. Elementary and dental radiography . illary and overlyingtissues. 7. Make of film: Eastern X-ray film. 8. Time of exposure : One (1) second. 9. Time in developer and developer used: Five (5) minutes. For-mula not given. Comment: Four and one-half killowatts expresses the rating ofthe machine. < haptcr 11. Had an [lford film been used instead of an Eastman, the time ofexposure would have been one-quarter second. It will be noticed that MAKING DENTAL RADIOGRAPHS 133 Dr. Peabody considers the Ilford film four times as fast as the Eastman,while my own experience leads me to believe that it is
. Elementary and dental radiography . illary and overlyingtissues. 7. Make of film: Eastern X-ray film. 8. Time of exposure : One (1) second. 9. Time in developer and developer used: Five (5) minutes. For-mula not given. Comment: Four and one-half killowatts expresses the rating ofthe machine. < haptcr 11. Had an [lford film been used instead of an Eastman, the time ofexposure would have been one-quarter second. It will be noticed that MAKING DENTAL RADIOGRAPHS 133 Dr. Peabody considers the Ilford film four times as fast as the Eastman,while my own experience leads me to believe that it is only about twiceas sensitive. When making exposures that necessitate the splitting of seconds,an automatic switch timer may be used to advantage. To make the negative of the radiograph shownffg. ii$ in Fig. 118 the conditions were as follows: 1. Machine used: A Ritchie, 10-inch inductioncoil, with i-point electrolytic interrupter, operating on a uo-volt D. 2. Strength of current: Fat, fuzzy spark 10 inches long Fig. 118. By Lodge, of Cleveland, O. 3. Make and condition of tube: Hartford, 7-inch tube. Length oftube-regulating spark gap, 3^ inches. The tube backs up four (4) inchesof parallel spark. 4. Distance of target from film: Ten (10) inches. 5. Thickness of part: That of superior maxillary and overlyingtissues. 6. Density of part: That of superior maxillary and overlying tis-sues. Patient 12 years old. 7. Film used: Eastman dental film. 8. Time of exposure. Six (6) seconds. 9. Time in the developer and developer used: Ten minutes in:Solution A, Water, 64 oz.; metol, 120 grs.; hydrochinon, 120 grs.; Seedssulphite of soda, 2 oz. Solution B, water, 16 oz.; Seeds carbonate ofsoda, 2 oz. For use take of A, 4 oz.; of B, 1 oz., and of water, 4 oz. To make the negative of the radiograph shownfig. 119. in Fig. 119 the conditions were as follows: 1. Machine used: Scheidel-Western, 12-inchinduction coil, with electrolytic interrupter, operating on a uo-volt D.
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