On Monday, Portland's historic Messenger Bell, a fire alarm bell purchased in 1874, was relocated from the Portland Firefighter Memorial Triangle to the Fire Bureau Logistics Center. The move is ...

[Jake] used rigid and flexible conduit to connect the bell to a power source, and the control panel shown on the left. He uses the LED backlight of the bedside alarm clock to drive the base of a ...

A fire alarm system consists of a number of devices working together to detect and alert people through visual and audio signals whenever smoke or fire is present. These alarm signals may be activated ...