Identifier: dentalreviewdevo3119unse (find matches)
Title: Dental review; devoted to the advancement of dentistry.
Year: 1917 (1910s)
Authors:
Subjects: Dentistry
Publisher: Chicago, Dental review company 1887-(1918)
Contributing Library: Columbia University Libraries
Digitizing Sponsor: National Endowment for the Humanities (NEH)

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oint, clamp D, at apex of hypothenuse.It must be seen that here we have X, Z hypothenuse, beingmeasured in terms Y, Z base. The more closely G, H, I, approaches clamp D, the morenumber of turns of the actuating screw, C, would it require tocomplete a mm. distance, hence we have, a constantly increasingnumber of micro-millimeter divisions to each millimeter, as thedistance between bridge abutments decreases. Fig 8 presents three mandrels, 13, 14 and 15 gauge (Brown& Sharpe). They are used for carrying platinum tubes, A, B, Cof corresponding diameters, the malls of these tubes are .007 ofan inch in thickness. These mandrels are locked into the bodyof the parallelometer, one on each section, into clamp D, on sec-tion A, and into clamp G, H, I, as the case may call for on sec-tion B. They are always perpendicular to the horizontal plane of themeter and the tubes placed upon these mandrels will thereforebe parallel to each other. As the actuating screw C, is turned forward or backward,
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102 THE DENTAL REVIEW the distance between these mandrels will be decreased or in-creased as the case may be. Split pins, rendered somewhat eliptical in form made ofhighly platinized clasp metal and of corresponding diameters,frictionally engage the platinum tubes, and form the retentivepart of what is known as the split pin and tube attachment (Fig.8, D, E, F), used on upper cuspids and centrals and lower cuspids. Fig. 9 shows the mandrel to be held in the parallelometer forcarrying an attachment used on posterior teeth. By virtue of itsconstruction, as seen at A, B and C it is capable of adjustment inhorizontal, vertical, and circular directions. Fig 10 shows the parallelometer holding two of these man-drels, one in clamp D, section A, and one in clamp I, section B. It also shows a top side view of the platinum hood, K and L.The outside measurements of its width is .042 of an inch, and atop and side view of the plate, or male part of the attachment,M and N. The outside measurements

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