Fire Alarm Bell

iPhoneOgraphy – 28 Sep 2016 (Day 272/366)

An electric bell is a mechanical bell that functions by means of an electromagnet. When an electric current is applied, it produces a repetitive buzzing or clanging sound. Electric bells have been widely used at railroad crossings, in telephones, fire and burglar alarms, as school bells, doorbells, and alarms in industrial plants, but they are now being widely replaced with electronic sounders.

Fire alarm bells are divided into two categories: vibrating, and single-stroke. On a vibrating bell, the bell will ring continuously until the power is cut off. When power is supplied to a single-stroke bell, the bell will ring once and then stop. It will not ring again until power is turned off and on again. These were frequently used with coded pull stations.

The interrupter bell evolved from various oscillating electromechanical mechanisms which were devised following the invention of the electromagnet by William Sturgeon in 1823. One of the first was the oscillating electric wire invented by James Marsh in 1824. This consisted of a wire pendulum dipping into a mercury trough, suspended between the poles of an electromagnet. When current was passed through the wire, the force of the magnet made the wire swing sideways, out of the mercury, which broke the current to the magnet, so the wire fell back. The modern electric bell mechanism had its origin in vibrating “contact breaker” or interrupter mechanisms devised to break the primary current in induction coils. Vibrating “hammer” interrupters were invented by Johann Philipp Wagner (1839) and Christian Ernst Neeff (1847), and was developed into a buzzer by Froment (1847). John Mirand around 1850 added a clapper and gong to make the standard electric bell for use as a telegraph sounder. Other types were invented around that time by Siemens and Halske and by Lippens. The polarized (permanent magnet) bell used in telephones, which appeared about 1860, had its beginning in the polarized relay and telegraph developed by Werner Siemens around 1850.

Shot & Edited using iPhone 6+

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About The Inspiration Shots

My name is Tommy Too and I'm a newbie in photography and blogging. The intention of creating this blog is to share some of my work and to keep track the improvement of my photography skill. Nevertheless the most important thing is to getting feedback or comment from other professional photographer just like you.

Posted on September 28, 2016, in iPhoneOgraphy 366, Photography and tagged , , , , . Bookmark the permalink. 6 Comments.

  1. Love the angle and boldness from the red. Great shot.

    Liked by 1 person

  2. I am continuously impressed by your thorough research on the interesting history of common articles in our lives. I am sure you will eventually publish a book. Thank you for sharing your work with us!

    Liked by 1 person

  3. This article is thorough. Fire alarm bell is inconspicuous element of fire alarm system. But I read so detailed information from this article. Thanks.

    Liked by 2 people

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