384. SS P. Langley—Allegheny System of Time Signals. 
even this is not quite reliable where the circuit is a long 
one. The clocks described have subsidiary apparatus en: 
abling them to send controling currents on the Jones’ plan, 
but thus far its use has been confined to the observatory. 
The whole work, external to the observatory, has therefore 
been hitherto done by the sending of signals, through which 
distant clocks may be regulated, but without employing means 
for their contro/, and though this is done over a very extende 
field, a brief description of it, under the three divisions to 
which it naturally falls, will suffice. 
1st. The supply of time to watchmakers and jewellers. ee 
_ “jewelers wire” passes through the Western Union Telegrap 
almost if not quite all of the clocks and watches of the city are 
thus at sitendhand regulated. There is, in this uniform an 
many lost minutes in the day to eac rson in a city, a 
their aggregate represents a large draft upon the time of the 
business public, disappear. ae 
Applications have been received from watchmakers 1n poe y 
boring cities and at a considerable distance from Pittsburgh, !F 
this telegraphic supply of the time, which it has not always 
en possible to accommodate, but which have been welcome 
as showing a public appreciation of the utility of the work. 
2d. The supply of time to railroads. The watchmakers and 
jewelers are in telegraphic connection with the 
1ent * 
observatory by a wire which is devoted to their use, but dis - 
