. Radiographie und Radiotherapeutik . tion des Röntgenstrahls kann auf verschiedene Weise hergestellt werden. Von diesen sind die üblichsten :(1) beeinflussen Maschinen, wie die bekannten Wimshurst oder Hultstmachines. (2) Induktionsspulen. (3) Aufwärtswandler. Einflussmaschinen die am häufigsten verwendete Art ist die Wimshurst; es ist weitgehend in Frankreich und in den Vereinigten Staaten eingesetzt, hat aber nicht viel Gunst in diesem Land gefunden, wahrscheinlich aufgrund klimatischer Gründe. Die Maschine funktioniert bestens in einem trockenen Klima, obwohl auch in einem feuchten ein Anordnungen können madeto die Schwierigkeit zu überwinden. Mit einem Multi-Plattenmasch
1977 x 1265 px | 33,5 x 21,4 cm | 13,2 x 8,4 inches | 150dpi
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. Radiography and radio-therapeutics . tion of the X-raybulb may be produced in a number of ways. Of these the most usual are :(1) Influence machines, such as the well-known Wimshurst or Hultstmachines. (2) Induction coils. (3) Step-up transformers. Influence Machines The type most commonly used is the Wimshurst; it is largely employedin France and in the United States, but has not found much favour inthis country, probably owing to climatic reasons. The machine works bestin a dry climate, though even in a humid one arrangements may be madeto overcome the difficulty. With a multiple-plate machine in good working order a steady X-raydischarge can be obtained. The current is unidirectional, and is not sodestructive to the anti-cathode as pulsating or alternating. The voltageobtained from a Wimshurst machine is proportional to the speed of theplates. The Induction Coil The essential parts of an induction coil are :(a) The Core.(6) The Primary. (c) The Secondary. (d) A condenser is necessary when a mercury interrupter is used.. 5.—Induction coil. (Cavendish Electrical Co. The Core.—In order to get the maximum of efficiency from the induc-tion coil the aim is to magnetise the core slowly (at make), and demagnetiseit rapidly (at break), the spark length depending upon the rapidity withwhich the core can be magnetised, the output of the coil upon the degreeof magnetisation. The size of the core depends upon the size of the primary and the THE INDUCTION COIL 17 current passing through it, and on the frequency and character of thebreak and the output arranged for. The modern heavy discharge coil has a very large and stout iron core, generally made up of sheets of metal, whose length is five or six times itsdiameter or even more. The chief objects in core design are, (a) to diminish the inverse current, and (b) to reduce the losses due to eddy currents. The inverse currentis lessened by packing as much iron as possible into the space allowed forthe core. Eddy currents are r
