Someone attended me on some interesting patents by Benitez. I uploaded them to my server:
Bestandsoverzicht van /pdf/Patents/Benitez/
These may be interesting to study in relation to Gray's work, too.
In this patent, he describes a.o. a magnetically quenched spark gap and an old school, electrolytic capacitor like rectifier:
http://www.tuks.nl/pdf/Patents/Benitez/GB121561A.pdf
He refers to this arc as a Poulsen arc lamp:
Arc converter - Wikipedia, the free encyclopedia
More on arc oscillators and Poulsen here:
Adventures in CyberSound: Poulsen, Valdemar
Adventures in CyberSound: Experiments with "Singing Arc" and Tesla Coil
Wireless Telegraphy and High Frequency Electricity: Wireless Telephony chapter (1909)
Howeth: Chapter XI (1963)
Soundmachines » magical sound machines
Update:
So, according to Arc converter - Wikipedia, the free encyclopedia , there is a difference between a spark gap transmitter and a Poulsen Arc converter.
The spark gap transmitter:
The Poulsen Arc converter:
Adventures in CyberSound: Experiments with "Singing Arc" and Tesla Coil
The difference is that with the spark gap transmitter, the spark gap is used to charge C2, and you get a dampening wave. With the Poulsen converter, the negative resistance effect of the spark gap is used to get an undamped or continious wave. Note that with the spark gap transmitter you have the cap in parallel with the coil, while with the Poulsen arc, you have them in series.
Bestandsoverzicht van /pdf/Patents/Benitez/
These may be interesting to study in relation to Gray's work, too.
In this patent, he describes a.o. a magnetically quenched spark gap and an old school, electrolytic capacitor like rectifier:
http://www.tuks.nl/pdf/Patents/Benitez/GB121561A.pdf
He refers to this arc as a Poulsen arc lamp:
Arc converter - Wikipedia, the free encyclopedia
Unlike the spark-gap transmitter converter, the arc converter produces undamped or continuous waves (CW). This was an important feature as the use of damped waves resulted in lower transmitter efficiency and communications effectiveness, while covering the r.f. spectrum with interference. This more refined method for generating continuous-wave radio signals was initially developed by Danish inventor Valdemar Poulsen. The Poulsen arc converter can be likened to a continuous-duty-rated electric arc welder with a tuned circuit connected across the arc. The negative resistance characteristics of an electric arc permits the creation of a relaxation oscillator that converts direct current to radio frequency energy. The arc converter consisted of a water-cooled bronze chamber in which the arc burned in hydrogen gas between a carbon cathode and a water-cooled copper anode. Above and below this chamber there were two series field coils surrounding and energizing the two poles of the magnetic circuit. These poles projected into the chamber, one on each side of the arc to provide a magnetic field. This field helps to stabilize the arc and improve overall conversion efficiency. In today's world one can still find oscillators based on negative resistance devices; the tunnel diode is one of them.
Adventures in CyberSound: Poulsen, Valdemar
Adventures in CyberSound: Experiments with "Singing Arc" and Tesla Coil
Wireless Telegraphy and High Frequency Electricity: Wireless Telephony chapter (1909)
Howeth: Chapter XI (1963)
Soundmachines » magical sound machines
Update:
So, according to Arc converter - Wikipedia, the free encyclopedia , there is a difference between a spark gap transmitter and a Poulsen Arc converter.
The spark gap transmitter:
The Poulsen Arc converter:
Adventures in CyberSound: Experiments with "Singing Arc" and Tesla Coil
The difference is that with the spark gap transmitter, the spark gap is used to charge C2, and you get a dampening wave. With the Poulsen converter, the negative resistance effect of the spark gap is used to get an undamped or continious wave. Note that with the spark gap transmitter you have the cap in parallel with the coil, while with the Poulsen arc, you have them in series.
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