File:The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14570725809).jpg

Identifier: americanjournroen09ameruoft (find matches)
Title: The American journal of roentgenology, radium therapy and nuclear medicine
Year: 1906 (1900s)
Authors: American Radium Society American Roentgen Ray Society
Subjects: Radiotherapy X-rays
Publisher: Springfield, Ill. C.C. Thomas
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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ed scalene triangles uponthis line as a common base so that theirapices are 24 in. from the point atwhich the perpendicular bisects the base, -4^ The Van Zwaluwenburg Type of Stereoscope 43 and is in. from the perpendicularline, or, in other words, the apices should be2K in. from each other (the approxi-mate average of the distance between thepupils of the eyes). Now cut two suchtriangles from paper and superimpose themover the triangles of the drawing, fixingthe apices securely. To obtain the anglesfor the mirrors and light boxes, foldthe paper triangles back along such a line It has been found desirable to have thelight boxes placed upon a table of such aheight as to permit the study of plateswhile seated. This simplifies the con-struction of the mirror support and itsadjustments, as it is necessary to have asingle tubular support to allow for rotation,as well as for elevation of the mirrors.This can be done by having a supportw-orkin a friction holder placed either on or <l$ W/A
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*-->£-*? Fig. 3. Diagram of each step in construction and plan of completed stereoscope. as to bring the base of the folded triangleparallel to the shorter side of the oppositetriangle of the drawing. The bases nowform the position and angle of the illu-minated side of the light boxes, and thelines of the folded portions of the papertriangles when projected to cross the per-pendicular erected at the point ot bisec-tion of the base, form the angle at which theviewing mirrors should be set. Light boxes may be constructed and soarranged that their ground glass illu-minated surfaces coincide with the line olthe bases of the triangles. Two plateglass mirrors, preferably 5 by 16 in., arefastened on a holder so that they form theangle laid out above for them. under the table at a point equidistantfrom the bases of the light boxes. An advantage in the construction of thelight boxes is placing the curtains insidethe box and employing a rheostat controlfor the illumination. Two persons may

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