Note 22 — Front matter (continued 2)
Reading edition
That this number really does represent the order of this oscillation frequency in an aerial has been shown by C. Tissot, Comptes Rendus, 132, p. 763, March 25, 1901, by photographs taken of the oscillatory spark of a Hertzian wave telegraphic transmitter. (See Science Abstracts, Vol. IV., Abs. 1,518.) He found frequencies from 0·5 million to 1·6 million.