"Roentgen" induction coils and other X-ray apparatus (1904) (14734682866)

Identifier: roentgeninductio1904jame (find matches)
Title: "Roentgen" induction coils and other X-ray apparatus
Year: 1904 (1900s)
Authors: James G. Biddle Company
Subjects: X-rays Induction coils Radiography
Publisher: Philadelphia : James G. Biddle
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School



Text Appearing Before Image:
induction coil and the X-Raytube, to prevent the inverse discharge from going through the tube.When the inverse discharge is permitted to pass through the tube,a blackening of the inner walls of the tube occurs and is attributedto the deposition of the metal of the electrodes upon the glass. The most practical form of resistance hasHow it is Used been found to be a spark gap placed in series with the terminal of the induction coil and the tube, as the inverse discharge often is of sufficient voltage to jump across the resistance of an inch of air or more. If the series spark gap is greater than the distance through which the inverse discharge will jump, it cannot pass into the tube and blacken it. This form of series spark gap is the evolution of the work ofseveral years in the attempt to obtain something simple andefficient. We furnish a set of these series spark gaps with each one ofour X-Ray coils. James G. Biddle, 1114 Chestnu Street, Philadelphia. 27 Roentgen Ammeter. (Patented).
Text Appearing After Image:
Figure 15. Roentgen Ammeter for X-Ray Tubes. THE Roentgen Ammeter is .an instrument which measures di-rectly in milliamperes the current obtained from the second-ary of an induction coil. Its value lies in its indication of the cur-rent which produces X-Rays, thus giving a means of measurementof the quantity of X-Rays, for, as we have found, the quantity ofX-Rays is directly proportional to the current producing them. Till now it has been impossible to deter-mine the most important part of the tech-nique of X-Ray treatment—namely theQuantity of X-Rays. We have been able readily to measure thelength of time of treatment, the distance of the source of the rays 28 James Q. Biddle, 1114 Chestnut Street, Philadelphia. from the patient, and approximately the kind of rays; but we havebeen able only to guess at the quantity of the rays by the appear-ance of the tube and by the way the coil is running. Now it is possible for X-Ray workers to establish a completeand strictly scientific method