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amos dolbear wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 biography 2 publications toggle publications subsection 2 1 books 2 2 journal articles 2 3 patents 3 references 4 external links toggle the table of contents amos dolbear 12 languages تۆرکجه deutsch فارسی français հայերեն bahasa indonesia italiano malagasy polski português русский shqip edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikisource wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia american physicist amos dolbear amos dolbear c 1880 born 1837 11 10 november 10 1837 norwich connecticut died february 23 1910 1910 02 23 aged 72 medford massachusetts known for dolbear s law signature amos emerson dolbear ˈ eɪ m ɒ s ˈ ɛ m ər s ən ˈ d ɒ l b ɛər 1 november 10 1837 february 23 1910 was an american physicist and inventor dolbear researched electrical spark conversion into sound waves and electrical impulses he was a professor at university of kentucky in lexington from 1868 until 1874 in 1874 he became the chair of the physics department at tufts university in medford massachusetts 2 he is known for his 1882 invention of a system for transmitting telegraph signals without wires in 1899 his patent for it was purchased in an unsuccessful attempt to interfere with guglielmo marconi s wireless telegraphy patents in the united states biography edit amos dolbear was born in norwich connecticut on november 10 1837 3 he was a graduate of ohio wesleyan university in delaware 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 tintype he invented the first telephone receiver with a permanent magnet in 1865 11 years before alexander graham bell patented his model citation needed later dolbear couldn t prove his claim so bell kept the patent dolbear lost his case before the u s supreme court dolbear et al v american bell telephone company the june 18 1881 edition of scientific american reported 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 4 in 1876 dolbear patented a magneto electric telephone he patented a static telephone in 1879 circuit of dolbear s wireless telephone from his 1882 patent the transmitter a consisted of an electrostatic microphone t and battery in the primary circuit of an induction coil g one side of the high voltage secondary winding is earthed c the other side connected to an elevated capacitance h1 the receiver b consists of a battery earphone r and capacitor h connected in series between an elevated capacitor h2 and earth d in 1883 dolbear was able to communicate over a distance of a quarter of a mile without wires in the earth 5 6 his device relied on conduction in the ground which was different from later radio transmissions that used electromagnetic radiation citation needed he received a u s patent for a wireless telegraph in 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 7 and he received a patent for this device u s patent 350 299 in 1886 he did not patent his system in europe 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 8 however in march 1901 a united states circuit court dismissed the suit 9 in 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 10 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 11 in 1868 dolbear while a professor at bethany college invented the electrostatic telephone citation needed he also invented the opeidoscope an instrument for visualizing vibration of sound waves using a mirror mounted on a membrane and a system of incandescent lighting citation needed 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 in 1897 dolbear published an article the cricket as a thermometer that noted the correlation between the ambient temperature and the rate at which crickets chirp the formula expressed in that article became known as dolbear s law 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 norwich bulletin 26 april 1899 he died at his home in medford on february 23 1910 3 in 2008 kent biffle of the dallas morning news reported receiving newspaper clippings from a local lawyer and historian on the subject of ufo sightings in stephenville texas 12 apparently in 1897 widespread newspaper reports of a cigar shaped flying object started to circulate in the midwest and southwest 13 14 responding to sightings previously reported in the morning news on april 17 1897 one respected erath county 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 s e tilman and a e dolbear 12 the two operators performed minor repairs on their electrically powered lighter than air craft then again flew away 15 16 publications edit books edit dolbear a e the art of projecting a manual of experimentation in physics chemistry and natural history with the porte lumière and magic lantern boston lee and shepard 1877 dolbear a e the telephone boston lee and shepard 1877 dolbear a e the telephone and how to make it london sampson lowe 1878 dolbear a e matter ether and motion boston lee and shepard 1892 dolbear a e first principles of natural philosophy boston ginn and co 1897 dolbear a e modes of motion mechanical conceptions of physical phenomena boston lee and shepard 1897 journal articles edit the cricket as a thermometer the american naturalist vol 31 no 371 november 1897 pp 970 971 published by the university of chicago press for the american society of naturalists patents edit apparatus for transmitting sound by electricity u s patent 239 742 april 5 1881 references edit what is the definition of amos emerson dolbear dictionary net retrieved january 24 2024 tufts digital library archived from the original on january 4 2014 retrieved april 14 2014 1 2 prof dolbear passes away the boston globe medford february 24 1910 p 9 retrieved march 14 2022 via newspapers com dolbear amos june 18 1881 a new telephone system scientific american 