[PAR] [TLE] John Ambrose Fleming [SEP] Sir John Ambrose Fleming FRS (29 November 1849 – 18 April 1945) was a British electrical engineer and physicist.  He is known for inventing the first thermionic valve or vacuum tube.  He is also famous for the left hand rule (for electric motors).  He was born the eldest of seven children of James Fleming DD (died 1879), a Congregational minister, and his wife, Mary Ann, at Lancaster, Lancashire and baptised on 11 February 1850. [PAR] [TLE] Fleming's left-hand rule for motors [SEP] Fleming's left-hand rule for motors is one of a pair of visual mnemonics, the other being Fleming's right-hand rule (for generators).  They were postulated by John Ambrose Fleming, in the late 19th century, as a simple way of working out the direction of motion in an electric motor, or the direction of electric current in an electric generator.
[PAR] [TLE] John Ambrose Fleming [ SEP ] Sir John Ambrose Fleming FRS ( 29 November 1849 – 18 April 1945 ) was a British electrical engineer and physicist . He is known for inventing the first thermionic valve or vacuum tube . He is also famous for the left hand rule ( for electric motors ) . He was born the eldest of seven children of James Fleming DD ( died 1879 ) , a Congregational minister , and his wife , Mary Ann , at Lancaster , Lancashire and baptised on 11 February 1850 . [PAR] [TLE] Fleming 's left - hand rule for motors [ SEP ] Fleming 's left - hand rule for motors is one of a pair of visual mnemonics , the other being Fleming 's right - hand rule ( for generators ) . They were postulated by John Ambrose Fleming , in the late 19th century , as a simple way of working out the direction of motion in an electric motor , or the direction of electric current in an electric generator .
The inventor of the first thermionic valve made what visual mnemonic tool for generators?
The inventor of the first thermionic valve made what visual mnemonic tool for generators ?
Fleming's right-hand rule
Fleming's right-hand rule