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April 1902, American
Wireless petitioned Congress to extend the 1886 patent by ten years, but was unsuccessful, so it duly expired on October 4, 1903. In 1905, the New York Circuit Court further noted that the Dolbear patent was "inoperative, and that, even if operative, it operates by virtue of radically different electrical laws and phenomena" than the radio signaling used by Marconi.
315:
In 1899, The New
England Wireless Telegraph and Telephone Company, a subsidiary of the American Wireless Telephone and Telegraph Company, purchased Dolbear's 1886 patent, and filed a suit against Marconi for infringement. However, in March 1901, a United States Circuit Court dismissed the suit. In
305:
In 1883, Dolbear was able to communicate over a distance of a quarter of a mile without wires in the Earth. His device relied on conduction in the ground, which was different from later radio transmissions that used electromagnetic radiation. He received a U.S. patent for a wireless telegraph in
729:"Petition of the American Wireless Telegraph and Telegraph Company, of Philadelphia, Pa., Praying the Extension for Ten Years of Letters Patent No. 350,299, Being the Basic Patent for the Art of Wireless Telegraphy and Telephony Granted to Amos Emerson Dolbear in 1886",
319:
In 1868 Dolbear (while a professor at
Bethany College) invented the electrostatic telephone. He also invented the opeidoscope (an instrument for visualizing vibration of sound waves, using a mirror mounted on a membrane) and a system of
363:. Apparently in 1897, widespread newspaper reports of a cigar-shaped flying object started to circulate in the Midwest and Southwest. Responding to sightings previously reported in the Morning News, on April 17, 1897, one respected
240:, Ohio. While a student there, he had made a "talking telegraph" and invented a receiver containing two features of the modern telephone: a permanent magnet and a metallic diaphragm that he made from a
760:
338:
In 1899, after the demonstration by Ernest A. Hummel of the telediagraph, an apparatus allowing the transmission of pictures by wire, Dolbear claimed to have invented such an apparatus in 1864 (
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March of that year. His set-up used phones grounded by metal rods poked into the earth. His transmission range was at least as much as a half a mile and he received a patent for this device,
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324:. He authored several books, articles, and pamphlets, and was recognized for his contributions to science at both the Paris Exposition in 1881 and the Crystal Palace Exposition in 1882.
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had he been observant of patent office formalities, it is possible that the speaking telephone, now so widely credited to Mr. Bell would be garnered among his own laurels.
744:
The
Federal Reporter. Volume 138. Cases Argued and Determined in the Circuit Courts of Appeals and Circuit and District Courts of the United States. July–September, 1905
367:
farmer, C.L. McIlhany discovered such a craft had landed on his property, and reported two human operators, a pilot and an engineer, who gave their names as "
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327:
In 1897, Dolbear published an article "The
Cricket as a Thermometer" that noted the correlation between the ambient temperature and the rate at which
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patented his model. Later, Dolbear couldn't prove his claim, so Bell kept the patent. Dolbear lost his case before the U. S. Supreme Court, (
371:" and "A.E. Dolbear." The two operators performed minor repairs on their electrically powered lighter-than-air craft, then again flew away.
845:
454:, Vol. 31, No. 371 (November 1897), pp. 970–971. Published by The University of Chicago Press for The American Society of Naturalists
388:
The Art of
Projecting: A manual of experimentation in physics, chemistry, and natural history, with the porte lumière and magic lantern
989:
984:
964:
969:
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742:"Marconi Wireless Telegraph Co. of America v. De Forest Wireless Telegraph Co. (Circuit Court, S. D. New York. April 11, 1905.)",
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signals without wires. In 1899 his patent for it was purchased in an unsuccessful attempt to interfere with
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In 1876, Dolbear patented a magneto electric telephone. He patented a static telephone in 1879.
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245:
244:. He invented the first telephone receiver with a permanent magnet in 1865, 11 years before
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reported receiving newspaper clippings from a local lawyer and historian on the subject of
301:(R) and capacitor (H) connected in series between an elevated capacitor (H2) and earth (D).
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from 1868 until 1874. In 1874 he became the chair of the physics department at
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United States Senate
Documents, Volume 26 (4245), 57th Congress, 1st Session
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Concise
Encyclopedia of Tufts History - Dolbear, Amos Emerson, 1837–1910
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209:
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Circuit of
Dolbear's wireless telephone, from his 1882 patent. The
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32:
208:. He is known for his 1882 invention of a system for transmitting
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168:
148:
142:
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Modes of Motion: Mechanical conceptions of physical phenomena
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chirp. The formula expressed in that article became known as
632:
Sarkar, T. K.; Mailloux, Robert; Oliner, Arthur A. (2006).
136:
119:
232:, Connecticut, on November 10, 1837. He was a graduate of
159:
125:
356:
176:; November 10, 1837 – February 23, 1910) was an American
289:(G). One side of the high voltage secondary winding is
184:. Dolbear researched electrical spark conversion into
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He died at his home in
Medford on February 23, 1910.
312:, in 1886. (He did not patent his system in Europe.)
145:
128:
761:"Stephenville area's had its share of UFO sightings"
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165:
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586:(25). The Scientific American Publishing Co.: 384.
