Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 115
B =£ A t= OnrOO—Oin. Fig. 31.— Holtz Machine. c and d, are cut close to these holes, and on the side of theplate remote from the revolving disc are fixed two paperarmatures, e and /. These strips of paper have projectingtongues which point through the holes or windows and reachvery nearly to the…
X-rays
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