tele1 - Outline u Visual Telegraphy Telegraphy u Telegraph...

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Unformatted text preview: Outline u Visual Telegraphy Telegraphy u Telegraph Lines u Telephone TELEGRAPH & TELEPHONE u Electric Visual Telegraphy u Claude Chappe (1763-1805) t Built By Abraham Bruguet (1793) Chappe Semaphore System u u Masonry Towers Wooden “T” t Horizontal Beam (Regulator) w w t Could Have Been Built Earlier (100 Years) t Jointed Arms (Indicator) w w w t Cranks & Ropes t First Stations w w u u t First Line w 196 Different Positions Chappe Code - 92 Positions t Diplomatic Dictionary w w t Second Dictionary - Phrases Chappe Semaphore System u Slowed Development Of Electric Telegraph w u Nothing New Technologically w u Calais To Paris t 33 Posts, 58 Leagues, 3 Minutes u Toulon To Paris t 10 Posts, 200 Leagues, 20 Minutes u Used u Still Extensively In WW I Used - Aircraft Carriers Electric Telegraphy u Electric Battery u Electromagnetism u First Electric Telegraphs u Relays u Alphabetical Devices u First French Telegraphic Devices u Printing Devices u Morse System u Telegraph Lines u Machinery & Electrical Industry 1 Electric Battery u Telegraph - Electric Current t Continuous u Conductor t Permanent u Voltaic Pile - Not Satisfactory Cesar Bequerel (1828) u J.F. Daniell (1836) u Electromagnetism t Two-Fluid Class t Daniell Cell t Reliable t Contiuous u Georges-Louis u Ampere (1820) t Deviation Of Magnetic Needle Schilling (1832) t Six Indicators & Six Wires First Electric Telegraphs u Euston w w w von Steinheil t Single Circuit (1827) t Return Current Through Ground (1828) & Camden In London (1837) t 40 Years After Chappe t 1 Mile Long t Sir William F. Cooke (1806-1879) t Sir Charles Wheatstone (1802-1875) t Five Needles & Circuits With Six Wires t Two Additional Wires u Carl-August Lesage (1774) t Dischages Of Static Electricity From Leydon Jar t 24 Wires For Alphabet t Underground - Conductors Insulated By Glass Electromagnetism (Continued) u Baron Traversed By Electric Current t Magnetic Needle Moves u Wheatstone & Clarke (1842) t Two Needle Instrument u Alexander Bain (1843) t Single Needle Instrument Five Needle Telegraph By W & C Local Circuit Of W & C Telegraph u u Left - Relay Right - Calling Device Wheatstone & Cooke (1837) u Top u t Receiver u Bottom t Transmitter 2 Transmitting-Receiving Post u Built By Wheatstone & Clarke (1842) t Two Needle Instrument t Right First Electric Telegraphs u Electromagnet (1820s) t Ampere & Arago t Coarse Wires With Few Coils w w t Left t Took 20 Years To Be Adopted In Telegraph w u Telegraphic Devices t Alphabetical Telegraph t Electric Telegraph With Chappe Signals t Morse System Relays Wheatstone (1837) Electrochemical u Close Circuit From A Distance u “U” Shaped Tube Relays Wheatstone (1839) Close Circuit From A Distance u Needle In Center Of Frame u u u u t Acidulated Water & Mercury t Current Causes Hydrogen To Be Liberated t Pressure Cause Mercury To Close Circuit Of Sounding Device Alphabetical Devices t Fork Shaped Contact At One End t Current Caused Fork To Plunge Into Containers Of Mercury t Closed Local Circuit First French Telegraphic Devices u u Wheatstone t Clock Movement At Each Post t Pointer Turned In Jerks u Many Variations t Replaced Needle Devices Louis Breguet (1844) t Same Concept As Wheatstone & Cooke t 2 Needles - Chappe System t Escapement u u Right - Transmitter Left - Receiver 3 First French Telegraphic Devices u Keyboard Sender Printing Devices u Wheatstone t Gustave Froment (1845) t Replaced Crank Sender Of Breguet’s t Replaced Dial And Pointer On Alphabetical w w Ÿ u John W. Brett (1805-1863) t Modified Keyboard Idea Of Froment Printing Devices Morse System u Samuel F. B. Morse (1791-1872) t Painter Turned Physicist & Mechanic w u David E. Hughes (18311900) t Best Idea t Synchonized t Numerous Biographies t Electromagnet With An Armature Holding A Stylus w w w w w t Lacked Experience In Making Electromagnets w w Morse System u Simplicity t Make Signal With A Simple Mechanical Device t Similar Movements Morse System u Manual Transmitter t Right - Flexible Blade (First Model) t Left - Jointed Lever Type With Reversing Spring w w t Single Code With 2 Elements w w Ÿ Ÿ Ÿ 4 Morse System u Telegraph Lines Perfected Morse System (1845) t Diagram Of Connections Baltimore To Washington (1845) u Adopted Throughout Europe (Beginning 1846) u International Communication (1854) u u Success Of Telegraph Depended On: t Transmitting & Receiving Devices t Batteries t Transmission Lines u First Lines t Iron Wires - Poor Results t Copper Wires - Tempted Thieves w w t Insulating Wires In Suspension Telegraph Lines Ring Insulator (1845) Insulator With Tension Devices (1845) u Porcelein Insulator (1860) Machinery & Electrical Industry u u u Telegraph Produced Numerous Inventions t Lightning Rods t Cummutators, Relays, Sound Devices, Galvanometers, Measuring Instruments t Telephone u New Occupations t Physicists To Electrical Engineering t First High Tech Occupation In The West Machinery & Electrical Industry u Pixii (1832) t Magnetoelectric Motor u Froment (1844) u Shown - Froment t Electric Generators t 8 Soft Iron Hubs t 4 Elctromagnets t Adapted (1855) w Telephone u Robert Hooke (1635-1703) t “Tis not impossible to hear a whisper a furlong’s distance, it having already been done; and perhaps the nature of the thing would not make it more impossible though that furlong should be ten times multiplied” u J. Philipp Reis (1834-1874) t First Practical Electric Telephone (1861) t Just A Toy 5 Telephone u 1876 t Alexander Graham Bell - Awarded Patent w t Elisha Gray - Superior Design u Alexander Graham Bell t Teacher Of Deaf t Used No External Power Source w t Transmitter & Receiver Nearly Identical t Electromagnetic Microphone 6 ...
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This note was uploaded on 06/12/2011 for the course EGN 3000 taught by Professor Staff during the Spring '09 term at University of South Florida.

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