Reginald Fessenden and Fessenden oscillator, around 1914Design and photograph of a Fessenden oscillator, with copper cylinder, soft iron core, AC winding, DC coil and 1.9 cm thick steel diaphragmPortrait photograph of Reginald Fessenden from Harper's Weekly Magazine, 1903
A Fessenden oscillator is an electro-acoustic transducer invented by Reginald Fessenden, with development starting in 1912 at the Submarine Signal Company of Boston.[1] It was the first successful acoustical echo ranging device. Similar in operating principle to a dynamic voice coil loudspeaker, it was an early kind of transducer, capable of creating underwater sounds and of picking up their echoes.
The creation of this device was motivated by the RMS Titanic disaster of 1912, which highlighted the need to protect ships from collisions with icebergs, obstacles, and other ships. Because of its relatively low operating frequency, it has been replaced in modern transducers by piezoelectric devices.
^Frost, Gary Lewis (2001). "Inventing Schemes and Strategies: The Making and Selling of the Fessenden Oscillator". Technology and Culture. 42 (3): 462–488. doi:10.1353/tech.2001.0109. S2CID 110194817. Project MUSE 33762.
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A Fessendenoscillator is an electro-acoustic transducer invented by Reginald Fessenden, with development starting in 1912 at the Submarine Signal Company...
alternator: used by Fessenden for his first radio broadcast. Fessendenoscillator List of Bishop's College School alumni Reginald Fessenden patents Sonar Citations...
first commercial echo sounding units was the Fessenden Fathometer, which used the Fessendenoscillator to generate sound waves. This was first installed...
II, named in honor of Reginald FessendenFessenden (guitars), a pedal steel guitar manufacturer Fessendenoscillator, an underwater sound projector This...
bells were quickly replaced by the Fessendenoscillator, a transducer, after its invention by Reginald Fessenden with development starting in 1912 at...
ranging (detecting an iceberg at a 2-mile (3.2 km) range). The "Fessendenoscillator", operated at about 500 Hz frequency, was unable to determine the...
CW and SSB signals. The beat frequency oscillator was invented in 1901 by Canadian engineer Reginald Fessenden. What he called the "heterodyne" receiver...
invented the triode vacuum tube oscillator. In a 1905 patent, Fessenden stated that the frequency stability of his local oscillator was one part per thousand...
competitive with the primitive maritime radionavigation. The later Fessendenoscillator allowed communication with submarines. In general the modulation...
devices, operating at ultrasonic frequencies, superseded the earlier Fessendenoscillator. In France in 1917, Paul Langevin and his coworkers developed an...
determining dots from dashes difficult. In 1905, Canadian inventor Reginald Fessenden came up with the idea of using two Alexanderson alternators operating...
reached depths of below 200 feet (61 m). Some submarines contained Fessendenoscillator systems. Her complement was three officers and 28 men. Operating...
reached depths of below 200 feet (61 m). Some submarines contained Fessendenoscillator systems. Her complement was three officers and 28 men. During World...
S2CID 51658533. Fay, H. J. H. (18 March 2009). "Submarine Signaling-FessendenOscillator". Journal of the American Society for Naval Engineers. 29 (1): 101–113...
reached depths of below 200 feet (61 m). Some submarines contained Fessendenoscillator systems. Her complement was three officers and 28 men. E11 joined...
could produce intelligible output from a receiver. When the autodyne oscillator was advanced to self-oscillation, continuous wave Morse code dots and...
communication. On 23 December 1900, the Canadian inventor Reginald A. Fessenden became the first person to send audio (wireless telephony) by means of...
water by transmitting sound waves into water and timing the return Fessendenoscillator – Type of electro-acoustic transducer Sensor – Converter that measures...
patents were granted in Europe and the U.S., culminating in Reginald A. Fessenden's echo-ranger in 1914. Pioneering work was carried out during this time...
reached depths of below 200 feet (61 m). Some submarines contained Fessendenoscillator systems. Her complement was three officers and 28 men. When war was...
reached depths of below 200 feet (61 m). Some submarines contained Fessendenoscillator systems. Her complement was three officers and 28 men. E1 joined...
160ft design depth, 350ft crush depth ). Some submarines contained Fessendenoscillator systems. Her complement was three officers and 28 men. E14 took part...
thing; the heterodyne receiver invented by Reginald Fessenden in 1902. In this an electronic oscillator generated a radio signal at a frequency fo offset...
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