Steam clock Vancouver

One of only six functioning 'steam clocks' in the world and possibly the second ever created, Gastown Steam Clock was the 1977 invention of horologist and steam clock pioneer Raymond Saunders.
It is located on the corner of Water and Cambie Streets in the historic Gastown district of Vancouver.
Steam clocks are clocks partially powered by a steam engine. In the case of Gastown's this originally meant the clock was powered by Vancouver's distributed steam heating system.
Steam shot through a vent in the street below and into the clock, driving a series of chains and balls that ultimately turned the clock hands.
Today the hands are powered by an electric motor, the steam mechanism having proven too inaccurate.
Despite this, the clock earns its name through puffs of steam that whistle from its top every hour, and from the original steam engine that can still be seen inside through glass panels.