. Dental and oral radiography : a text book for students and practitioners of dentistry . Fig. 31-C. 76 DENTAL AND ORAL RADIOGRAPHY makes up the floor of the tube shield (D), and isconstructed of sheet lead with an opening of theproper size to allow the desired rays to passthrough. The compression cylinder (CC) () is made of aluminum with a lead liningwhich absorbs any secondary rays which havesucceeded in passing through the diaphragm. Itshould be apparent to any one that with this ap-

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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectradiographydental