. Radiography, x-ray therapeutics and radium therapy . Fig. -Diagrani to illustrate simple formula forlocalising. (After Walsh.). distance of the foreign body from the X axeh+c Supposing a to be 33 cm., 6 10 cm., and c 1 cm., then33x1 x = = 3 cm. 10 + 1Mackenzie Davidson has suggested a short methodof locaUsation which, while based on his originalmethod, allows of more rapid locaUsation. Thecentral ray is determined and the position fixedby means of a plumb line. The foreign body islocated directly under the point of the plumb mark is made upon the skin, a plate is expose
. Radiography, x-ray therapeutics and radium therapy . Fig. -Diagrani to illustrate simple formula forlocalising. (After Walsh.). distance of the foreign body from the X axeh+c Supposing a to be 33 cm., 6 10 cm., and c 1 cm., then33x1 x = = 3 cm. 10 + 1Mackenzie Davidson has suggested a short methodof locaUsation which, while based on his originalmethod, allows of more rapid locaUsation. Thecentral ray is determined and the position fixedby means of a plumb line. The foreign body islocated directly under the point of the plumb mark is made upon the skin, a plate is exposed,the tube is moved a known distance, and a secondexposure made. The depth of the body is deter-mined by calculation in the ordinary way. Twocross wires, arranged at right angles, must be Hampson has simplified this method still furtherby having a graduated scale fixed to the fluorescentscreen. By movement at the time of screening he isable to say the depth of the foreign body at a pointvertically below the skin mark. This method canonly be used at a fixed distance in all cases unlessseparate scales are worked out for e
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