On Sat 2020-06-13T19:39:42-0700 Paul Eggert hath writ:
Although I haven't found sources for what practices were in place at the Eiffel Tower on March 10/11, 1911, I did find the following abstract on page 265 of Science Abstracts. Section B - Electrical Engineering. Vol. XIV. 1911. It suggests that an automatic relay was feasible at the Eiffel Tower in March 1911, as Norddeich was already doing that in 1910. And this source confirms that the Eiffel Tower was routinely broadcasting time signals near midnight by 1910.
Bulletin Horaire has an answer vol 3 no 46 is a history of timekeeping page 257 says The time signals, inaugurated on May 23, 1910, were given only at night, at 0h0m t. m. civil of Paris. From the following November 21, they were also given in daytime, at 11h.0m. The law of March 9, 1911 having adopted, for the legal time in France, that of the Greenwich meridian, the hours of emission were brought forward to 10h45m and 23h45m, from July 1, 1911 So Tour Eiffel may have broadcast one last set of midnight pulses on old Paris Mean Time at the June 30/July 1 boundary, or they may have omitted those pulses and waited until new 10:45 the next morning. -- Steve Allen <sla@ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB 260 Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 https://www.ucolick.org/~sla/ Hgt +250 m