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

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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 ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern