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| INTERCOMMUNICATION TELEPHONES MASTER STATION LOUDSPEAKER SYSTEM
An incoming call causes the name or number of the caller to be illumined in the designation strip below the keys, and operates a buzzer in the instrument. The integral loudspeaker is satisfactory for offices of average size. For large or noisy offices a modern transistorised amplifier can be incorporated.
The matt polished hardwood case tones with the chocolate-bronze of the plastic grill and the key mounting. Green key handles and a polished black strip below the grill add distinction to the set. In the centre of the grill is a red Engaged lamp. The key and lamp mounting is removable from the front. Other parts arc accessible from the rear. A cord connects the instrument to a desk terminal block. On N1747B1 and N1747B2 the five keys on the extreme right are replaced by moulded plates. The key for the second master station line on the N1747B2 and N1747B4 instruments is on the left and has a red handle. POWER SUPPLY SIDE STATION TELEPHONES INSTALLATION The sizes of cables used depend upon the requirements of the particular system. A price per yard (914 mm.) of cable of the appropriate sizes for the job is usually given.
N1747B1 shown right These were made obsolete in 1971. |
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Last revised: April 29, 2025FM2 |
The loudspeaker telephone is designed for the convenience of busy executives
who need freedom of movement in order to consult references or make notes during telephone
conversations, as the only action necessary to originate or answer a call is the operation
of the lever key associated with the line concerned. Thus communication is established in
the minimum of time. (Type N1747B3 shown to the right).
The handset is used when privacy is desired, in which case the loudspeaker is
automatically cut out. When two master stations are in communication, one of them must use
the handset.