. The American journal of roentgenology, radium therapy and nuclear medicine . M/flaOR5 VIEW BOX Fig. 40 Use of the Wheatstone Stereoscope tube; that is to say, between the two expo-sures which must be made, we must havea straight Hne distance of two and one-halfinches. It makes no difference whether wemove the x-ray tube in an arc of a circle,in a straight line, or in any other curvewhich we may desire to use to accom-modate the mechanism of our x-ray tubeholder, so long as the final result is a hori-zontal distance of two and one-half inches. beliveen the two positions of the focus spot
. The American journal of roentgenology, radium therapy and nuclear medicine . M/flaOR5 VIEW BOX Fig. 40 Use of the Wheatstone Stereoscope tube; that is to say, between the two expo-sures which must be made, we must havea straight Hne distance of two and one-halfinches. It makes no difference whether wemove the x-ray tube in an arc of a circle,in a straight line, or in any other curvewhich we may desire to use to accom-modate the mechanism of our x-ray tubeholder, so long as the final result is a hori-zontal distance of two and one-half inches. beliveen the two positions of the focus spotsat the times of the tavo exposures. The perpendicular points let fall uponthe plate from the focus spots are called thefoot points, being the feet of the per-pendicular lines drawn from the focusspots to the plate. These foot pointsare the important things with respect tothe identity of the plates of the stereo-scopic pair. In order to obtain the maxi-mum benefit of the field of vision it isstill obvious that the focus spots shouldbe symmetrically placed about the centerof the plate with a distance of one andone-fourth inches from each of the focusspots to the perpendicular let fall upon thecenter of the plate. Since we must have two plates in thestereoscopic pair—one for the right eye Fig. 2. A ^\. A >/>.
Size: 2349px × 1064px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidamericanjour, bookyear1906
