File:Parallelometer;Dental review (1917).jpg

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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ge inlinear adjustment between A and B, Fig. 1. Each metallic section carries three clamps, D, E, F, G, H, I,for holding in place the various mandrels used for carrying thevarious attachments, which a specific case may require, Figs. 1 and 3. The body of the instrument is forty millimeters long. Itslinear dimension may be increased to 55 mm. The upper surface of Section A, Fig. 3, is graduated in mm.form from 1-40, the graduation being continued upon the engagingsurface of the same section, from 35-55 mm. Figs. 4 and. 5. Fig. 6, is an end view of the engaging sections and shows thepositive resistance to any deviation from a perfect horizontal. Fig. 7, shows the parallelometer with five of the clamps in action,illustrating the peculiar system of measurement which enables usto obtain a constantly decreasing unit of measure by constantlyincreasing number of turns of the screw. When the abutments of a bridge are more than 55 mm.and less than 40 mm. apart, clamp D, upon Section A (Fig. 7),
Text Appearing After Image:
100 THE DENTAL REVIEW shall be the unit point and clamp I, upon Section B, shall be themovable point at which the mandrel for the required attachmentsshall be held. When the abutments of a bridge are more than 10 mm. andless than 25 mm. apart, clamp D, upon section A shall be the unitpoint, and clamp H upon section B, shall be the movable point forholding the required mandrels. When the abutments of a bridge are more than 7 mm. or lessthan 10 mm. apart clamp D upon section A shall be the unit pointand clamp G upon section B shall be the movable point for holdingthe required mandrels. When any two points more than 40 mm. and less than 55 mm.apart, are to be paralleled for attachments, clamp F, upon sectionA is to be used as the unit point, and clamp G, upon section A isto be used for the movable point for holding the required mandrels. X, Y, Z is a right triangle, of which Z is the hypothenuse andY Z the base. Base Y, Z, carrying mandrels, and being the movable sectionis bringing these

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