. Radiography and radio-therapeutics . Fig. 130.—Diagram to illustrate the method ofusing the cross-thread localiser. In actual practice it is advisable to get the shadow of the foreign bodynear to the centre of the cross wires. When the exact position of the foreign body has, by the triangulationmethod, been worked out, it is possible to state three measurements mrelation to the cross wires : (1) The depth, (2) the distance from the vertical hue, (3) the distancefrom the horizontal Hne, and the section of the plate defined by the shadow of the cross wires. , i, i • It is now possible to use t
. Radiography and radio-therapeutics . Fig. 130.—Diagram to illustrate the method ofusing the cross-thread localiser. In actual practice it is advisable to get the shadow of the foreign bodynear to the centre of the cross wires. When the exact position of the foreign body has, by the triangulationmethod, been worked out, it is possible to state three measurements mrelation to the cross wires : (1) The depth, (2) the distance from the vertical hue, (3) the distancefrom the horizontal Hne, and the section of the plate defined by the shadow of the cross wires. , i, i • It is now possible to use the marks which have been made on the skmsurface, and by exact measurements arrive at a spot beneath whichthe foreign body Hes. A matk shouldbe made on the skm at this point. A record of this may be made in theform of a drawing on a report sheet. Theglass side of the plate is used and thepaper corresponds to this surface, whichgives the position of the foreign body asthe surgeon looks at it when operating. A more convenient way is
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