The Secret Life of Central Heating
At first Roman houses simply had a fire in the middle of the room (the Latin for hearth is focus). But they probably had trouble with smoke as the Latin for living room is atrium (from ater meaning black). By about 400AD the Romans had perfected a form of central heating. The fire was lit outside in a furnace with hot air ducts under the floors and in the walls.
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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