"Roentgen" induction coils and other X-ray apparatus (1903)
James G. Biddle Company · Philadelphia : James G. Biddle · leaf 31
. .» TM 45.oo Ventril or Valve Tube. These tubes are used in series with the X-Ray tube and the in-duction coil to prevent the inverse discharge from passing throughthe X-Ray tube. They take the place of the series spark gap andhave over it the advantage of absence of noise and constant resistance…
X-rays · Induction coils · Radiography
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