Air Blade. Dr. E. F. Fullam of General Electric Co. told about a slicing machine that apparently does its work without even touching the material that it slices. The machine has a small circular blade that is spun by an electric motor at 65,000 r.p.m. Its rim, moving faster than sound, forms a cutting edge of compressed air much sharper than a razor. Hard metals can be sliced into films two-millionths of an inch thick. Since the blade does not get dull, Dr. Fullam believes that it never touches the work.
Supermanometer. The Fischer & Porter Co. of Hatboro, Pa. has...
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