Walsh, David · London : Baillière, Tindall and Cox · leaf 46
Fig. 17.—Focus Tube for Contimuous Current.* … Fig. 18.—Focus Tube for Alternating Current.* the fluorescent screen or by a sensitized photographic surface.Jacksons tube, known as the focus tube (Fig. 17), consists ofa hollow sphere of glass from 2 to 4 inches in diameter. In one * Both these drawings are from The Induction Coil in Practical…
X-rays · Radiography
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