Pneumatic clock

To dispense with winding clocks, a source of malfunction, Charles Bourdon devised an ingenious mechanism powered by a ‘hydro-pneumatic’ motor. The flow of water in a pipe and a delicate balance between vacuum and atmospheric pressure enabled the regular working of the clock’s mechanism. The clock’s water tank had to be filled regularly, but if it was connected to a water conveyance network, the clock could work continuously without ever being wound. Despite its complex mechanics, the apparatus proved to be reliable. It could be used to work several clocks simultaneously and provide the time for private clients or companies paying a subscription. This invention was awarded a silver medal at the Universal Exposition in 1878.