The Effect of the Magnetic Field on the Magnetic Field on the Absorption of XRays A Thesis Presented to the Faculty of the Graduate School of of Doctor of Philosophy Classic Reprint

Excerpt from The Effect of the Magnetic Field on the Magnetic Field on the Absorption of X-Rays: A Thesis Presented to the Faculty of the Graduate School of Cornell University for the Degree of Doctor of Philosophy

Since the effect is small it is necessary to be able to keep the two ionization currents balanced to within 1 or 2 parts in Con sequently every effort was made to reduce the errors to a minimum. The larger part of the time was taken up in determining and eliminating spurious changes in 6. The following list gives the chief factors to be guarded against.

Sources OF error. (a) Electrostatic effects. (6) Unsteadiness of leaf of electroscope. (c) High-resistance leaks. (d) Stray x-radiation. (e) Slight Changes in the position of the focal Spot. (f) Changes of current through the tube. (g) Peculiarities of the ionization chambers. (h) Effect of the magnetic field on the tube or ionization chambers. (1) Movement of the specimen caused by H or by the slight Shifting of the pole-pieces.

To show how these errors were eliminated it is necessary to give a detailed description of the apparatus.

The electroscope. Fig. I shows a detail drawing of the electroscope. It can be con structed by an amateur mechanic in a Short time. The brass box Was made detachable, but the joints were sealed with wax to make them137 joseph A. Becker.

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