. The American journal of roentgenology, radium therapy and nuclear medicine . necessary to usediaphragm. The technician is sometimes carelessbout having the central ray strike theate perpendicularly. With the longibes, especially those of small diameter,lis mistake is not likely to be made,s the operator does not have muchladow-space to waste, he is, as a matter: necessity, more careful about centeringle tube. Thus, distortion of shadowsre prevented and a more constant tech-ique is insured. For subjects of average size the target-late distances are automatically fixed,^hich serves to facilita
. The American journal of roentgenology, radium therapy and nuclear medicine . necessary to usediaphragm. The technician is sometimes carelessbout having the central ray strike theate perpendicularly. With the longibes, especially those of small diameter,lis mistake is not likely to be made,s the operator does not have muchladow-space to waste, he is, as a matter: necessity, more careful about centeringle tube. Thus, distortion of shadowsre prevented and a more constant tech-ique is insured. For subjects of average size the target-late distances are automatically fixed,^hich serves to facilitate the examination,.s the target-plate distance is increased,tie time of exposure is greater, but this; well compensated for by the greaterwealth of detail and the comparative ab-3nce of distortion it ensures. For nearly11 bone work we use an exposure of teneconds with the tube passing 20 ma.,arying only the spark gap by changinghe rheostat or the heat of the filament ofhe Coolidge tube. In conclusion we claim that the longcompression tube offers the following ad-vantages :. Fig. 2. Less distortion of shadows; Richer details and better definition; Greater safety for the patient; Easier to center; Simple immobilization. Stability of target-plate distances. PROFESSIONAL ETHICS IN CUBA The Reiista de Mediciiia y Cinigia ofHavana relates that the Medical PressAssociation of Cuba has decided to under-ake a tenacious campaign against quack-ery, quack advertising and quack prac-tices, and against acts committed by phy-sicians that do not conform to professional?thics. It says: Notwithstanding the reso-utions voted in recent national represen-:ative gatherings, the evils in the medical-orps are increasing instead of diminishing,[t is actually scandalous that, in the very-apital of the nation, individuals withuniversity degrees are serving as protectorsFor animal-magnetism healers, and that in^ome laboratory and other institutes—perhaps behind the back of their medicaldirectors—effo
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