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Wortleys

rays and plate

WORTLEY'S PROCESS.—A dry collodion process invented by Colonel Wortley, in which the following is used as a preservative : X RAYS.—One of the most remarkable discoveries of the present century was that made by Prof. Roentgen. He discovered that certain rays (which for want of a name he calls X Rays) emanating from a Crookes vacuum tube have the same effect upon a photographic dry plate as light. Moreover, these rays will penetrate all kinds of substances, such as a block of wood twelve or more inches thick, with the greatest ease. Other substances, such as metal, bone, etc., were less transparent. The value of this discovery to the surgeon is a very great one, as can easily be imagined. Fig. 495 shows an X ray photograph or Radiograph, as it is called, of a foot encased in a shoe.

The method of making these Radiographs is shown in Fig. 494• The photographic dry plate is inserted in an ordinary plate-holder and the objects to be radiographed laid on the out side. In the sketch shown on the holder was laid a pocketbook of dark Russia leather, with

several flaps of leather within, and containing seven cards, two of them thick. A number of coins were slipped into the inside compartment of the book, which was then closed and laid upon the board under the tube. .

On the plate, when developed, only a faint shading was left by the pocketbook, see Fig. 496, but the coins left a strong and definite picture, showing with surprising clearness their num ber and position in the book. A trace of Prof. Wright's hand, which rested upon the board during this experiment, was also strongly depicted. The outlines of the hand are somewhat blurred, and in the palm faint traces of the passage of the rays between the bones could be detected.