Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 156
r development a double image of the foreign bodyis shown, but only one image of the lead cross-wires. Toutilise the negative so obtained, a cross-thread localiser is used,which Mr. Davidson describes thus :— A sheet of plate glass is fixed horizontally, having twolines marked upon its surface… … Pig. 44.- E C F D -Graphic Method of Localisation. hidden object, the size and position of which we wish to know. If we take aradiogram with a tube, T, we shall obtain a shadow, CD, on a plate, PQ, placedbelow the object; if we move the tube to another position, S, we shall obtainanother shadow,…
X-rays
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