Identifier: americanjournroen07ameruoft (find matches)
Title: The American journal of roentgenology, radium therapy and nuclear medicine
Year: 1906 (1900s)
Authors: American Radium Society American Roentgen Ray Society
Subjects: Radiotherapy X-rays
Publisher: Springfield, Ill. C.C. Thomas
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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r the interrupted ex-posure using the regular discs, when itwould be necessary to allow more than fiveseconds to give an exposure of one and one-fourth seconds. The device consists of a solid brass wheelof the same diameter as the wheels fur-nished with the timer. The periphery of thiswheel is marked in ten equal segments, eachbeing further divided into quarters, and onesubdivided into sixteenths. One notch onlyis provided for breaking the circuit and thisnotch is insulated on all sides. To use this device, the double-pole doublethrow switch (shown on the lawer part ofthe wall in Fig. i) used for changing fromthe timer to the foot switch for fluoroscopy,is opened. The disc is then placed so thatthe end of the spring on the timer lever armis opposite the number of seconds or frac-tions of seconds desired. The clock-workmechanism is then started. Closure of thedouble pole switch will now start the discrevolving and closing the .r-ray circuit untilthe disc has revolved to the open notch,
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Fig. I. Shows theNew Disc in placeON THE Timer, re-placing THE \ARI- OUSLY NOTCHED DISCSSHOWN ON THE CURVED RACK ABOVETHE TIMER. AlSO THEDOUBLE THROW SWITCH (lower part)which closes thecircuit through theTimer. Fig. 2. View (actualsize) OF Disc At-tachment. when it will automatically stop and the.r-rav circuit be broken. The device has been found sufficiently ac-curate for all exposures down to one-fourthsecond. Shorter exposures are inaccurate onaccount of the variation in time of startingthe disc to revolve by closing the timercircuit. REPORT OF A CASE OF OSTEO-SARCOMA OF THE TIBIA By CHARLES EASTMOND, M.D. BROOKLYN, NEW YORK The patient is a girl of sixteen who re-ceived a blow on the inner side of the legjust below the knee, in the latter part ofJanuary, 1920. The blow was produced bythe spilling of a toboggan contammg: two other girls, and in the accident the side of thetoboggan struck the leg. Nothing but a slight degree of tenderness,pain and disability were experienced; butthr

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