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For young children, the concept of time is very vague. They don't know exactly how long a minute, ten minutes, or an hour really is. Brother Huan also often receives messages from parents and mothers: Children have no concept of time, how to break? If you want your child to correctly understand the length of time, time relationship, etc., you need certain life experience and certain cognitive ability.
Today, follow the brother to make a water clock, which can be used to time, and can also let the child have a preliminary understanding of the length of time!
Two equal-sized plastic bottles, tape, markers, pushpins, utility knives, water, funnels, timers, water bottles.
1, with an art knife from the bottle 1/3 cut off the top, cut the top can be garbage recycling, the back does not need this part.
Tips: For easy recording of experimental steps, we can mark bottles (bottle a is the complete bottle, bottle b is the cut bottle).
2. Flip the bottle a over and then use a pushpin through the center of the bottom of the bottle to form a small hole.
Tip: This step needs to be done with Mom and Dad, who can also help punch holes.
3. Put the bottom of bottle a on top of bottle b. Attach a note to the bottle body of bottle b, the distance from the bottom of bottle b to the bottom of bottle a or slightly below the bottom of bottle a.
4. Now have the timer and kettle ready. Pour water into the neck of bottle a with a funnel (bottle should be nested) and start the timer immediately. Pour on the filling line of bottle a.
5. When a minute has passed, use a marker to make a small mark at the watermark on the note on the b-bottle. Continue marking for a few minutes until the water completely drains the bottom bottle from the top bottle. We only mark the first 10 minutes, but you can mark as many minutes as you want.
Now the babies can pour out the water and use your water clock to calculate the time! See how accurate your water clock is, and how much time difference there is with the timer.
Cortesibius, inventor of Alexandria, was at his peak from 275 BC to 260 BC and served the Ptolemaic dynasty. He is interested in aerodynamics and various mechanical devices. Inventions include: torsional ballistas, water organs, the earliest precision water clocks, pressure pumps with vapor deficiencies and pistons to generate power, and small toys with exquisite workmanship.
Water bells were also first used to record the time of a speaker's speech.
There were no clocks and watches in ancient China, and the ancients timed one by life experience and the other by various tools.
The earliest tools were the gui table and the sundial, which used the length and direction of the sun's projection to determine time, respectively. The Gui table is mainly used to measure the time of day, determine the four seasons and identify the orientation. Sundials are mainly used to measure time, and the gui watch and sundial are collectively known as solar clocks.
Later, there were leaking engravings, incense seal bells, Daming lamp leaks, five-wheel hourglasses, water transport instrument elephant tables and so on.
sundial
Gui table
Five hourglasses
Water transport instrument elephant table
So how did the ancients use a leaky pot to drip water to keep time?
When they use it, they first pour water into the day and day pot, and the water will drip through the faucet under the pot to the "night day kettle", "flat kettle", and "receiving kettle" below, and the receiving kettle is equipped with a "floating arrow" made of wood, and the lid of the pot is inserted with a copper ruler engraved with a 12-hour scale. The ancients knew the specific time from the corresponding scale on the copper ruler.
According to the "Continuation of Panyu County", the person who manages the dripping of the copper pot is called "Si Hu Official", and the "Si Hu Official" in addition to hanging the time card around the city tower on time and telling the people the time, is also responsible for adding water to the leaky pot to ensure the accuracy of the time. It is said that the error of the copper pot dripping is about 10 minutes a day.
You can also try diy other ancient timers at home Oh, the method of making sundials can refer to the "Steam Hands-on Exploration Series" science volume 67 pages.
Handykid focuses on children's art and technology enlightenment, introduces children's favorite fun science experiments, science and technology diy projects, etc., and usually recommends some classic books and documentaries.
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