 After graduation in 1899 he joined the Marconi Company where he spent his entire professional career.He was first sent to South Africa to provide equipment for the Boer War, then spent 2 years in Russia.After his return to the UK, he invented a number of important radio devices including the variable capacitor (patented 1902), ganged tuning (1907), variable coupling (1907), coaxial cable, and the Franklin oscillator.