. Radiography and radio-therapeutics . C rt. ^ S RADIOGRAPHY OF THE FRONTAL AIR SINUSES 205 bedding it in a circular hole of the proper size cut in a piece of cardboard ofabout the same thickness as that of the lead, and trimming the cardboardto the necessary size and shape. To keep the disc firmly in its place withinthe cardboard, two circular discs of thinner cardboard are cut with diametersequal to AB, and cemented with glue or seccotine one on each side of thecompound disc of lead and cardboard. The result is a disc which looks asif it were made entirely of cardboard, but which really cont
. Radiography and radio-therapeutics . C rt. ^ S RADIOGRAPHY OF THE FRONTAL AIR SINUSES 205 bedding it in a circular hole of the proper size cut in a piece of cardboard ofabout the same thickness as that of the lead, and trimming the cardboardto the necessary size and shape. To keep the disc firmly in its place withinthe cardboard, two circular discs of thinner cardboard are cut with diametersequal to AB, and cemented with glue or seccotine one on each side of thecompound disc of lead and cardboard. The result is a disc which looks asif it were made entirely of cardboard, but which really contains the leaddisc embedded in a central position in it. Wood or other partially trans-parent materials can of course be used instead of the cardboard. A coatingof new skin renders the disc waterproof, and it can then be washed aftereach case. When radiographing particular areas of the skull, the diaphragm shouldbe shut down to the smallest possible size, or if the tube is used overhead asmall extension tube should be inserted between the tu
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