The Secret Life of the Telephone

The forerunner of the telephone was the telegraph. By 1870 all major towns in Europe and America had telegraphs, sending messages in 'on' and 'off' pulses (e.g. Morse code). It was while trying to improve the telegraph that Bell discovered the telephone.

SERIES 1:  vacuum cleaner sewing machine central heating system washing machine refrigerator television 

SERIES 2:  car internal combustion engine quartz watch   telephone radio set video recorder  

SERIES 3: fax machine lift word processor electric light photocopier the office

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