Abstract
DURING the past year there has been available to dermatologists a new type of x-ray machine which should be more flexible and more widely applicable than any single piece of x-ray apparatus thus far used in dermatology. The machine is shock proof and self rectified and emits in great intensities extremely soft radiations, even softer than grenz rays. The emission of great intensities of soft radiation is due to a special x-ray tube with a beryllium window. Beryllium is a light metal with an atomic number of 4, a high melting point, of 1,285 C., and a specific gravity of 1.85. It has the appearance and hardness of steel even though it is slightly heavier than magnesium and lighter than aluminum. Beryllium is obtained from beryl ore, and there are only limited quantities of it. At present the metal is used in cast form. The beryllium window can be
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