File:The Dental cosmos (1914) (14581554530).jpg

Identifier: dentalcosmos5619whit (find matches)
Title: The Dental cosmos
Year: 1914 (1910s)
Authors: White, J. D McQuillen, J. H. (John Hugh), 1826-1879 Ziegler, George Jacob, 1821-1895 White, James William, 1826-1891 Kirk, Edward C. (Edward Cameron), 1856-1933 Anthony, L. Pierce (Lovick Pierce), b. 1877
Subjects: Dentistry Dentistry
Publisher: Philadelphia, S. S. White Dental Manufacturing Co
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: The College of Physicians of Philadelphia and the National Endowment for the Humanities

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asit looks, especially when the wheel isrun at a high rate of speed. With theold style of foot-driven lathe there waslittle difficulty, as the wheel could be runin a trough of water without much riskof sparking, or the old-fashioned deviceof a sponge held by the fingers or asponge-holder did quite well, and does sostill, only there are the disadvantages 103G THE DEXTAL COSMOS. associated with holding the sponge andexcessive wetting of the fingers. Thereare several devices which do much tominimize these drawbacks, and these willbe found a marked improvement, both asregards uniformity in the supply ofwater and also in overcoming the objec-tions which result from the holding of tinue using wheels which have gone offthe true. For this, however, there isno excuse, as there are now several ex-cellent devices for truing up wheels. Before leaving the subject of carbo-rundum wheels, a warning is necessarywith regard to their use, which also ap-plies to corundum wheels used for grind- Fig. 93.
Text Appearing After Image:
A B C D Shows some simple hand tools used in the work, a, Countersinker. b, Marker. pliers. D, Sharp-pointed graver. E, Pin-bender. c. Rough i the sponge with the fingers. At the sametime, carborundum will be found to cutfaster dry than does the correspondinggrade and grit of corundum when wet;in point of fact, carborundum cuts, whilecorundum and emery partake more ofthe nature of abraders or rubbers. Itwould seem almost superfluous to addthat true-running wheels are essential toaccuracy in fitting and shaping, butsome find it a great temptation to con- ing any kind of porcelain. That is,always grind toward the edge (Fig. 92),as otherwise there is a danger of splinter-ing the tooth. This precaution must becarefully observed when using largewheels of coarse grit, but applies alsoto the finer and smaller wheels, althoughwith these the danger is diminished.There are certain natural stones—mostlyfreestones, however—which are free fromthis disadvantage and possess the valu- GIRDWOOD. T

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