"Ink skill!" everyone took a deep breath.


    This is the strength of ink technology. The emergence of a new ink technology directly brought earth shaking changes to Datang and had a great impact on the whole industry.


    Nowadays, it is not only the Tang Dynasty that protects the Mohist school, but the Mohist school is pushing the Tang Dynasty forward. It is not the people of Chang''an City who try their best to enter the ink technology exhibition to see the excitement, but if they miss the ink technology exhibition, they may lose their first opportunity and be defeated.


    On the contrary, if I can seize the opportunity in the ink technology exhibition, I will be able to make a lot of money. For a moment, the sharp people present have seen too many business opportunities.


    Acting as a pesticide sprayer, this is a must for farmers. If you master the grafting technology and grow fruits and vegetables, you can sit under the tree every year. If you get involved in the wharf station business and use Mohist machinery, you will be able to save manpower, greatly improve the efficiency and take pride in your peers.


    Step by step, step by step, the ink technology exhibition has given people too many surprises.


    "Mechanics is the core of Mohism. In addition, optics also gives Mo a great surprise." Merton reached out and put a pair of glasses on his eyes.


    "Myopia!"


    "Reading glasses!"


    The crowd shouted in the stands.


    "Oh! It seems that everyone already knows!" Merton said helplessly.


    The crowd suddenly chuckled.


    "Then I''ll tell you something you don''t know. As we all know, presbyopic glasses can enable the elderly to regain their eyesight. I don''t know that presbyopic glasses have another wonderful use in addition," Merton said.


    Many people were immediately curious. The price of reading glasses was not high. Now most of the elderly in Chang''an City have been equipped with a pair. Many old people present wore reading glasses.


    "This is just a small ink technique for everyone''s enjoyment. You can pick up your reading glasses, face the sun, and put the back of your hand behind you." Merton said.


    "Oh!"


    At present, many old people are childlike and follow Merton''s instructions.


    In the box, the slanting sunlight just came in. Li Shimin looked at the ground with a magnifying glass specially prepared by Merton. He saw an unusually bright light spot on the ground.


    "Ah! It hurts!"


    Pound suddenly exclaimed, quickly put down his reading glasses and blew on the back of his hand.


    "You old bastard, but you fell into Merton''s plan!" Li Shimin laughed.


    Pound suddenly burst of Hao Ran: "the old minister didn''t check for a moment. Who could have thought that this light spot was so hot."


    At the moment, many people also find that the temperature rises greatly under the light spot for a long time. If they don''t check it for a while, they suddenly shout pain,


    In the crowd, Quan Wanji, dressed as an ordinary man, covered the back of his hand, looked at Merton with hatred and said, "great treachery, disrespect for the old."


    "What''s the matter? It''s just a harmless joke!" an old man nearby looked at Quan Wanji unhappily. In his opinion, it''s nothing, but very fun. After talking, he picked up his reading glasses and looked at the bright light spot curiously.


    Merton chuckled: "I believe you have learned the wonderful use of reading glasses. You feel hot after only taking photos for a short time. What if it''s exposure for a long time?"


    Merton picked up a magnifying glass of the same type as Li Shimin and irradiated a brazier with soft straw five steps away. Within a while, wisps of green smoke came out of the brazier, and then a flame came up and quickly ignited the whole brazier.


    "Ignition in the air!"


    "Magic!"


    The crowd looked at the flames and exclaimed.


    Merton used only a magnifying glass to ignite objects in full view of the public.


    In the box, Li Shimin stared at the flames from the brazier in front of him. Merton also left a set of the same tools for him in the box. If Li Shimin didn''t light the flame himself according to Merton''s steps, I''m afraid he would shout magic.


    "What''s going on?" Quan Wanji touched the reading glasses on his eyes and was shocked. He couldn''t understand that the glasses he often wore had such a function.


    "Is it that light spot?" weisi''an wondered.


    Quan Wan Gideon suddenly.


    "Yes, it is that light spot that ignites the flame. Light is a common thing for people. It is right around us. Light can bring temperature to the earth, let our eyes see things clearly, and make plants grow rapidly." Merton said emotionally.


    The people in the stands nodded slowly. The role of light is too great, but it has never been ignored.


    "Mohists have been studying the way of light and shadow. In the first ink technology exhibition, I said that if you fork a fish, you must fork the bottom of the fish. I''m afraid many brothers have tried it, and chopsticks are broken in the water in a bowl. This is the refraction of the sun." Merton asked around.


    "Refraction!" the crowd nodded.


    "The same is true for reading glasses this time, but reading glasses refract the sunlight in the whole lens range to one point. In this way, the temperature of the sunlight increases several times, so that the flame can be ignited." Merton explained the principles one by one, and the people suddenly realized the truth.


    "In the way of light and shadow, Mohism is unique in the world!" pound sighed,


    Li Shimin nodded slowly. This is the difference of Mohism. Other hundred schools know its nature and don''t ask for its reason. However, Mohism directly inquires into the bottom and reveals its secrets one by one. If it were replaced by witches and gods, I''m afraid it would have been playing tricks and cheating people of money.


    "Of course, in addition to refraction, the sun can also reflect. Merton casually pulled out a copper mirror and put it in the sun. Merton turned the copper mirror a little, and suddenly a strong light was reflected to the whole audience.


    "Mojiazi!"


    "Oh, my eyes!"


    ………………


    The crowd immediately covered their eyes and exclaimed.


    "Mo boy, you wait!"


    Pound also covered his eyes and said with hatred. He suddenly thought that Li Shimin was still here and hurried back.


    "Emperor, are you not dead?"


    "Of course I''m fine!" Li Shimin waved his hand.


    I don''t know when Li Shimin has put on a pair of sunglasses and sat there happily. The dazzling sunshine has no influence on him at all.


    "Ha ha! Boy, I''m not malicious. I''m kidding, but if you irradiate the sun for a long time, it will cause blindness and visual impairment. Fortunately, the Mohist school has recently developed a new type of eyes, called sunglasses!" Merton said, took out a pair of sunglasses from his arms and put them on his eyes. With a slight gesture, a Mohist child immediately took a copper mirror and reflected the sun on Merton''s face.


    "You see, as long as you wear sunglasses, you won''t be afraid of the dazzling sun any more." Merton took sunglasses and moved freely under the double dazzling sun.


    "Shit, you stabbed us with the sun just to advertise?" the people in the stands looked at Merton''s sunglasses and immediately complained.