WHILE present electromagnetic shock tubes 1,2 will generate very strong shock waves frequently and in a simple manner, many designs suffer from pronounced attenuation of the shock wave together ...

Clemedson, C.-J., Acta Physiol. Scand., 18, Supp. 61 (1949). Clemedson, C.-J., and Pettersson, Hj., Amer. J. Physiol. (in the press).