"Roentgen" induction coils and other X-ray apparatus (1904) (14757672635)

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:
Apparatus cannot bemade by depending entirely on catalogues or even on the advice of expertsalready in the field, we maintain a comprehensive working exhibit and invite allwho may be interested in the subject to examine our display. In this way aprospective buyer can test the apparatus himself and see just what it will do. We have listed no complete outfits in this catalogue, as we prefer tocorrespond with each customer for the purpose of ascertaining his particularneeds. After receiving such information we are careful to recommend the mostsuitable equipment and thus every inquiry receives intelligent attention. When writing for an estimate it will save time and correspondence to state(a) kind of current and voltage available, (b) size of coil desired, or (c) characterof work to be done—whether radiographic, fluoroscopic or therapeutic. JAMES G. BIDDLE, General Sales Agent. Philadelphia, November, 1904. James G. Biddle, 1114 Chestnut Street, Philadelphia. 3 Roentgen Induction Coil.
Text Appearing After Image:
Figure 1. Roentgen Coils with Primaries HavingVariable Inductance. THE past year has seen many and remarkable improvements inour Induction Coils. Among these improvements the mostnotable is the use of Variable Inductance in the primaries of thecoils. It is a matter of recent discovery that if the inductance in theprimary of an induction coil be increased the spark voltage of thesecondary coil is decreased and the wave form of the secondarycurrent is changed. This is the principle used in our primaries having VariableInductance. In Germany it is known as the 4< Walter method ofcoil construction, or Walters Schaltung, while in this country ithas been developed by the Roentgen Manufacturing- Company. James G. Biddle, 1114 Chestnut Street, Philadelphia. The quality of the secondary discharge isijua 1 y o varied as the value of the inductance of the primary is changed. As the inductancevalue is increased the spark voltage is decreased and the currentwave is lengthened out. This reductio