjusted or removed in-stantly, leaving the top of the bench free andunobstructed. Fig. 4 in the cut represents the socket mortised1 in the edge of the work-bench. Fig. 2 is theshank partly withdrawn. Fig. 3 is the latchto hold the shank in position; it must be liftedbefore the shank can be removed. Fig. I is themaple wood top, or filing post proper; the otherparts are made of 75 PRICE, IFOIR S-A-ZCIE ZB-5T W. R. HALL & SON, 47 North Thirteenth St., PHILADELPHIA, PA., OR THE BUFFALO DENTAL MANUFACTURING COMPANY. THE Dental Advertiser Vol. XXL—BUFFALO, N. Y., OCTOBER, 1890.—No. 4. NEW METHOD OF VULCANIZING RUBBER PLATES. BY GEORGE B. SNOW, D. D. S., BUFFALO, N. Y. In The Dental Advertiser for 1887, the subject of shrinkage ofrubber during the vulcanizing process was discussed at some length. Itwas shown that during the process of hardening, a mass of rubber com-pound experienced an actual decrease in bulk, its specific gravity beingconsiderably increased. The expansion of rubber by heat also receivedsome notice, and the following experiment was suggested, as affordingproof of the facts asserted : Let a cube of unvulcanized rubber compound be made of abou:inch dimensions. It may easily be built up of squares cut from asheet of gum. Let it be invested in plaster in a dental flask, by placing iton a bed of soft plaster and immediately filli
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Keywords: ., bookcentury1800, bookdecade1870, bookiddentaladvert, bookyear1876