44 25 the scientific american publishing co 384 jstor 26075824 retrieved june 15 2022 fahie john joseph 1902 a history of wireless telegraphy 3rd ed new york dodd mead and co pp 94 99 alt url sarkar t k mailloux robert oliner arthur a 2006 history of wireless john wiley and sons pp 254 255 isbn 978 0471783015 mode of electric communication u s patent 350 299 october 5 1886 lines 51 55 a suit against marconi the washington times new york october 18 1899 p 4 retrieved march 14 2022 via newspapers com suit against marconi dismissed new york tribune march 23 1901 p 7 retrieved march 14 2022 via newspapers com 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 united states senate documents volume 26 4245 57th congress 1st session document no 346 pages 1 3 marconi wireless telegraph co of america v de forest wireless telegraph co circuit court s d new york april 11 1905 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 page 668 1 2 biffle kent february 4 2008 stephenville area s had its share of ufo sightings dallas morning news archived from the original on october 28 2008 retrieved april 26 2009 cohen daniel 1981 the great airship mystery a ufo of the 1890s dodd mead isbn 0 396 07990 3 busby michael january 2004 solving the 1897 airship mystery pelican publishing company isbn 1 58980 125 3 cabinet of wonders february 3 2008 the stephenville phantom airship cabinet of wonders blog archived from the original on march 3 2008 retrieved april 26 2009 cabinet of wonders february 13 2008 the faces of phantom airship pilots cabinet of wonders blog archived from the original on february 18 2008 retrieved april 26 2009 external links edit wikimedia commons has media related to amos dolbear physicist works by amos dolbear at project gutenberg works by or about amos dolbear at the internet archive concise encyclopedia of tufts history dolbear amos emerson 1837 1910 roxbury s professor dolbear a portrait of prof dolbear v t e telecommunications history beacon broadcasting cable protection system cable tv communications satellite computer network data compression audio dct image video digital media internet video online video platform social media streaming drums edholm s law electrical telegraph fax heliographs hydraulic telegraph information age information revolution internet mass media mobile phone smartphone optical telecommunication optical telegraphy pager photophone prepaid mobile phone radio radiotelephone satellite communications semaphore phryctoria semiconductor device mosfet transistor smoke signals telecommunications history telautograph telegraphy teleprinter teletype telephone history the telephone cases television digital streaming undersea telegraph line videotelephony whistled language wireless revolution pioneers nasir ahmed edwin howard armstrong mohamed m atalla john logie baird paul baran john bardeen alexander graham bell emile berliner tim berners lee francis blake jagadish chandra bose charles bourseul walter houser brattain vint cerf claude chappe yogen dalal donald davies daniel davis jr amos dolbear thomas edison philo farnsworth reginald fessenden lee de forest elisha gray oliver heaviside robert hooke erna schneider hoover harold hopkins gardiner greene hubbard bob kahn dawon kahng charles k kao narinder singh kapany hedy lamarr roberto landell innocenzo manzetti guglielmo marconi robert metcalfe antonio meucci samuel morse jun ichi nishizawa charles grafton page radia perlman alexander stepanovich popov tivadar puskás johann philipp reis claude shannon almon brown strowger henry sutton charles sumner tainter nikola tesla camille tissot alfred vail thomas a watson charles wheatstone vladimir k zworykin internet pioneers transmission media coaxial cable fiber optic communication optical fiber free space optical communication internet molecular communication radio waves wireless transmission line telecommunication circuit network topology and switching bandwidth links network switching circuit packet list nodes terminal telephone exchange multiplexing space division frequency division time division polarization division orbital angular momentum code division concepts communication protocol computer network data transmission store and forward telecommunications equipment types of network cellular network ethernet isdn lan mobile ngn public switched telephone radio television telex uucp wan wireless network notable networks arpanet bitnet cyclades fidonet internet internet2 janet npl network tanet toasternet usenet locations africa americas north south antarctica asia europe oceania global telecommunications regulation bodies telecommunication portal category outline commons authority control databases international isni viaf gnd fast worldcat national united states israel academics scopus zbmath people ddb other open library snac yale lux retrieved from https en wikipedia org w index php title amos_dolbear oldid 1374667856 categories 1837 births 1910 deaths 19th century american inventors 20th century american inventors 19th century american physicists ohio wesleyan university alumni university of kentucky faculty tufts university faculty 20th century american physicists people from norwich connecticut inventors from connecticut scientists from connecticut hidden categories articles with short description short description is different from wikidata use mdy dates from march 2022 biography with signature articles with hcards all articles with unsourced statements articles with unsourced statements from november 2021 cs1 unfit url commons category link is on wikidata articles with project gutenberg links articles with internet archive links this page was last edited on 13 september 2026 at 11 30 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents amos dolbear 12 languages add topic