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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(C) 1988-1994 Tim Hunkin. All rights reserved. |