To see microorganisms in water, you need a microscope with a magnification of at least 200 times. The first such observation was made by Leeuwenhoek using a monolithic microscope he had made himself.
After seeing the hideous appearance of lice, Zhang Yitai developed an extraordinary interest in microscopes. He was quite intelligent and after studying the optical principles in books, he also began to grind his own lenses.
The Academy of Sciences not only has students who are crazy about learning, but also blacksmiths, carpenters, jewelers, etc., who are dedicated to making practical things for these clumsy guys.
Jewelers have the tools and related techniques to grind gemstones.
After watching the jeweler work for a few days, Zhang Yita was not satisfied with the lenses he had polished, so he started to do it himself.
Today's microscope was completed by Zhang Yitai after working day and night for more than half a month. The simplest compound microscope described in the book finally made him realize the existence of another world.
Xu Fuyuan took the microscope and observed the water droplets on the glass.
Zhang Yita was still not satisfied, and excitedly described to the people who entered the room, "There are many tiny living creatures in the water. They are alive, beautiful, and can move. Some are like spears shooting straight through the water, some are spinning like spinning tops, and some are nimbly wandering around in groups..."
"Just a drop of water?" someone asked. "Then wouldn't we be drinking countless tiny creatures every day?"
"If you don't believe me, come and see!" Zhang Yita looked down on this man and said with his eyes rolled up, "So what if he drank it? We've been doing just fine for so many years.
Xu Fuyuan held the microscope and exclaimed in surprise, "It is indeed true. I never dreamed that there is a world that cannot be seen by the naked eye."
Everyone was skeptical and went forward to observe one by one. Their performance was similar to Xu Fuyuan's, shocked and hard to believe.
Zhang Yitai curled his lips and rolled his eyes, thinking these guys were country bumpkins making a fuss out of nothing. In fact, this was also the first time he saw it, but he only knew about it from reading, and he also found it hard to believe.
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