Walsh, David · London : Baillière, Tindall and Cox · leaf 70
ntly in the air. Behind to right andleft will be two images, but these he soon learns to ignore, or he can cut them offby bringing his hands cautiously from the outer side of each eye towards themiddle line, stopping the moment the two side images are cut off. It is, ofcourse, very convenient in… … ELECTRICAL APPARATUS AND METHODS 61 VII. STANDS AND OTHER ACCESSORIES
X-rays · Radiography
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