He moved back to London in 1857 to sell his invention and was committed to transmitting sound through wires. He is committed to the development of microphones and induction balances （ which was later used in metal detectors ）. Although Hughes was an experimenter, he had little mathematical training. He is a friend of William Henry Price. Printed Telegraph Hughes Telegram is the first telegram to print text on paper; the product was manufactured by German Siemens and Halske （ Warsaw Muzeum Techniki） In 1855, Hughes designed a printed telegraph system.
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[6] In less than two years, many small new database telegraph companies, including Western Union remittances at an early stage of development, jointly established a large company —— Western Union Telegraph Company, which was launched on the Hughes system Telegraph business. In Europe, the Hughes telegraph system has become an international standard. Microphone Hughes carbon microphone. （The ） vertical carbon rod （A） is placed on the carbon block with its tip hanging （ under ）. Sensitivity can be regulated by the spring （S）1878.
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Hughes published a book about the impact of sound on the electric electronic sound collector （ called “ launcher”）, which was developed for the phone. [6] He showed that the resistance change of the carbon telephone transmitter is the result of the interaction between carbon components, rather than the generally accepted resistance BRB Directory change is the result of the compression of carbon itself. [7]Based on its ability to pick up extremely weak sounds, Hughes called it “ microphone effect ”（ using Charles Wheatstone’s word [8]） created for mechanical sound amplifiers in 1827>>.