Oil-lamp Clock
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Oil-lamp Clock
18th Century oil-lamp clock

Oil-lamp clocks are clocks consisting of a graduated glass reservoir to hold oil - usually whale oil, which burned cleanly and evenly - supplying the fuel for a built-in lamp. As the level in the reservoir dropped, it provided a rough measure of the passage of time.

The principle behind such a time-keeping device is that it measure a quantity that either decreases or increases at a constant rate. Lamps or candles, burning fuel at a steady pace, fit this category, and as a bonus produce useful light. Hourglasses depend on the steady draining of fine sand through a small aperture. Water clocks or clepsydra measure a gain or loss of water by using drops of uniform size and frequency. The Persian fenjaan made use of the constant time it took for the sinking of a floating bowl with a hole in its underside.

It is unknown when, where or in which way the oil-lamp clocks were first introduced. this clock was but mainly used in the mid of 18th century

See also


  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.



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