LEGO Big Ben - Page 45

8x
48
‘DoubleThree-legged
GravityEscapement’was
thenameofanewand
revolutionarymechanism
ensuringtheclock’s
accuracybymakingsureits
pendulumwasunaff ected
byexternalfactorssuch
aswindpressureonthe
clock’shands
© parliament.uk
45
21013_BI_IN.indd 45 20/01/12 12.24