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493:"What is the definition of Amos emerson dolbear?"
250:Dolbear et al. v. American Bell Telephone Company
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860:
829:
618:. New York: Dodd, Mead, and Co. pp. 94–99.
466:Apparatus for transmitting sound by electricity
297:(H1). The receiver (B) consists of a battery,
788:The great airship mystery: A UFO of the 1890s
293:(C) the other side connected to an elevated
31:
754:
752:
638:. John Wiley and Sons. pp. 254–255.
867:Cabinet of Wonders (February 13, 2008).
615:A History of Wireless Telegraphy, 3rd Ed
541:
539:
268:
836:Cabinet of Wonders (February 3, 2008).
683:. New York. October 18, 1899. p. 4
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555:. Medford. February 24, 1910. p. 9
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424:First Principles of Natural Philosophy
869:"The faces of phantom airship pilots"
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763:. Dallas Morning News. Archived from
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605:
440:
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838:"The Stephenville phantom airship"
277:(A) consisted of an electrostatic
14:
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895:
759:Biffle, Kent (February 4, 2008).
658:"Mode of Electric communication"
252:). The June 18, 1881, edition of
990:People from Norwich, Connecticut
985:20th-century American physicists
965:19th-century American physicists
813:Solving the 1897 Airship Mystery
703:"Suit Against Marconi Dismissed"
436:, Boston, Lee and Shepard, 1897
406:The Telephone and how to make it
112:
97:
970:Ohio Wesleyan University alumni
960:20th-century American inventors
955:19th-century American inventors
811:Busby, Michael (January 2004).
736:
723:
574:Dolbear, Amos (June 18, 1881).
418:, Boston, Lee and Shepard, 1892
400:, Boston, Lee and Shepard, 1877
391:, Boston, Lee and Shepard, 1877
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975:University of Kentucky faculty
911:Works by or about Amos Dolbear
815:. Pelican Publishing Company.
733:, Document No. 346, pages 1–3.
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220:patents in the United States.
1:
664:October 5, 1886. Lines 51–55.
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285:in the primary circuit of an
448:The Cricket as a Thermometer
427:, Boston, Ginn and Co., 1897
409:, London, Sampson Lowe, 1878
351:In 2008, Kent Biffle of the
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7:
1000:Scientists from Connecticut
930:A portrait of Prof. Dolbear
925:Roxbury's Professor Dolbear
719:– via Newspapers.com.
711:. March 23, 1901. p. 7
691:– via Newspapers.com.
612:Fahie, John Joseph (1902).
563:– via Newspapers.com.
10:
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995:Inventors from Connecticut
547:"Prof Dolbear Passes Away"
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415:Matter, Ether, and Motion
228:Amos Dolbear was born in
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980:Tufts University faculty
675:"A Suit Against Marconi"
576:"A new telephone system"
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234:Ohio Wesleyan University
192:. He was a professor at
873:Cabinet of Wonders blog
842:Cabinet of Wonders blog
518:"Tufts Digital Library"
452:The American Naturalist
786:Cohen, Daniel (1981).
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264:
206:Medford, Massachusetts
194:University of Kentucky
75:Medford, Massachusetts
902:Works by Amos Dolbear
322:incandescent lighting
272:
260:
246:Alexander Graham Bell
37:Amos Dolbear, c. 1880
879:on February 18, 2008
680:The Washington Times
108:Amos Emerson Dolbear
57:Norwich, Connecticut
767:on October 28, 2008
661:U.S. patent 350,299
635:History of Wireless
580:Scientific American
471:U.S. patent 239,742
361:Stephenville, Texas
353:Dallas Morning News
309:U.S. patent 350,299
255:Scientific American
218:wireless telegraphy
190:electrical impulses
524:on January 4, 2014
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16:American physicist
906:Project Gutenberg
214:Guglielmo Marconi
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67:February 23, 1910
53:November 10, 1837
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915:Internet Archive
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875:. Archived from
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848:on March 3, 2008
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881:. Retrieved
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769:. Retrieved
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69:(1910-02-23)
25:Amos Dolbear
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950:1910 deaths
945:1837 births
746:, page 668.
502:January 24,
369:S.E. Tilman
295:capacitance
275:transmitter
186:sound waves
939:Categories
479:References
279:microphone
258:reported:
49:1837-11-10
883:April 26,
852:April 26,
771:April 26,
715:March 14,
687:March 14,
559:March 14,
528:April 14,
224:Biography
210:telegraph
198:Lexington
178:physicist
92:Signature
597:June 15,
592:26075824
329:crickets
299:earphone
281:(T) and
238:Delaware
182:inventor
913:at the
621:Alt URL
459:Patents
291:earthed
283:battery
242:tintype
230:Norwich
819:
794:
642:
590:
588:JSTOR
380:Books
236:, in
885:2009
854:2009
817:ISBN
792:ISBN
773:2009
717:2022
689:2022
640:ISBN
599:2022
561:2022
530:2014
504:2024
345:).
188:and
180:and
64:Died
43:Born
904:at
450:".
357:UFO
216:'s
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196:in
169:ɛər
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840:.
751:^
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