. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . xample. The ordinarydiluted lunar caustic consists of equal parts of nitrate of silver andnitrate of potassium. This substance is too strong, and I have hada crayon made which has a smaller proportion of nitrate of silver, inorder to obtain a pencil suitable for marking on the skin. The crayonshould be moistened when it is to be used. The above method of locating a foreign body applies to all suchas can be seen on the fluorescent screen, but some
. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . xample. The ordinarydiluted lunar caustic consists of equal parts of nitrate of silver andnitrate of potassium. This substance is too strong, and I have hada crayon made which has a smaller proportion of nitrate of silver, inorder to obtain a pencil suitable for marking on the skin. The crayonshould be moistened when it is to be used. The above method of locating a foreign body applies to all suchas can be seen on the fluorescent screen, but some cannot be thusrecognized, and in this case the radiograph must be employed. FOREIGN BODIES 53: Second Method ; by X-Ray Photograph. Stereoscopic Pictures. — Dr. G. P. Girdwood ^ has devised an excellent method of locating a foreignbody by means of stereoscopic radiographs. Dr. Mackenzie Davidson ^has also worked out a similar method which differs in certain particularsfrom that of Dr. Girdwood. Localizers. — A number of forms of apparatus have been made forthe purpose of localization, among which the following deserve specialmention : —. Fig. 303. Mackenzie Davidsonexposer. The photographic plate is placed beneath the crossedwires on the board. The wires are inked and leave marks on the skin of the part, and the imageof the wires appears on the negative. This gives lines for localization. The tube is suspended verti-cally above the transverse wire and equidistant at each exposure from a point vertically above wherethe wires cross. Fig. 303 and Fig. 304, and descriptions, are taken from The Use of the Roentgen Ray in theWar with Spain, by Captain W. C. Borden. Mackenzie Davidson has devised a very ingenious apparatus forlocating a foreign body. The following account is quoted from an arti-cle ^ by him and Dr. Hedley : — Two wires at right angles to each other are placed upon the photo-graphic plate, film, or paper. The Crookes tube is then placed withits anode at a measu
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