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The magnetometer consists mainly of two parts: a Helmholtz‐Gaugain coil fixed on a horizontal divided circle for producing a uniform vertical magnetic field to balance the vertical component of the earth's field, and a magnet‐balance system for observing the effect of the fields. The vertical...
A beta‐ray spectrometer has been constructed utilizing the chromatic aberration of a ``thin'' magnetic lens. The lens is wound of 300 pounds of copper wire and does not utilize iron. Its focal length for transmitted electrons can be varied from 25 to 50 cm and the magnification from 0.5 to 2....
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