Morton, Edward Reginald, 1867- · New York : E.B. Treat & Co. · leaf 160
plate. We have also two shadows on the plate thrownby the foreign body with the tube in its two positions. The plate is now placed centrally on the Mackenzie-Davidson localiser, which consists of a plate glass table LOCALISATION. 133 with two uprights and a graduated crossbar slidingthereon. The… … Fig. 50. Mackenzie-Davidsons Localiser. •centimetres from the middle line and led to the centre ofthe shadow of the foreign body of the opposite side sothat the two threads cross at a certain point. The threadsrepresent the central ray when the images were photo-graphed, and, of course, will cross…
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