Clocks through time (1)

Clocks through time (1)

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It was probably around 3000 years ago that people first began making things to help them measure the passage of time. Having observed that shadows move around trees as the sun passed overhead, he marked even divisions on the circle as the shadow of the stick crossed it. Wholesale replica designer handbags, en people could tell which part of the day it was by noticing which mark on the circle the shadow fell across. These circles were called “sundials”. Later, they were made of stone and metal to last longer.
Of course, a sundial did not work at night or on cloudy days, so men kept inventing other ways to keep track of time. One invention was a striped candle. Each stripe took the same amount of time to melt. If each strep melted in about an hour, wholesale coach handbags, about three hours old have passed when three stripes melted.
A water clock was another way to tell time. A container had a line with a number beside it for every hour. It also had a tiny hole in the bottom. The container was filled with water that dripped through the hole. When the water level reached the first line, people know that an hour had passed. Each time the water level fell to another line, one more hour had passed.
Candles and water clocks helped people know how much time had gone by. But candles had to be remade, wholesale designer handbags and water clocks had to be refilled. So, after glass blowing was invented, the hourglass came into use. Glass bulbs were joined by a narrow tunnel of glass, and fine, dry sand was placed in the top bulb. The hourglass was easy to use, but it had to be turned over every hour so the sand could flow again.

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