3. Name the three types of time measuring devices used in earlier times.
Answers
Answer:
sun clock ,water clock and sundails
Answer:
There are about the three types of time measuring devices used in earlier time :
1. Hourglass
An hourglass ( sandglass , sand timer , sand clock , egg timer ) measures the passage of a few minutes or an hour of time. It has two connected vertical glass bulbs allowing a regulated trickle of material from the top to the bottom. Once the top bulb is empty, it can be inverted to begin timing again. The name hourglass comes from historically common hour timing.
2. Clepsydra
A water clock or clepsydra is a timepiece in which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel where the amount is then measured. Water clocks, along with sundials, are likely to be the oldest time-measuring instruments, with the only exceptions being the vertical gnomon and the day-counting tally stick.
3. Candle clock
A candle clock is a thin candle with consistently spaced markings (usually with numbers), that when burned, indicate the passage of periods of time. While no longer used today, candle clocks provided an effective way to tell time indoors, at night, or on a cloudy day. A candle clock could be easily transformed into a timer by sticking a heavy nail into the candle at the mark indicating the desired interval. When the wax surrounding the nail melts, the nal clatters onto a plate below. It is unknown where and when candle clocks were first used.