47 
method of a falling indicator, and the lighting up or extinguishing 
of other little lampg tells the operator when the ‘called ” sub- 
scriber has answered, and when each subscriber has finished his 
conversation, Thus, after a call is once “ through,” the operator 
has no necessity to again ‘‘ go in”’ on the line. 
On the second floor is the test room. The outside cables, 
carrying at present some 5,700 wires, open out on to the test 
board, which is so arranged that any line from outside can be 
readily connected to any line up to the switch board, each wire 
being separately protected against lightning. Here also are fitted 
the ‘calling relays,” one for each subscriber’s line. When the 
subscriber takes his telephone off the hook, the relay is actuated, 
and lights up the calling lamp on the switch board, the ‘‘ cut- 
off” relay adjoining being actuated when the operator answers, 
and by cutting off the current automatically extinguishing the 
calling lamp. Close by is the meter rack, in which are fitted 
the automatic meters which record the number of completed 
conversations against the telephone numbers of the subscribers 
originating the calls, the line lamp rack and test clerk’s table 
completing the equipment. 
The battery room in the basement accommodates a battery 
of eleven accumulator cells of 23 plates each, for supplying 
current for working the board, both for “signalling” and 
‘talking’ purposes, with four smaller cells of seven plates each 
for working the automatic meters. These cells are charged from 
a motor-generator, of which there are two in the power room 
adjoining, together with the necessary starting switches, measur- 
ing instruments, etc. In one corner are the two motor ringing 
machines for supplying current for ringing on subscribers’ lines ; 
the repeater coil rack and fuse alarm board complete the equip- 
ment. The fuse alarm board is fitted with fuses to protect all 
the various circuits on the Exchange. 
In the Brighton telephone area some twelve million messages 
are carried annually over the National service, there being 5,555 
stations working at present. At the conclusion of. the visit the 
President, Dr. Walter Harrison, thanked Mr. Taylor and his 
colleagues for their kindness in devoting an afternoon to con- 
ducting the visitors over the Exchange, and for their interesting 
explanations and demonstrations. 
