He noticed a drying of the skin, which he ignored. 5 After 4 days, he was compelled to stop work. On 12 August 1896, Electrical Review reported that Dr HD Hawks, a graduate of the 1896 class of Columbia College, gave a demonstration with a powerful X-ray unit in the vicinity of New York. After 21 days all the hair fell out from the space under discharge, which was approximately 2 inches in diameter. The tube was placed 0.5 inches away from Dudley's hair and activated for 1 h. A plate holder containing the sensitive plate was tied to one side of Dudley's head and the tube attached to the opposite side of the head. Dr Dudley, with his characteristic devotion to science, lent himself to this experiment. Before attempting to locate the bullet in the child, Professor Daniel and Dr Dudley decided to undertake an experiment. In February 1896 a child who had been accidentally shot in the head was brought to the laboratory at Vanderbilt University (Tennessee, USA). Fritz Giesel later died in 1927 of metastatic carcinoma caused by heavy radiation exposure to his hands. For many years the laboratory provided practitioners with images of the jaw and head. In 1896, Otto Walkhoff and Fritz Giesel established the first dental roentgenological laboratory in the world. He noticed a loss of hair on the side of the head of some of the patients he irradiated, 2 but as there was no mention of blisters on the skin it is assumed that the absorbed dose was less than 300 rads. Later, in 1896, Walkhoff succeeded in making extra-oral pictures with an exposure time of 30 min. 1 However, the exact nature of this torture has not been described. Walkhoff said that those 25 min of exposure were a torture to him. He took an ordinary photographic glass plate, wrapped it in a rubber dam, held it in his mouth between his teeth and tongue and then lay on the floor for a 25 min exposure. It was barely 14 days after the announcement of the discovery of Roentgen rays that Friedrich Otto Walkhoff took the first dental radiograph.
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