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The construction of a magnetic electron microscope for the observation of self‐emitted and secondary electrons from the same surface is described. Primary and secondary images obtained are illustrated.
By the use of two type 37 vacuum tubes it has been found possible to design a high impedance voltmeter which possesses an approximate voltage squared characteristic, and is therefore suitable for the measurement of r.m.s. values of alternating potentials. The circuit of the voltmeter is such as...
A large cyclotron is described with particular reference to magnet design, ``ion‐source'' characteristics, radiofrequency requirements, optimum shape of the magnetic field, and the distribution in range of the high energy alpha‐particle beam. Increasing the ``ion‐source'' electron current...
The automatic recording and computing comparator previously described has been adapted to the production of uniform and nonuniform scales. A photographic plate is clamped to the covered comparator carriage, where it is exposed to diminished images of a slit illuminated by an argon lamp which is...
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