Walsh, David · London : Baillière, Tindall and Cox · leaf 109
ied in a turnip or a block of paraffin.* Dawson Turner and others have published a simple formula forlocalizing.t Two photographs are taken on one plate by shiftingthe focus tube. The distances are measured from tube to platea, between the two positions of the tube b, and between the twoshadows on… … Fig. 40. Dr. Hedleys combined localizer and vacuum-tube-holder is a modification of Mr. Mackenzie Davidsons apparatus. It serves a double purpose, and is designed with a view to portability and simplicity. It consists of an upright steel bar screwed into a collapsible tripod stand, and carrying a…
X-rays · Radiography
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