This question should be said to be less rigorous. The two concepts of the ancients and the large cylinder are too big, anyway, after the Ming Dynasty, basically you can see the diameter of nearly 2 meters of the large cylinder can be fired.
Now it is not common to use large-caliber cylinders, because they are no longer practical. In the past, the cylinder was valuable and easy to break, so ordinary people could not afford to use it. Even if it is broken, I am reluctant to throw it away, find a curium maker to curium up, and use it as usual.
The clay cylinder is afraid to shoot, but when they see the cylinder, people like to go up and shoot it and listen to the metallic echo. Therefore, in the past, the rural areas were afraid of tank breaking, usually buried half of it in the ground, so that it was stable, storing water and storing grain, there was no problem.
And this has an advantage, the larger the caliber of the cylinder before, the more likely the cylinder body is to deflate, the easier it is not round, affecting the appearance. This may be disposed of as a defective product in a rich family, but the average person will use it as a treasure, so we have the opportunity to see why the original cylinder should not be too large.
The cylinder body is not deflated before firing, but because the cylinder wall is thin, the cylinder mouth is thick, in the process of firing, because of the stress, the defective rate is too high, so the ancients can not afford luxury.
Before the Ming Dynasty, that is, before the popularity of large-caliber cylinders, the most popular was the urn. The physical design of the urn is actually more reasonable than the cylinder, because "the open is the cylinder, and the closing is the urn". Because the urn reaches the mouth and begins to tighten in, the pressure on the urn wall will be much less.
The appearance of large-caliber cylinders late does not mean that they just appeared late, in fact, the cylinders appeared very early, basically in the late Neolithic period, when there was a clay culture, there were already tanks, such as the stork stone axe pottery jar unearthed in Linru, Henan. The word cylinder also appeared very early, and it was clearly recorded in the "Chronicle of History and Cargo Colonization".
The reason why there was a debate about whether there was a large-caliber cylinder before the Song Dynasty was related to Ma Ye's question about "Sima Guang smashing the cylinder".
It is clear that "Sima Guang smashing the cylinder" is a literary language, the purpose is to rhyme. Because what is clearly recorded in the "History of Song" is "Sima Guang smashing the urn".
The children played in the court, and one of them climbed the urn, and the foot fell into the water, and all the people abandoned, and the light held the stone to break the urn, and the water burst, and the child had to live.
In fact, this also explains why after the child falls in, he does not lie out of the cylinder mouth, but smashes the cylinder. After all, the cylinder is open, and the cylinder mouth is the most open place of the cylinder body, theoretically more convenient to climb out, children fall into the cylinder, the water has buoyancy, it is easy to grab the cylinder mouth, basically unlikely to cause life danger.
But the urn is convenient to understand, because the urn mouth is closed, the child falls into it, it is really dangerous, because of the nervous fear that the urn mouth is so small, it is easy to get in, it is difficult to get out. In addition, there is water in the urn, and it must be immediately broken and smashed through the wall of the urn to be rescued.
Therefore, "Sima Guang smashed the cylinder" is definitely wrong. But would the Song Dynasty have a large-caliber cylinder? Ma Ye also said that at least no large-caliber cylinder cultural relics were found before the Song Dynasty.
Original debut, welcome to pay attention or spit