When Cao Yi and Red Sleeves were discussing, Liu Baiqing came in with a box, followed by Wang Zhiyuan. This combination surprised Cao Yi a little. One of these two people is in the secret camp outside the city, and the other is in the drunken immortal building inside the city, how did they get together?

"You guys?" Cao Yi asked in surprise.

Liu Baiqing smiled excitedly and said: "I called the military advisor over, isn't this the son you said yesterday that the secret is very important, I got stuck in the afternoon to go to the coppersmith to get the copper pipe, and then went to the drunken immortal building by the way, and called the military advisor over." ”

"Oh, yes, there are a lot of things today, forget about this thing, come on, let's go into the house to get it, and Red Sleeves, you go and call the master who knows how to inlay in the house."

"No need, Cao Yi, have you forgotten that I am still the steward of Cao Mansion, I have already brought someone over." Wang Zhiyuan laughed and said.

"Uncle Wang, it seems that you two are more anxious than me," Cao Yi said with a smile

"Childe, who are those outside?" Liu Baiqing asked as he entered the door while looking back at the things placed in the yard.

"Oh, I waited in the living room for a while in the morning with Lu Lao, and I remembered this thing when I was idle and bored, so I made this thing when I had time in the afternoon."

"What's that?"

"For bathing and washing hair." Cao Yi said casually.

"Oh...... No wonder there's a scent. As soon as she heard that it was used for bathing and washing her hair, Liu Baiqing lost interest.

However, Wang Zhiyuan heard Cao Yi say that it was for bathing and washing his hair, and looked back thoughtfully.

Cao Yi entered the house, took out the box containing the crystal pieces, and put it in front of the inlay master. "Well, I'll leave it to you."

"Yes, Childe, the old slave will get it for Childe right away." The level of the inlay master is good, according to the copper tube one end and one tail corresponds to the lens one small and one large, all of a sudden a crystal piece is installed, and after half a cup of tea time, the other end is also installed.

Cao Yi excitedly took the copper tube that had just been installed from the inlay master, pointed the camera at the window and looked at it, adjusted it while expanding and contracting, and then turned his head and shouted to the people who were waiting anxiously next to him: "It's successful!" See it clearly. ”

"Come on, come on, let's go out to the yard to see, the view in the yard is more open!" Cao Yi took the lead out of the Cultivating Heart Hall, came to the courtyard, took the copper pipe and looked at the Drunken Immortal Tower in the distance, and then motioned for Wang Zhiyuan to step forward and handed him the telescope in his hand.

"Uncle Wang, you come and try it, you will know why I said this thing is very important."

"Good!" Wang Zhiyuan stepped forward expectantly, learning from Cao Yi's appearance, one eye was closed, one eye was facing the small lens of the telescope, and he was also looking in the direction of the drunken immortal building, and after a flick of his fingers, Wang Zhiyuan turned his head excitedly to look at Cao Yi, his eyes were complicated, full of excitement, excitement, doubt, incredible, or disbelief.

Cao Yi smiled and nodded at him, as if to tell him that this was the case. Wang Zhiyuan hurriedly turned his head again, looked at it carefully, and then rotated the direction, from left to right, and then from right to left, this time he looked at it for a long time, and Liu Baiqing was anxious behind him, but then he couldn't bear it, and said directly: "Strategist, you also let me see, what is it like!" ”

Wang Zhiyuan reluctantly handed the binoculars in his hand to Liu Baiqing, with an excited and excited smile on his face, he retreated to Cao Yi's side, and also looked at Liu Baiqing with a look of watching a play.

Sure enough, Liu Baiqing didn't flick his fingers this time, and turned his head to look at Cao Yi and Wang Zhiyuan in the same way as Wang Zhiyuan before, his eyes were also full of excitement, excitement, doubt and disbelief.

