Click to edit Master text styles
Second level
Third level
Fourth level
Fifth level
Alexander Graham Bell (Scottish, moved to America - Boston)
b. 1847 Edinburgh
Interested in communication with deaf
Mother & Mabel Hubbard
Tom Watson
http://en.wikipedia.org/wiki/Alexander_Graham_Bell
http://bnrg.eecs.berkeley.edu/~randy/Courses/CS39C.S97/telephone/telephone.html
1877 Invented phonograph recoding on wax cylinders
1877 Hired by Western Union to counter Bell
 -- Comes up with carbon granule microphone
1879 First public demonstration of incandescent light bulb
Strowger undertaker in Kansas
1889 invented switch – didn’t like phone operators
U.S. Patent 0447918
http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=0447918
http://en.wikipedia.org/wiki/Almon_Strowger
Edison Effect –
soot particles from early lightbulbs blackened glass
tried putting electrode in bulb to attract particles
noticed that current flowed if wire was +ve wrt filament
didn’t follow up – patented as electrical indicator
John Fleming
http://en.wikipedia.org/wiki/John_Ambrose_Fleming
US Patent 879532
2004 3bn subscribers