"Roentgen" induction coils and other X-ray apparatus (1904)
James G. Biddle Company · Philadelphia : James G. Biddle · leaf 32
ltage to jump across the resistance of an inch of air or more. If the series spark gap is greater than the distance through which the inverse discharge will jump, it cannot pass into the tube and blacken it. This form of series spark gap is the evolution of the work ofseveral years in the attempt… … Figure 15. Roentgen Ammeter for X-Ray Tubes. THE Roentgen Ammeter is .an instrument which measures di-rectly in milliamperes the current obtained from the second-ary of an induction coil. Its value lies in its indication of the cur-rent which produces X-Rays, thus giving a means of measurementof…
X-rays · Induction coils · Radiography
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