. American quarterly of roentgenology . tible, and all coins appearto lie directly on the screen. In viewing the lower set of coins by means of the stere-oscope, all four coins appear of equal size; the difference inthe intensity of the shadows is not nearly so marked, and theirrelative distance from the screen quite distinct. (See lowerset of coins marked Stereoscopic) This holds good only when the plates are viewed in the sameway in which they were taken, i. e., the coins to appear be-tween the wire screen and the observer. By transposing theplates, that is, by shifting the right plate to th
. American quarterly of roentgenology . tible, and all coins appearto lie directly on the screen. In viewing the lower set of coins by means of the stere-oscope, all four coins appear of equal size; the difference inthe intensity of the shadows is not nearly so marked, and theirrelative distance from the screen quite distinct. (See lowerset of coins marked Stereoscopic) This holds good only when the plates are viewed in the sameway in which they were taken, i. e., the coins to appear be-tween the wire screen and the observer. By transposing theplates, that is, by shifting the right plate to the left and theleft plate to the right, without turning them, the difference inthe size will appear even more exaggerated. (See upper set ofcoins marked Psendoscopic on card 2.) Another disadvantage of the single X-ray plate is the factthat the translucent lung is obscured by the shadow of the o m ! S o z 0) H33> n (0 HPiDO m O ix — > — > >»3 O ng u r o OD a>•o. X OO PIX 0 m 1m 2H I5 I Do •i. -;;;;;; • • ffi{ffi,ltt,n ♦ ♦,.»...» • » . .• » »
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