. Elementary and dental radiography / by Howard Riley Raper . Fig. 391. Pose for extra-oral radiograph• Fig. 390. made on film, and the radiograph. Beginners will probably find the indicator a help. Men experienced in the practice of radiodontia will not be likely to use it except as a means of making a series of exposures of the same part when they particularly desire to make each exposure with the rays passing through the parts and striking the film at the same angle every time. As a means of duplicating a pose exactly, an indicator of some sort is a necessity. The soft tube technic for dent
. Elementary and dental radiography / by Howard Riley Raper . Fig. 391. Pose for extra-oral radiograph• Fig. 390. made on film, and the radiograph. Beginners will probably find the indicator a help. Men experienced in the practice of radiodontia will not be likely to use it except as a means of making a series of exposures of the same part when they particularly desire to make each exposure with the rays passing through the parts and striking the film at the same angle every time. As a means of duplicating a pose exactly, an indicator of some sort is a necessity. The soft tube technic for dental radiographic 4»?5Jl-5 work is becoming definitelv more popular. The Clonic. 11 , , • ,,., parallel spark gap is set for only about 4 inches and the tube so reduced in vacuum, if necessary, that even this short gap is not backed up. Splendid black and white negatives are made by this technic. It is important to know that the time of exposure necessary, and so the milliampere-second dose, is greater when the soft tube technic is employed. Both Drs. Ot
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