The meaning of sending an hourglass symbolizes love, friendship and happiness. This means that we should be happy forever and cherish love and friendship forever! Times have changed, things have changed, years have passed, and memories have disappeared. When thoughts are gone, memories are extravagant, and forgotten time will only be sealed in the bottom of my heart.
The hourglass represents the passage of time and should be cherished. There may be no difference in color; Second, it can also represent feelings and send an hourglass to express a farewell feeling. The process of falling into the sand is also the process of recalling the beautiful fragments between friends.
Sending an hourglass expresses a feeling of farewell, and the process of sand falling is also a process of remembering beautiful fragments between friends. The sand in the hourglass is a good memory between friends.
Boys send girls an hourglass: Wait, cherish time and don't waste your youth. The hourglass for girls to send their favorite boys is: Time flies, youth is short, I hope you cherish yourself.
Different colors of hourglass represent: white represents health; Purple represents taste; Pink represents innocence; Blue represents vitality.
White hourglass: the gift of growing up, giving you love and touch.
Blue hourglass: the vitality of life, the feeling of parting.
Purple hourglass: noble love, flowing water, accompanied by life.
Yellow hourglass: It represents purity and friendship. I hope time goes by and keep purity and friendship in my heart.
Pink hourglass: it represents innocence.
The historical hourglass The hourglass is said to have been invented by Alexander in the third century. They sometimes carry it with them, just like the watches people carry today. Speculation was invented as an instrument for sailing at night at the same time as the compass appeared in the 12 century (during the day, sailors can estimate the time according to the height of the sun). The irrefutable discovery dates back to14th century. The earliest hourglass is a written record of Humblot Renzetti's fable, 1338, a suitable government mural. At the same time, the hourglass is mentioned, which appears in the list of ship shops. The earliest existing record is a British ship? Shangri-la George? 1345 Sales receipt of Thomas Stetesham, the clerk of the website.
Since15th century, they have been widely used in sea, church, industry and cooking. During Magellan's voyage around the world, each of his ships kept the hourglass time of 18. In the paper work on the ship, running the hourglass provides time for the log on the ship.
Before the Jesuits entered Chinese mainland, foreign businessmen and missionaries living in Macau had brought medieval European clocks and watches to Macau. Jesuit Luo Mingjian (Michael Lovgil, 1543 ~ 1607) and Matteo Ricci (1552 ~ 16 10) are in158/kloc respectively. The hourglass, water clock (that is, water sundial) and selfie stick driven by heavy hammer widely used in Europe were introduced into China at the same time. After the hourglass was introduced to China, it was used as a timer in navigation. In the twenty-third year of Qianlong (1758), Huang Zhou wrote A Brief Introduction to Ryukyu Kingdom, which was about the voyage from Fuzhou to Ryukyu. More than six miles? And hourglass timing, one of every two leaks is zero? .
China invented a similar thing in ancient times called? Missing? , also known as clepsydra.
The earliest records of lost prints can be found in Zhou Li. The oldest unearthed leak is a relic of the Western Han Dynasty, with 3 pieces, which were found in Mancheng, Hebei, Yikezhaomeng, Inner Mongolia and Xingping, Shaanxi respectively. There are two relatively complete leaks handed down from generation to generation, both of which are connected with water. Beijing Museum of Chinese History was built in the third year of Yuan Dynasty (13 16). The one hidden in the Palace Museum in Beijing was made in the Qing Dynasty.
The influential hourglass records in the ancient history of China can be found in the five hourglasses created by Zhan Xiyuan, a great calligrapher in Yuan Dynasty, from 65438 to 0360. Zhan Xiyuan thinks that it seems too simple to let the quicksand flow between two sand buckets. The five-wheel hourglass he created added a mechanical gear set, which was driven by the power of quicksand. Such an hourglass is equipped with a time dial engraved with the time of day, which is equivalent to the clock face of today's clocks. There is a pointer in the center of the time disk, which is driven by the shaft of the last gear. The rotation of the gear makes the pointer indicate the time on the time disk. Zhan Xiyuan also skillfully added a set of mechanical transmission device to the middle wheel, so that the two Xiao Mu images on the five-wheel hourglass can be rotated every hour to beat the drums to tell the time.
We can see that the structure principle of Zhan Xiyuan's five-wheel hourglass chronograph is almost the same as that of modern clocks. However, Zhan Xiyuan was born at an inopportune time. Eight years after the advent of this advanced timer, the Yuan Dynasty perished, and Zhu Yuanzhang, the Ming emperor, was also busy with the power struggle and could not support the development of folk science and technology. This laid the groundwork for China's timer to fall behind the west later.
The convenience of hourglass is that the upper and lower sand barrels can be used upside down. The hourglass also has some shortcomings that are difficult to solve, and the sand is easy to block when flowing. However, the sand used in ancient western hourglasses has a secret recipe to solve this shortcoming: they first boiled marble powder in wine for nine times, skimmed the floating foam, dried it and then used it, so as not to block the hourglass. But the accuracy of hourglass timing is worse than that of drip, so it is not as common as drip. In addition, the hourglass needs a glass container to observe the amount of sand. Most hourglasses in China are made of pottery, so it is impossible to see the amount of sand. This may be one of the reasons why hourglasses are not as popular in China as in western countries.
Introduction to the hourglass The earliest hourglass discovered in the west is about 1 100, which is later than that in China. China's hourglass is also an ancient timekeeping instrument. The principle of making hourglass is basically the same as that of leaky carving. It measures time according to the time when quicksand leaks from one container to another. This method of replacing water with quicksand is because the air in northern China is cold in winter and water is easy to freeze.
The most famous hourglass was created by Jan Xiyuan in 1360? Five hourglasses? . The quicksand flows from the funnel-shaped sand pool to the sand bucket at the edge of the primary wheel to drive the primary wheel, thus driving the mechanical gears at all levels to rotate. The last gear drives the intermediate wheel that rotates on the horizontal plane. There is a pointer on the shaft of the intermediate wheel, which rotates on the dashboard engraved with lines to display the time. This display mode is almost identical to the surface structure of modern clocks and watches. In addition, Zhan Xiyuan skillfully added a mechanical toggle device on the middle wheel to remind the two Woodenhead standing on the five-wheel hourglass to beat the drums to tell the time. Every hour or a moment, two Woodenhead will come out and beat the drums to tell the time. This hourglass is separated from the auxiliary astronomical instrument and becomes a mechanical clock structure independently. Because there is no water pressure limit, hourglass is more accurate than leaky carving.
The influencing factors of hourglass The influencing factors of time hourglass include: the number of fillers, the bending shape of the inner wall of glass ball (the timing length of upright and inverted hourglass is slightly different), the width of neck tube, the type and quality of fillers. The earliest hourglass used ancient tomb marble grinding powder, iron filings and eggshell powder. Modern hourglasses usually use artificial glass beads. According to the specification document of German hourglass manufacturer KOCH, the error of 30-minute hourglass can be controlled within 1 minute, and the error of 1 hour hourglass is about 5 minutes. Note: it is not a timing instrument, and can be compared with the accuracy of modern timing instruments.
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