File:Elementary and dental radiography - by Howard Riley Raper (1918) (14757888712).jpg

Identifier: elementarydenrape (find matches)
Title: Elementary and dental radiography / by Howard Riley Raper
Year: 1918 (1910s)
Authors: Raper, Howard Riley
Subjects: Radiography Dentistry Radiography, Dental
Publisher: New York : Consolidated Dental Mfg.
Contributing Library: West Virginia University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
ok through the plate just at the edge. Whenthe glass side is up. one is able to look through the glass and see the filmbeneath. The sensitive side of the plate should present toward thesmooth side of the envelope—away from the seam side. The plate should be handled by the edges. (Fig. 69.) This appliesto the handling of the plate at all times, and to the handling of the filmas well. Unless the fingers are wet or greasy, touching the sensitive side *Experienced photographers prefer to handle sensitive plates in absolute dark-ness, and soon learn to detect the film side of the plate by feeling lightly with thefingers, thus obviating the need of the dark room light when loading plates.—Ed, 70 ELEMENTARY RADIOGRAPHY of the plate is not likely to result in spotting the picture, but it is alwayswell to eliminate as many chances of failure as possible. We are now ready to arrange tube, hand, and plate in their properrelative positions to take the picture. In all radiographic work it must
Text Appearing After Image:
STA/VD Fig. 70. Showing relative positions of tube, hand, and plate for making a radiograph of the hand. constantly be borne in mind that we are making a shadow picture; thatwe are simply throwing a shadow on the plate, using X-rays as thesource of light. Lay the plate on a stand, sensitive side up. Place the hand on theplate. Adjust the tube at a variable distance directly above the hand.(Fig. 70.) MAKING RADIOGRAPHS 7* The distance from the tube to the plate may vary from about 10 to20 inches, measurements being taken from the target, not from the glassof the tube. It is not necessary to have the target and the plate parallelto one another (in the same plane) as some writers direct. On the con-trary, the position as in Fig. 70 is a better arrangement. Assuming now that the tube is properly hitched to the coil and work-ing properly, we are ready to make the exposure—to take the picture. In giving demonstrations, I find that at this point someone invariablyvolunteers to turn out the

Note About Images