Quest Hourglass Timer, how to use hourglass timer?

First of all, the 5-minute and 7-minute hourglasses leak at the same time, and when the 5-minute hourglass is finished, there are still 2 minutes of sand left in the 7-minute hourglass, so immediately let the 5-minute hourglass leak again. When the remainder of the 7-minute hourglass is gone, there are 3 minutes of sand left in the 5-minute hourglass, so immediately let the 7-minute hourglass leak again, and when the remaining part of the 5-minute hourglass is gone, there are exactly 4 minutes left in the 7-minute hourglass.

Two hourglasses are filled with sand at the same time, and then the sand is drained into the seven-minute hourglass with a five-minute hourglass, and when the sand in the five-minute hourglass is gone, the sand in the seven-minute hourglass can leak for two minutes. At the same time, fill the five-minute hourglass and drain the sand into the seven-minute hourglass (the five-minute hourglass is two consecutive times), and when the five-minute hourglass is drained for the second time, there will be 4 minutes of sand in the seven-minute hourglass, and then the time can be calculated.

1 2 streams at the same time, then = 5 minutes of streaming, then 7 minutes and 2 minutes of sand and then then = 7 minutes of flow and doing it all over again.

It is purely personal and cannot be copied.

7-5) 2=4, which is four minutes. But I guess the topic won't be that simple.

Can the hourglass timer add sand a second time? Is it possible?

First numbered: 4-minute hourglass is No. 1, 7-minute hourglass is No. 2.

Step 1: At the same time, the two hourglasses of No. 1 and No. 2 are being timed, and after 4 minutes, the No. 1 hourglass is leaked, at this time, the No. 1 is reversed, and after another 3 minutes, the Douye No. 2 hourglass is leaked. (At this time, there is 1 minute left on the 1st) duration: 4+3=7 minutes.

Step 2: The No. 2 hourglass is reversed, until the No. 1 hourglass is finished, and the No. 2 hourglass has been reversed for one minute. Duration: 1 minute.

Step 3: Put the No. 2 hourglass forward again, and wait until the hourglass that has just been erected by Liuzen flows back, exactly 1 minute. Duration: 1 minute.

Total time: 7 + 1 + 1 = 9 minutes.

The principle of the hourglass timer is much the same as that of the leakage tick, which measures time based on the amount of quicksand leaking from one container to another.

Introduction to the hourglass

The hourglass, also known as the sand clock, is a device for measuring time. The Western hourglass consists of two glass balls and a narrow connecting pipe. Time is measured by the time it takes for a glass ball filled with sand to flow from the top through a collapsed narrow pipe to the bottom of the glass ball.

The earliest hourglass found in the west of the shed bend circle was about 1100 A.D., which was later than the hourglass in China. China also has sundials, missing engravings and other timers, but because sundials can only be used in daytime and sunny days, and this method of using quicksand instead of water is because the air in northern China is cold in winter, and the water is easy to freeze.

1. Find two beverage bottles of the same height, remove the two caps, drill 3 small holes in the same direction on the two caps, fix the two caps together with screws, and then drill a larger hole in the middle of the two caps as a leakage cover hole.

2. Go to the construction site to load two bottles of clean fine sand and come back, dry it for later use.

3. Find a screen mesh, make a small sieve, sift out the coarse sand, leaving fine sand, if the sand is not fine enough, put two or three layers of sand mesh on the sieve, and then sift a weave to leave finer sand.

4. Fill one of the bottles with the fine sand sieved out, then close the connected caps tightly, and then fill the empty bottles as well. The simple hourglass timer is ready (fixing the two caps with screws is better than using glue, it's very strong, I've tried it).

5. Turn the bottle upside down and judge it, so that the bottle full of sand is on it, and you can see the fine sand leaking from the hole in the middle of the bottle cap to the bottle below.

Once the hourglass timer is ready, it's time to use it to measure the time. When the hourglass timer is turned upside down, it takes a few minutes to see that all the sand leaks into the bottle below, and during the timekeeping process, mark the position of the sand leaking every minute with an oil-based pen, and then you will know how long it has been when you see the sand at this position. My hourglass timer, it takes 8 minutes to leak a small bottle of fine sand, and the sand inside is not fine enough, if it is fine, it may take more than 10 minutes to leak out!

Find two identical beverage bottles, remove the caps, drill 2 small holes in the leakage direction of the two caps, fix the back and back of the two caps together with screws, and then drill a hole in the middle of the two caps that is larger than the roll as a sand leak. It's good to change it like this. In this way, time can be measured.