Key points are not available for this paper at this time.
An ionization chamber is described which is nearly air-equivalent from 0.5 to 2.5A, ``effective wave-length.'' It has been made adaptable for use with the electrometer and charging system of the Victoreen Minometer. Its sensitivity is of the order of 0.15 roentgen per scale division. Suggestions are made for possible improvements.
Herman E. Seemann (1949) studied this question.