Ernst alex anderson biography sampler

Ernst Alexanderson

Swedish-American electrical engineer and originator (–

Ernst Frederick Werner Alexanderson (Swedish:[ɛʂntalɛkˈsandɛʂɔn]; January 25, – May 14, ) was a Swedish-American bray engineer and inventor who was a pioneer in radio get up. He invented the Alexanderson alternator, an early radio transmitter reach-me-down between and the s send off for longwave long distance radio dispatch.

Alexanderson also created the amplidyne, a direct current amplifier stirred during the Second World Hostilities for controlling anti-aircraft guns.[2]

Background

Alexanderson was born in Uppsala, Sweden.[3] Stylishness studied at the University be required of Lund (–97) and was cultivated at the Royal Institute interrupt Technology in Stockholm and justness Technische Hochschule in Berlin, Deutschland.

He emigrated to the Concerted States in and spent practically of his life working reserve the General Electric and Cable Corporation of America.[4]

Engineering work

Alexanderson intended the Alexanderson alternator, an mistimed longwaveradio transmitter, one of honesty first devices which could send modulated audio (sound) over relay waves.

He had been occupied at General Electric for single a short time when Tight situation received an order from Canadian-born professor and researcher Reginald Fessenden, then working for the Inn Weather Bureau, for a specialised alternator with much higher currency than others in existence pressurize that time, for use translation a radio transmitter.

Fessenden esoteric been working on the complication of transmitting sound by air waves, and had concluded lose concentration a new type of air transmitter was needed, a connected wave transmitter. Designing a mechanism that would rotate fast stop to produce radio waves dutiful a formidable challenge. Alexanderson's kith and kin were convinced the huge turning rotors would fly apart deed kill him, and he chief up a sandbagged bunker proud which to test them.

Suspend the summer of Mr. Alexanderson's first effort, a 50 kHz alternator, was installed in Fessenden's radio station in Brant Sway, Massachusetts. By fall its production had been improved to theologist and 75&#;kHz. On Christmas Profess, , Fessenden made an cautious broadcast of Christmas music, together with him playing the violin, stray was heard by Navy ships and shore stations down nobleness East Coast as far type Arlington.

This is considered high-mindedness first AM radio entertainment broadcast.[5][6]

Alexanderson continued improving his machine, avoid the Alexanderson alternator became wide used in high power become aware of low frequency commercial and Seafaring wireless stations to transmit wireless traffic at intercontinental distances, unconfirmed by the s it was replaced by vacuum tube transmitters.

The only surviving transmitter be next to a working state is varnish the Grimeton radio station skin Varberg, Sweden. It is spruce prime example of pre-electronic receiver technology and was added primate a UNESCO's World Heritage Specification list in [7]

Alexanderson was besides instrumental in the development earthly television.

The first television radio in the United States was received in at his Subtlety Plot home at Adams Clue, Schenectady, N.Y.[8] The following day he developed the coordination method sound and movement on excellence first television drama, The Queen's Messenger. In , he conducted an early public demonstration nigh on his large screen television usage on a closed-circuit channel putrefy Proctors in Schenectady.[9][10][11][12][13]

Alexanderson retired stranger General Electric in The artificer and engineer remained active next an advanced age.

He long television research as a specialist for the Radio Corporation strain America filing his st unambiguous application in Over his duration, Alexanderson received US patents, probity last filed in at discretion He died in and was buried at Vale Cemetery surround Schenectady, New York.[14][15]

Alexanderson is additionally mentioned in connection with magnanimity emergence of the patent structure, that he was partially heavy to.

As the technology chronicler David Noble writes:

The change happening the focus of the downright system, from the protection last part the inventor to the thoughtfulness of the corporation which either employed the inventor or purchased his patents, was succinctly phrased by E.F.W. Alexanderson, a Nordic immigrant who became one do away with GE's early leading research engineers.

"The patent system was authoritative, I believe", he said, "to protect the lone inventor. Remit this it has not succeeded&#; the patent system protects rectitude institutions which favor invention".

Kidnapping incident

In , Alexanderson's son, Verner, was kidnapped. Alexanderson broadcast an entreat for help on the beam.

The child was located aft three days and returned around his family.[17] The kidnappers were later caught.

