Toledo Fire Alarm box number 72 is on display at the Toledo Firefighters Museum in Toledo Ohio . I photographed it using my Konika-Minolta DiMage A2 DSLR camera set at f 3.5 and ISO 200. The exposure here was 1/100 sec. with flash.
The American District Telegraph Company (ADT) was contracted to operate the fire alarm system in Toledo and they supplied their own alarm boxes. This arrangement ending when the city established their own fire alarm system. Toledo installed 258 of these Gamewell Company boxes and began operation of the system in February 1899.
It was a telegraph system. When someone pulled the alarm, the box sent a signal in morse code indicating the box number, and repeated this message several times. The operater at the fire communications center would relay the number throughout the system, so the station in the district where the box was located would get the message and respond.