penicillin John Ambrose Fleming , (1848-1945), England — vacuum diode Sandford Fleming , (1827-1915), Canada — Universal Standard Time Tommy Flowers , (1905-1998), England — Colossus an early electronic computer. Jean Bernard Léon Foucault , (1819-1868), France — Foucault pendulum , gyroscope , eddy current Benoît Fourneyron , (1802-1867), France —