. The American journal of roentgenology, radium therapy and nuclear medicine . entitled X-Ray Chest Manual, re-printed from the transactions of the 14thAnnual Meeting of the National Tubercu-losis Association: The tube must movethrough a plane parallel to the plate. Theessential pith of my argument is that thetube should not be tilted but should be movedin its entirety in a plane parallel to the plate. Taking into consideration the physics andpractical construction of modern .I-ray tubes,there would be no fundamental difference inmaking stereoscopic negatives whether thetube zvas shifted in a
. The American journal of roentgenology, radium therapy and nuclear medicine . entitled X-Ray Chest Manual, re-printed from the transactions of the 14thAnnual Meeting of the National Tubercu-losis Association: The tube must movethrough a plane parallel to the plate. Theessential pith of my argument is that thetube should not be tilted but should be movedin its entirety in a plane parallel to the plate. Taking into consideration the physics andpractical construction of modern .I-ray tubes,there would be no fundamental difference inmaking stereoscopic negatives whether thetube zvas shifted in a plane or rotated in thearc of a circle; the only condition which itwould be necessary to fulfil being that the circle of rays covered on the plate satisfac-torily covered the subject. There, of course, might be a theoreticalcase where a long narrow cylinder was usedwhere this would necessarily have to betilted in order to cover the object, but in theaverage practice it would certainly not be thecase. Even in the case of the use of theBucky-Potter diaphragm the writer doubts.
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