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The most widely used form is the interrupter bell, which is a mechanical bell that produces a continuous sound when current is applied. See animation, above. The bell or gong (B), which is often in the shape of a cup or half-sphere, is struck by a spring-loaded arm (A) with a metal ball on the end called a clapper, actuated by an electromagnet ...
Rooms were fitted with bell pulls or levers which a household member could pull. A system of wires connected the pull to a bell in a service area, in stairwells or outside servants' rooms. [1] The bells were fixed to a board and each bell was individually labelled so servants could see which room requested service. [1] Bells hung from coiled ...
Western Electric 202 hand telephone set as refurbished in the late 1930s and 1940s with new handset style. The low-profile 684A subset (1931) is mounted on wall in background. When designating anti-sidetone apparatus, the Bell System practice was to add the value 100 to the apparatus code of the corresponding sidetone equipment. [34]
The Western Electric 500-type telephone replaced the 300-type, which had been produced since 1936. The model 500 line was designed by the firm of industrial designer Henry Dreyfuss, the product of several years of research and testing in collaboration with Bell Laboratories and Western Electric. Development started in 1946 with early sketches ...
Diagram of a Zamboni pile The Oxford Electric Bell, believed to be powered by Zamboni pile batteries. The Zamboni pile (also referred to as a Duluc Dry Pile [1]) is an early electric battery, invented by Giuseppe Zamboni in 1812. A Zamboni pile is an "electrostatic battery" and is constructed from discs of silver foil, zinc foil, and paper.
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The rotary dial version with ringer was known as the 702B, while the modular cord variant was labeled 702BM. The model 711B had a slide switch or push-button and was a two-line phone with exclusion on the first line. The ten-button Touch Tone version was known as the 1702B, and when twelve-button keypad were introduced the phone was labeled as ...
For example, a recipe calling for "one stalk" of celery might actually mean the entire bunch, not just one rib. Using only one rib is such cases could lead to a dish with a much milder flavor than ...