The mechanism is a marvel of Victorian engineering. Each of the two bascules weighs over 1,000 tonnes—roughly the weight of a dozen fully loaded London double-decker buses.
The lifting process is made efficient by massive counterweights located at the base of each bascule. These counterweights drop as the roadways rise, minimising the power required. It takes approximately 75 seconds for the bridge to open completely, and the full cycle takes about 2 minutes and 30 seconds.