At this time, Wang Zhiyuan couldn't help but blush, and wondered in his heart, when Cao Yi looked at his eyes just now, was it just like he was looking at Liu Baiqing now, and he actually laughed at him for not having knowledge, but thinking that he had just come into contact with this 'copper pipe', Cao Yi seemed to have called it so. Thinking of this, Wang Zhiyuan opened his mouth and asked, "Cao Yi, what is this thing called?" ”

"The telescope can also be called the Thousand Miles Divine Realm!" Cao Yi had a faint smile, and he was secretly proud in his heart, "What's the matter, I'm stupid!" ’

Telescopes, according to the history of future generations, took at least 600 years to be invented in Europe, and now they have been so long in advance, it can be said that it is the product of this era across time and space, if they are not scared, it is that the psychological quality of these people is too hard.

After another moment, Cao Yi opened his mouth and said, "Bai Qing, you have been watching it for a long time, and you can also show Red Sleeves, she is still in the back." ”

Liu Baiqing was a little reluctant to hand the telescope to Hongyan at this time, and said with a smile: "I was too absorbed in it for a while, I'm sorry, red-sleeved girl." ”

Red Sleeves hurriedly responded, and also learned the movements of the previous three to look up, as soon as his eyes met, he exclaimed, turned his head and looked at Cao Yi with a surprised face, and then compared with the eyes that he had turned around when he looked at the teacher and Liu Baiqing's eldest brother in the back because he was too surprised, he couldn't help blushing, and quickly turned back to continue looking, provoking Cao Yi, Wang Zhiyuan and Liu Baiqing to let out a hearty laugh.

"Childe, what's the name of this thing?" Liu Baiqing still had a smile on her face and asked happily.

"......" Cao Yi looked at Liu Baiqing speechlessly, and said a little strangely: "Uncle Wang asked this question just now, didn't you hear it?" This is called a telescope, and it can also be called a clairmile mirror. ”

"Haha, I was so engrossed in what I saw just now that I didn't notice what you said to Childe and the military advisor...... Haha" Liu Baiqing touched the back of his head and said with a wry smile.

"Ahh Childe, I saw Musk Yue, she went out in this dress in the morning, I saw her! Red Sleeves shouted happily in front, and at this time, the innocence and vitality of a seventeen-year-old girl could be seen from her.

"Well, the straight-line distance from here to the Drunken Immortal Tower should be two miles, and this is a multiple of the Thousand Mile Divine Mirror is ten times, which is equivalent to the distance of about eighty steps in front of you, so you can see it." Cao Yi responded to Red Sleeves and explained how it worked.

"Cao Yi, how do you say this?" Wang Zhiyuan still didn't understand a little and asked.

"Hmm...... This Thousand Miles Divine Mirror, the magnification is ten times, which is equivalent to an item, which was originally a hundred steps away, but through this Divine Mirror, an effect can be achieved, that is, to make that item appear at a distance of ten steps from you, the same reason, joining a team of centaurs, originally a thousand steps away from you, and now through this, this thousand steps away centaurs are equivalent to being in your field of vision a hundred steps away. Cao Yi explained with an easy-to-understand example, so Wang Zhiyuan and Liu Baiqing both understood.

"Then in the future, when the army is marching and fighting, especially on the plain without shelter, isn't it very advantageous, you can know the opponent's marching formation and approximate number of people early, and in the complex terrain, with this Thousand Miles Mirror, you can find the other party early, but the other party may not know where you are?" Liu Baiqing said excitedly.

Cao Yi nodded and said with a smile: "In a sense, this is indeed the case, so I said this was very important yesterday, and now you believe it, right?" ”

Wang Zhiyuan nodded approvingly, and said: "That's true, and a concave crystal piece and a convex crystal piece, combined like this, will exert such a magical effect, it is really unimaginable, but if this clairvoyant mirror knows what the principle is, it is not difficult to make it, no wonder Cao Yi You have to be careful and careful, cautious and cautious." ”