Beverly Clock

The clock's mechanism is driven by variations in atmospheric pressure, and by daily temperature variations; of the two, temperature variations are more important. Either causes the air in a one cubic-foot (28 litre) air-tight box to expand or contract, which pushes on a diaphragm. A temperature variation of six degrees Fahrenheit (3.3 K) over the course of each day creates approximately enough pressure to raise a one-pound weight by one inch (equivalent to 0.113 Joules or 31 μWh), which drives the clock mechanism.

A similar mechanism in a commercially available clock which operates on the same principle is the Atmos clock, which is manufactured by the Swiss watchmaker Jaeger-LeCoultre.

While the clock has not been wound since it was made by Arthur Beverly in 1864, it has stopped on a number of occasions, such as when its mechanism needed cleaning or there was a mechanical failure, and when the Physics Department moved to new quarters. As well, on occasions when the ambient temperature has not fluctuated sufficiently to absorb the requisite amount of energy, the clock will not function. However, after environmental parameters readjust, the clock begins operating again.

• Long-term experiment
• Oxford Electric Bell (1840)
• Pitch drop experiment (1927)
• Cox's timepiece
• Clock of the Long Now
• Temperature gradient ocean glider

Citations

General