Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

Cast iron box/ Brass lever/ wood base/ Brass trigger configuration.

Dimensions

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

31,2 cm

Largeur

28,0 cm

Hauteur

11,5 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Lutte contre les incendies

Catégorie

Alarmes

Sous-catégorie

S/O

Fabricant

Ou

Inconnu

Pays

Inconnu

État/province

Inconnu

Ville

Inconnu

Contexte

Pays

Inconnu

État/province

Inconnu

Période

Inconnu

Canada

Type of device made and used in Canada to alert firefighters in a fire department, of the presence of a fire in the neighbourhood where the alarm box is situated.

Fonction

To rapidly transmit an alarm of fire to a firefighting force.

Technique

This is the inner case of an alarm box. Could very well be part of 1971.0445. Inside is the clockwork operating mechanism. Pulling the lever raised a weight allowing its gravity drop to motivate the clockwork mechanism. This was the preferred technology in northern climates over the spring technology. The first practical fire alarm system was developed in Boston in1852, by Dr. William Channing and Moses Farmer. It worked on the principal of telegraphy: a signal was sent long distances over wires, by electric transmission. "In the first boxes, a notched code wheel was turned by a crank handle in the front of the box. Then, it evolved with a spring-driven, clockwork-type mechanism which drove the code wheel when activated by a lever." Boxes were put on a pedestal or telephone pole at a street corner. Early boxes were locked with keys which were given to the citizens and policemen who had the responsibility of pulling the lever in the event of a fire. In 1875 a model was made that did not need a key. In 1922, the quick-action door was put on the market. There are two main components that make up this kind of fire alarm system: the telegraph mechanism, located on a street corner, and the alarm apparatus (gongs and indicators), located inside a fire department's Headquarters. One-way communication between the telegraph and alarm system was made possible by linking both boxes with aerial and/or ground-level wires. Central station equipment would receive the signal, revealing the location of the fire, and would proceed to notify the firehouse nearest to the fire by transmitting another signal to their alarm box.

Notes sur la région

Inconnu

Détails

Marques

S/O

Manque

S/O

Fini

Box painted red on all sides and black inside/ Air slot in door with brass finger lever/ Inside are clockworks, telegraph sounder and relay with black cast weight/ Relay coils in green/ Telegraph sounder on wood base/ Brass trigger configuration on inside door shaped.

Décoration

S/O