Roentgen Induction Coils and Other X-Ray Apparatus (Classic Reprint)
Most of the Roentgen Induction Coils are supplied with six different adjustments in the value of the inductance.
Mistake must not be made by confusing the quality of the spark of a coil of originally short spark length with that of a large coil whose spark length is reduced by means of inductance.
Makers of induction coils heretofore have been using as little wire in the windings of the primary and secondary coils as was consistent with the production of the spark length: and no atten tion whatever has been paid to the relative proportions of these windings.
We have given this matter our especial attention since the principle was discovered in our laboratory and the exact relation of the resistances, capacities and inductances of the primary and secondary coils is carefully determined.
The quality of the spark is obtained only by using a coil of long rated spark length and using a variable inductance of high value in the primary coil.
We recommend the coils of long spark length - 18, 20 or more inches. All our coils of 15-inch spark or more are supplied with six steps of adjustment. Those of 12-inch, with four steps. And those below 12 inches are not supplied with variable inductance in the primary, as it is impracticable to obtain the desired effect from the shorter spark lengths.
A soft tube should not have the strain imposed upon it of the very long spark, as the inverse discharge is apt to be sufficiently high to pass through it and reduce its vacuum.
If on the contrary the tube is called upon to carry current at an impressed voltage about equal to-its own spark resistance there is less likelihood of the passage of the inverse discharge.
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