Buzzer

A buzzer or beeper is an audio signalling device, which may be mechanical, electromechanical, or piezoelectric. Typical uses of buzzers and beepers include alarm devices, timers and confirmation of user input such as a mouse click or keystroke.

History

Electromechanical

The first electric buzzer was invented in 1831 by Joseph Henry. They were mainly used in early doorbells until they were phased out in the early 1930s in favor of musical chimes, which had a softer tone.

Piezoelectric

Piezoelectric buzzers, or piezo buzzers, as they are sometimes called, were invented by Japanese manufacturers and fitted into a wide array of products during the 1970s to 1980s. This advancement mainly came about because of cooperative efforts by Japanese manufacturing companies. In 1951, they established the Barium Titanate Application Research Committee, which allowed the companies to be "competitively cooperative" and bring about several piezoelectric innovations and inventions.

Type of buzzers

Electromechanical

Buzzer (whirligig)

A buzzer (buzz, bullroarer, button-on-a-string), is an ancient mechanical device used for ceremonial purposes and as a toy. It is constructed by centring an object at the midpoint of a cord or thong and winding the cord while holding the ends stationary. The object is whirled by alternately pulling and releasing the tension on the cord. The whirling object makes a buzzing or humming sound, giving the device its common name.

A buzzer is often constructed by running string through two of the holes on a large button and is a common and easily made toy.

American Indians used the buzzer as a toy and, also ceremonially, as to call up the wind. Early Indian buzzers were constructed of wood, bone, or stone, and date from at least the Fourche Maline Culture, c. 500 B.C.

See also

References

Bibliography

Buzzer (disambiguation)

A buzzer is a signalling device.

Buzzer or The Buzzer may also refer to:

Use

Use may refer to:

or to:

See also

United States Employment Service

The United States Employment Service (abbreviated as USES) is an agency of the United States government responsible for "assisting coordination of the State public employment services in providing labor exchange and job finding assistance to job seekers and employers". In around 1890, both the United States and European governments created the first federally funded employment offices. These offices were made to provide work for unskilled laborers that were unemployed. Due to the high number of economic depressions in the United States and Europe in the late 19th century and early 20th century in addition to high immigration rates to the United States, many people were unemployed, illiterate, and unskilled in terms of the workforce. These services proved to be unsuccessful and required more government interaction. Therefore in 1933, with the Wagner-Peyser Act, the USES was reinstated “to set minimum standards, develop uniform administrative and statistical procedures, publish employment information, and promote a system of "clearing labor" between states.” The USES was helpful during the Great Depression, providing work for those that had lost their jobs. President Franklin D. Roosevelt had created many government funded work projects to help boost the economy during the Great Depression and the USES was responsible for hiring the workers on those projects. The USES operated originally in only a few states but by World War II, it was operating in all states and played a major role in providing jobs during the war. In the United States home front during World War II, the service coordinated employment of Prisoners of War (e.g., using German POWs at Gettysburg for local pulpwood cutting).