. Radiography and radio-therapeutics . ction of the cross threads marking the foreign body (b) to be 1-9 cm. above the celluloid, 3 cm. behind the plane of the vertical cross line (B), and 1 cm. below the plane of the horizontal cross hne (A), and the intersection of the thread marking the upper end of the lead wire (a) to be 2-9 •cm. above the celluloid, 1-2 cm. behind the plane of the vertical line (B), and -6 cm. below the plane of the horizontal line (A), then by subtraction the foreign body is 1 cm. to the temporal side, 1-8 cm. behind and 4 cm. below the upper end of the lead wire, and a
. Radiography and radio-therapeutics . ction of the cross threads marking the foreign body (b) to be 1-9 cm. above the celluloid, 3 cm. behind the plane of the vertical cross line (B), and 1 cm. below the plane of the horizontal cross hne (A), and the intersection of the thread marking the upper end of the lead wire (a) to be 2-9 •cm. above the celluloid, 1-2 cm. behind the plane of the vertical line (B), and -6 cm. below the plane of the horizontal line (A), then by subtraction the foreign body is 1 cm. to the temporal side, 1-8 cm. behind and 4 cm. below the upper end of the lead wire, and as the latter is -5 cm. below the centre of the ■cornea, we are able to say that the foreign body lies 1-8 cm. behind, 1 cm. to the temporal side, and -9 cm. below the centre of the cornea, with the eye looking at a distant object. Lastly, it should be remembered that the skiagrams taken in this wayare stereoscopic, and if so viewed will give a stereoscopic effect; andas the lead wire is of the known length of 1 cm., it may be used. Fig. 148,—Sweet localiser. stereoscopically as to scale to estimate approximately the size and positionof the foreign body. (b) Sweets Method of Localisation.—Dr. Sweets method of localis-ing foreign bodies in the eye and orbit is carried out by means of the specialapparatus designed by him for the purpose. Fig. 148 shows the device, 12
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