Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 179
oves are shown, so that the horizontal line along whichthe tube moves may be adjusted at any one of three distancesfrom the screen. A scale is fixed on top of each groove sothat the block may be displaced accurately through anydesired distance. At the back of the screen are two leaden cross-wires,… … Fig. 49.—Paynes Localiser. where the wires cross. This is facilitated by using a strip ofmetal about 3 ins. long by 1 or 2 ins. broad, bent into aright angle. This is held behind the screen, so that the anglerests on the point where the wires cross, whilst the edges restone along each wire. The…
X-rays
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