The Thermionic Valve and Its Developments in Radio-telegraphy and Telephony |
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aerial alternating current amplifying anode applied arrangement atom audion battery carbon filament cascade characteristic curve coil cold electrode collecting plate condenser conductivity conductor connected coupled Crystal Detector cylinder device direct current dynatron E. H. Armstrong Edison effect electric oscillations electrons emission employed equation exhausted Fleming valve Fleming's frequency galvanometer gases grid and plate grid circuit grid potential H. J. Round heated Hence high vacuum hot cathode incandescent filament incandescent lamp increase inductance invention ionisation ions J. J. Thomson Lee de Forest magnetic Marconi mercury method milliamperes oscillation circuit oscillation valve Patent Specification plate circuit plate current Pliotron potential difference potentiometer pump radio radiotelegraphy radiotelephony receiving circuit reception rectifying relay resistance sensitive shown in Fig signals temperature terminal thermionic current thermionic emission thermionic valve three-electrode thermionic three-electrode valve transformer transmitter tube tuned tungsten vacuous space vacuum valve vessel voltage volts waves Wireless Telegraph Company wireless telegraphy
Popular passages
Page 272 - The contention that Fleming's patent, whatever its original merit or lack thereof, was voided by an unlawful disclaimer, is without substance. The mistake (if there was one) was in claiming something not needed, and the disclaimer abandoned what was not wanted, without broadening or enlarging any claim ; it also left the claims fully supported by the original specification. No injury to defendant, or any one, else, is shown. The procedure is within Carnegie Steel Co. v. Cambria Iron Co., 185 US 403,...
Page 31 - Cycloid. The cycloid is a curve generated by a point on the circumference of a circle which rolls on a straight line tangent to the circle.
Page 259 - This invention relates to certain new and useful devices for converting alternating electric currents and especially high-frequency alternating electric currents or electric oscillations into continuous electric currents for the purpose of making them detectable by and measurable with ordinary direct-current instruments, such as a "mirror-galvanometer" of the usual type or any ordinary direct-current ammeter.
Page 117 - ... 37. At a receiving station In a system of wireless telegraphy employing electrical oscillations of high frequency, a detector comprising a vacuous vessel, two conductors adjacent to, but not touching, each other in the vessel, means for heating one of the conductors, a circuit outside of the vessel connecting the two conductors, means for detecting a continuous current in the circuit, and means for impressing upon the circuit the received oscillations.
Page 260 - ... (1,700° centigrade), it should be of carbon, preferably in the form of a filament such as is used in any ordinary incandescent electric lamp. The cold conductor may be of many materials, but I prefer a bright metal, such as platinum or aluminium or else carbon. The two conductors are enclosed in a glass bulb similar to that of an incandescent lamp, and I generally heat the carbon filament to a high state of incandescence by a continuous electric current, the electrical connection to the filament...
Page 54 - On the Conversion of Electric Oscillations into Continuous Currents by means of a Vacuum Valve,
Page 259 - I have discovered that if two conductors are enclosed in a vessel in which a good vacuum is made, one being heated to a high temperature, the space between the hot and cold conductors possesses a unilateral electric conductivity, and negative electricity can pass from the hot conductor to the cold conductor but not in the reverse direction.
Page 272 - gaseous medium" of the audion is nothing but the commercial vacuum of the ordinary electric light bulb — air being a gas, and the bulb containing some residual air. In other words, defendant uses the same "vacuous vessel" that Fleming does. As for the "trigger action," "audion effect," and such-like clever phrases, they merely hide the real inquiry, viz. how do the high frequency oscillations, or any part of them, or their electrical result or influence, get into the indicator or battery circuit,...
Page 47 - No. 307,031. Utilization of the Edison effect does not mean that the use of Edison's apparatus or any modification thereof as a detector was easy or simple. The admitted fact that years passed, and detectors of various kinds from the coherer to the crystal acquired vogue, before any one thought of using Edison's curiosity of electricity for the discovery or translation of Hertzian waves, is proof enough on this point. Fleming was the first to disclose an apparatus for this purpose. His specification...
Page 48 - ... invention or validity. The patentee may not understand his own mechanism ; but if he shows and describes it, and it produces a new result, the law is satisfied. Van E.pps v. United, etc., Co., 143 Fed. at page 872, 75 CCA 77. Therefore the first question (as stated by appellee) is substantially this : Was it invention to use, "as a detector of wireless waves, an Edison hot and cold electrode lamp"? This is a question of fact, and we arrive at the conclusion of the lower court that at the date...