‘ite: 
and its application to Fire Alarms 79 
fifth Signal Station in the Fourth District, of which the Box 
is represented in fig. 4, the person in charge of this Station, or, 
at night, a oe opens the Signal Box and turns the Crank 
six times. The Alarm at the Central Office is struck every time 
that the circuit is ies, and the Register records, at the same 
moment, the District Signal of four consecutive marks, six _ 
repeated, alternating with the Telegraphic ‘Signal, a dot, 
line and a dot, indicating the number of the fifth Station. The 
Agent at the ‘Central Office, if aroused at night by the Alarm, 
refers to the Register where he finds a distinct and permanent 
record. He turns immediately to the District Key-board and 
depresses the key of the fourth Distriet. The Battery is at once 
thrown on to the Alarm Circuits, arid the Signal of the fourth 
District, one, two, three, four, is steack upon the 19 Alarm” Bells 
at near arly the same instant of time, and continues to be repeated 
at short intervals as long as the key of the District is held down. 
he Agent, meanwhile, observes the motion of the numeral 
cylinders in one of the Alarm Bell Registers, fig. 7, and raises his 
finger from the key when a sufficient number of blows have been 
struck. He then turns to the Journal of the Office and entemabe 
time, and the number of the District and Station, from. i 
the alarm proceeded. es 
In the pe time the engines are running frontal” nar 
towards the District, and some officer of the Fire Department, 
opens one of the Signal Boxes i n passin , and makes the most 
sitnple signal, say one, one, one, oe “ writing dots,” by tapping on 
the Signal Key. This is eeaer by the Central Agent, who 
Proceeds at once, by means of th he key provided for that purpose, 
the flectro-magnets i in all nee 
Which the enquiry is made 
the exact Dist 
District shoul lack primarily on the alarm belle,4 any inguiey 
1 2 rendered unnecesssary, and a direction woul 
bi ‘ve faredahied to the place. of a fire, within the distance of 
yr 
At length the fire is suppressed, per rhaps- in a short time. A 
Y important function of the System is now to be developed. 
The engineer, on the ground, who has chief control, sends to 
nearest Signal Box and communicates the Signal one, one-lwo,— 
one, one-two, which signifies “ All Out.” This is received by 
the Agent at the Central Office, who immediately de oresses the 
Key of the District K Key-board, marked in fig. 6 with th chat 