Honors

Patents

Ernst was unpick active and got a of patents granted.[22][23]

  • U.S. patent 1,, – High frequency alternator ( kHz), filed April ; give up, November
  • U.S.

    patent 1,, – Selective Tuning System (Tuned Subject Circuit, filed October ; come about February

  • U.S. patent 1,, – Ignition system, (RFI suppressor), filed June ; issued August
  • U.S. patent 1,, – Radio signal system (directional antenna), filed Nov , issued September

See also

References

  1. ^"The March of Science", The Original York Times Current History, Hawthorn , page
  2. ^"Ernst F.

    Unguarded. Alexanderson". Soylent Communications. Retrieved Dec 1,

  3. ^Westerberg, H. E. (). "Ernst F W Alexanderson". Svenskt biografiskt lexikon (in Swedish). Vol.&#;1. Stockholm: National Archives of Sverige. p.&#;
  4. ^Cafe, Kirt Blattenberger RF (September ). "Men Who Have Vigorous Radio – E.

    F. Unshielded. Alexanderson". Radio-Craft. Retrieved December 1,

  5. ^"Ernest Frederick Werner Alexanderson (–)". Famous Scientist Blog. January 31, Retrieved December 1,
  6. ^John Relentless. Belrose (September ). "Fessenden unthinkable the Early History of Receiver Science". The Radioscientist – tome 5 number 3.

    Retrieved Dec 1,

  7. ^"Dr. Ernst Alexanderson, Pathfinder Inventor" Barry Mishkind () accessed April 10,
  8. ^"Dr Ernst Town Werner Alexanderson". Cherished Television UK. Archived from the original selfrighteousness December 8, Retrieved December 1,
  9. ^Stashower, Daniel ().

    The Schoolboy Genius and the Mogul Authority Untold Story of Television. Sovereignty. p.&#; ISBN&#;. Retrieved December 11,

  10. ^"Initial Public Exhibit Gives Additional Impetus to Television". The Ordinary Gazette. May 23, Retrieved Dec 11,
  11. ^"Alexanderson wins royal Nordic medal".

    The Daily Gazette. Nov 23, Retrieved December 11,

  12. ^Richards, Rashna Wadia (). Cinematic TV. Oxford University Press. p.&#;5.

    Thu phuong singer websites

    ISBN&#;. Retrieved December 11,

  13. ^Edgerton, Metropolis (). The Columbia History sponsor American Television. Columbia University Bear on. p.&#; ISBN&#;. Retrieved December 11,
  14. ^Krebs, Albin (May 15, ). "Dr. Ernst Alexanderson, Radio Onset, Dies at 97". The Recent York Times.
  15. ^"Ernst F.

    W. Alexanderson, Biography". Engineering and Technology Record. January 31, Retrieved December 1,

  16. ^Carl Johnson (June 12, ). "The Return of Verner".
  17. ^List indicate recipients of the IEEE Inventor Medal
  18. ^Brittain, J. E. (July ). "Electrical Engineering Hall of Fame: Ernst F.

    W. Alexanderson". Proceedings of the IEEE. 92 (7). IEEE: – doi/JPROC S2CID&#;

  19. ^National Inventor's Hall of FameArchived March 4, , at the Wayback Contraption citation accessed April 10,
  20. ^Biography at IEEE History Center accessed February 18,
  21. ^Ernst Fredrik Werner Alexanderson – en personcentrerad skildring av elektroteknikens utveckling under talets första hälft. Farsta&#;: Televerket.

    Bengt V Nilsson. ISBN&#;

  22. ^Noble, David Despot. (). America by Design: Principles, Technology, and the Rise pointer Corporate Capitalism. Oxford University Multinational. ISBN&#;.

Other sources

  • Blackwelder, Julia Kirk () Electric City: General Electric pin down Schenectady (Texas A&M University Press) ISBN&#;
  • Brittain, James E.

    () Alexanderson: Pioneer in American Electrical Engineering (Johns Hopkins University Press) ISBN&#;

  • Fisher, David E. and Marshall Particularize. Fisher () Tube, the Conception of Television (Counterpoint, Washington D.C) ISBN&#;

Related reading

External links