How to Master the ielts

counterbalance
. A geared­down electric motor rotated the pulley wheel, 
which contained a (Q360) groove to 
grip 
the cable and provide the 
traction
. Following 
the success of the electric elevator, skyscraper buildings began to spring up in the 
major cities. The Woolworths building in New York, constructed in 
1913
, was a 
significant landmark, being the world’s tallest building for 
the next 27 years
. It had 
57 floors and the Otis high­speed electric elevators could reach the top floor in a little 
over one minute.
I
Each elevator used several cables and pulley wheels, though one cable was enough 
to support the weight of the car. (Q359) 
As a further safety feature
, an oil­filled shock 
piston was mounted at the base of the lift shaft to act as a buffer, 
slowing the car 
down at a safe rate
in the unlikely event of 
every cable failing as well as the safety brake.

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READING SECTION ExPANDED ANSWERS
223
Q348 FALSE. Only people could be hoisted with a windlass
. The statement 
is false because ‘It was possible to lift heavy weights with a 
windlass
…. 
Materials and people were hoisted in this fashion.
’
Q349 TRUE.
Tall commercial buildings were not economic without an 
elevator
. The statement is true because ‘
Without an elevator, the height of 
a commercial building was limited by the number of steps people could
be expected to climb within an economic time period
.’
Q350 TRUE.
Otis’ pattern documents contained a diagram. 
The statement is 
true because
 
‘The operating principle of the safety elevator was described 
and 
illustrated
in its pattern documentation.’