Αποστολή από: Alexandros00 στις Ιούλιος 13, 2021, 22:14:14 μμ
Ρολόγια από κερί με ενσωματωμένο ξυπνητήρι..
Μια αρχαία ιδέα
The candle clock is an ancient technology. The first recorded reference was in 520 CE in a Chinese poem by You Jiangu. He described six uniform candles of equal weight and thickness—each 12 inches tall. The candles were marked in sections of one inch. Each inch took 20 minutes to burn and an entire candle lasted 4 hours. Enclosed in structures to protect the flame, the candles could be used to gauge the passage of time—a technique perfect for when the sun was not visible.
Other early references to candle clocks exist in Japan during the first millennium CE. Thousands of miles away, King Alfred the Great of England was also thought to use this method in English churches. A candle of any size could be used, so long as the time to burn down was established and regular. Through markings, candles could be subdivided for more incremental measurements of the passing of time.
The candle clock—cleverly marked candles which indicated time as the wax burned down—was an important way to tell time or even set alarms in the days before electricity.
The invention of the marine chronometers in the 18th century changed the face of navigation, but it was also an important moment in the history of clocks and telling time. Generally attributed to English clockmaker John Harrison, the “sea watch” was surprisingly accurate and enabled sailors to avoid miscalculating their courses (which often ended in wrecks). From candle clocks to marine chronometers, mankind has been inventing creative solutions to the problem of telling time for thousands of years.
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Αποστολή από: Thodorisklm στις Ιούλιος 14, 2021, 16:03:55 μμ
Να προσθέσω ότι ως ξυπνητήρι χρησιμοποίησαν κεριά με καρφιά . Όταν έλιωνε στο σημείο που ήταν το καρφί, έπεφτε και από το θόρυβο ξυπνούσαν. Έβαζαν πολλά καρφιά ,κάτι σαν …Snooze
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