In Bell Systems Technical Journal, v9:i1 January 1930, p78:
Time Service
Arrangements have been made in many parts of the country to
furnish subscribers who desire it, accurate information as to the
time of day. A subscriber wishing the information asks for or dials
a particular number assigned for this purpose and is connected either
to an operator who advises him individually as to the time or is
switched across a bus-bar to which is connected the amplified speech
of an operator repeating at fifteen second intervals the exact time
of day. In the present development of this service it is the practice
to localize in one place the time service for an entire exchange area.
http://www.alcatel-lucent.com/bstj/vol09-1930/bstj-vol09-issue01.html
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