"Roentgen" induction coils and other X-ray apparatus (1904)
James G. Biddle Company · Philadelphia : James G. Biddle · leaf 45
Figure 29. B3226. (Type V). Diameter of Bulb, 514 $20.00 B3227. (TypeE). sj£ 27.50 B3228. (Type I). sW B3227 and B3228 are provided with regulating devices to lower vacuum. 30.00 Ventril or Valve T\ibe. … Figure 30. B3229. Ventril Tube, $ 7.50 WHEN placed in series with an X-Ray tube the ventril tubehelps to cut out universe discharge. For this purposeit is most valuable, and is used by many expert operators. James G. Biddle, 1114 Chestnut Street, Philadelphia. 41 Tube Rack.
X-rays · Induction coils · Radiography
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-518-322.webp)
