Fire alarm call box
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A fire alarm box, fire alarm call box, or fire alarm pull box is a device used for notifying a fire department of a fire or a fire alarm activation. Typically installed on street corners or on the out
Fire alarm call box (Somerville, Massachusetts)
Combined police telephone and fire alarm (San Francisco)
A box card used by the Chicago Fire Department
Patent drawing depicting the signal station (alarm box), the central dispatching station, and the alarm station at the fire house.
Chart recorder
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A chart recorder is an electromechanical device that records an electrical or mechanical input trend onto a piece of paper. Chart recorders may record several inputs using different color pens and may
Fire alarm call box
…electrical signal corresponding to the box's number. A receiver at fire headquarters announces the alarm through flashing lights or tones, or via a pen recorder, and the box number is matched to a list of box locations. In modern installations a computer receives and translates the pulses; in unmanned installations…
A section of circular chart recorder paper
Chart recorders of a control panel at a water purification plant record water flow rates at different stages of the process.
A circular chart recorder tracking temperature in a building