Chapter 3 Part 18
We will not describe details of construction, since those vary somewhat, and are dealt with in a more or less lucid way to suit the resistance of different X-ray tubes than does a valve-tube.
By screwing the point home till it touches the plate the spark-gap may be abolished; by screwing back the point the resistance can be increased gradually, till the light in the tube indicates that the inverse current has ceased. Where tubes of different hardness are used in succession, this ready means of regulation is of great value, and its effect on the appearance of a tube is often very striking. in most catalogues of electro-medical instruments, as well as in works on theoretical electricity. The external appearance, doubtless familiar to all our readers, is recalled by Figs. 29, 87, and 45. Fig. 41 shews diagrammatically the arrangement of essential parts.
Considering the primary current as entering at (A +), it may be traced up the metal pillar (G), across platinum points at (H) to the hammer (J), down the spring (D), and thence to the primary winding of the coil (bb). By that it is led round the core (aa), then back to the other terminal (A-). The core (aa), consisting of a bundle of wires or thin sheets of soft iron, becomes rapidly magnetised by influence of the current circulating round it.
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Tom Thym on December 18th 2009 in x-ray
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