[ 46 | 
VIL. 
PROPOSAL FOR THE UTILIZATION OF THE ‘«‘ MARCONI” 
SYSTEM OF WIRELESS TELEGRAPHY FOR THE 
CONTROL OF. PUBLIC AND OTHER CLOCKS. By 
SIR HOWARD GRUBB, F.R.S., VICE-PRESIDENT, R.D.S. 
[Read January 18; Received for Publication January 21; 
Published Marcu 25, 1899.] 
In a Paper read before this Society last November on “ The 
Correction of Errors in the Distribution of Time Signals,” I 
described a scheme of time distribution suitable for a large in- 
stitution containing some two hundred rooms, all of which it was 
desirable to have furnished with clocks synchronized with one 
another, and controlled from one central clock. This central 
or distributing clock was itself to be controlled from the best 
procurable standard timekeeper placed under exceptionally favour- 
able conditions, and was further checked and corrected once 
every twenty-four hours by an electric signal from Greenwich 
Observatory. 
The scheme proposed in the Paper referred to dealt only with the 
control of clocks in the one building, but I incidentally mentioned 
that the Royal Dublin Society had some years ago established a 
system of synchronized clocks in Dublin controlled from a central 
clock in this building, and that for some time this system worked 
satisfactorily, and proved a great convenience to the citizens, but 
with the introduction of the telephone system, and the multiplica- 
tion of the telegraph wires, troubles arose from induction and 
other causes which finally necessitated the abandonment of the 
system. 
Adventitious currents produced by induction or other causes 
which, in the case of telephone and telegraph circuits, produce but 
a slight error or gap in the messages, cause errors in synchronized 
clocks which remain permanent until corrected by human attention, 
and practically destroy the value of the installation. 
