Possible discontinuance of radio standard frequency transmissions
Journal of the A.I.E.E. · 1926
Since March, 1923, the Bureau of Standards has been transmitting, twice a month, radio signals of definitely announced frequencies for use by the public in standardizing frequency meters (wave meters) and transmitting and receiving apparatus. The signals are transmitted from the Bureau station, W W V, Washington, D.C., and from station 6XBM, Stanford University, California.