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- Bell System Alarm Relay, circa 1965 - Connected to a telephone, this signal relay could extend typical ringtones. It amplified the volume of ringing, and distinctive tones could be created for incoming calls: chimes, horns, and vibrating bells. A system like this was useful in loud industrial settings and large spaces.
- circa 1965
- Collections - Artifact
Bell System Alarm Relay, circa 1965
Connected to a telephone, this signal relay could extend typical ringtones. It amplified the volume of ringing, and distinctive tones could be created for incoming calls: chimes, horns, and vibrating bells. A system like this was useful in loud industrial settings and large spaces.
- Bell System Alarm Relay, circa 1960 - Connected to a telephone, this signal relay could extend typical ringtones. It amplified the volume of ringing, and distinctive tones could be created for incoming calls: chimes, horns, and vibrating bells. A system like this was useful in loud industrial settings and large spaces.
- circa 1960
- Collections - Artifact
Bell System Alarm Relay, circa 1960
Connected to a telephone, this signal relay could extend typical ringtones. It amplified the volume of ringing, and distinctive tones could be created for incoming calls: chimes, horns, and vibrating bells. A system like this was useful in loud industrial settings and large spaces.
- Fire Alarm Register - Beginning in the mid-19th century, cities installed telegraph fire alarm systems. When a fire broke out, a person could activate the nearest fire alarm box to send a signal directly to the fire department. The signal was received and recorded by a register like this one. It converted the signal's electrical pulses into punches on the paper tape.
- Collections - Artifact
Fire Alarm Register
Beginning in the mid-19th century, cities installed telegraph fire alarm systems. When a fire broke out, a person could activate the nearest fire alarm box to send a signal directly to the fire department. The signal was received and recorded by a register like this one. It converted the signal's electrical pulses into punches on the paper tape.