The idea of going wherever you want is difficult to achieve in this era, and sometimes Lao Luo himself hates why he didn't learn a little more about sailing, at least he can build a ship by himself, and then casually walk around the world along the sea route.

In the same way, it is impossible to see whomever you want, and this era does not have the fast pace of later generations - a phone appointment can quickly arrange an agenda. The Kingdom of Fatima has entered a period of stability, and everything is not in a hurry, like this kind of meeting with the deputy minister of commerce of a country, Lao Luo should not take it seriously, and Camille is also a matter of one sentence, but when it comes to the minister of state, many different arrangements need to be changed.

So, when Camille said that he needed to wait for the time arrangement, Lao Luo decided to simply find something to do for himself. I dismantled the simple theodolite I had modified, and then found a parchment quill, and drew a drawing of each part in pages, and then drew a few drawings of customized copper sleeves.

Then head to Cairo's Artisan Street, where you'll find more than 100 goldsmiths' shops, dozens of jewelers' shops, and a wider range of musical instruments and furniture.

The drawings in his hand were divided into more than a dozen by a page of drawings in Lao Luo's shop, and then he found a lapidary to order crystal concave and convex lenses that fit the size specifications. On these things, Lao Luo spent five or six days, no way, did not enter the society of the industrial assembly line era, all the measurements are each craftsman has its own standard, just to explain the uniform size and specifications of the waste of too much time, in this regard, there is no difference between the Arab craftsmen and the ancient Chinese craftsmen.

As for the polishing of the lenses is relatively simple, the gem craftsman has created a skilled process of grinding all kinds of gemstones, but the transparent crystal stone with no impurities is not easy to find, and it is also necessary to find the time of the source of the material and the time of hand-making.

After finishing these, in fact, after drawing the drawings, Lao Luo reassembled and put away the original folding telescope, and fortunately, when disassembling and assembling, the main structure was not damaged much, but it is inevitable that there are many more carved scales and symbols on the surface of the telescope.

There are actually a lot of trivial things, and I really didn't pay attention if I didn't calculate carefully, Lao Luo, a strong man, had to be annoyed, and the work of the logistics nanny was really difficult.

Seeing that it is going to autumn, if you go to the north, you will inevitably have to order some cold-proof clothes, otherwise Lao Luo, who is not very afraid of the cold, will be fine, Naga and Mnaki may not be able to bear it, and Cui Shiba, who was born in Mombasa, is also a child who has never seen snow. Making clothes and matching armor at the same time is a big set of trivial things.

In addition to armor, the wear and tear of weapons is also a troublesome thing, and the rifles of later generations also have the number of shots, not to mention the weapons such as knives that need to be chopped in this era? After a battle, it is normal to cut a few knives, so the weapons of Eighteen Lang and Mnaki urgently need to be replenished, and the weapons of Naga are easier to say, anyway, they rely on the weight to smash people, as for what kind of shape of things to smash people, it is estimated that the people who are smashed cannot put forward effective opinions.

In addition to these melee weapons, long-range weapons should also be considered, although it may not be possible to cultivate good archery skills in a short period of time, but this matter must not be ignored. So bows and arrows had to be ordered according to everyone's arm strength, and of course the innkeeper Maher could help with this, and Lao Luo and his party stayed in his hotel, which was very deterrent to some street thugs and unruly foreign tourists - not only the streets of China are rich in three religions and nine streams, but there is no shortage of idle people in the Arab world.

On this day, just after returning from outside, the owner of the Maher Inn sent a man to call him, "Sir, the boss asked me to inform you that a big man is coming to you." ”

"Big shots?" Lao Luo, who was a little puzzled, asked the guy, "Didn't your boss say which big man it was?" ”

"The boss didn't say it, and we didn't know each other," said the young man mysteriously, "not like the people from the royal palace, but a little like the holy Mecca." ”

Lao Luo knew that the young man didn't necessarily know who it was, but how could the people of Mecca find him? With doubts, Lao Luo walked to Maher's VIP reception room.

The reception rooms are spacious and ornate, and are usually used by old Maher or other residents to entertain visitors. At this time, except for a few innkeepers standing at the door, there were only the owner Maher and a slender man with a scarf and a beard.

Seeing Lao Luo walk in, Old Maher, who was still greeting, quickly stood up, "Come, come on, Bartol, this is a guest who came to find you, this is ......"

"You're Mr. Bartol?" The bearded man interrupted Maher and stood up directly and asked, "Mr. Bartol, who made a lot of parts in Artisan Street?" ”

"I'm Bartol, who are you?" Lao Luo felt a taste of later scientists from the other party, so he didn't care about the other party's impoliteness.

"Oh, I'm sorry, I'm Al Hassan ibn Al Haytham," the bearded man then said in a brisk voice that Lao Luo barely understood, "you can call me Al Hassan or Ibn Al Haytham!" ”

"Oh, Mr. Ibn al-Haitham, it was you." Lao Luo suddenly remembered the university scholar mentioned by Camille a few days ago, "I really didn't expect that you could come to visit me......"

"No, no, I came recklessly, call me Alhasen, I'm still used to hearing that." Alhasan or Ibn al-Haitham said incoherently.

"Okay, Alhasen, you came to me because ......" Lao Luo is really not a person who will be ecstatic because he sees a celebrity, even in later generations he has not seen a so-called celebrity, not to mention that I don't know if the bearded guy in front of him is just a guy with the same name and surname.

"That's right, I often order goods from Artisan Street, and by chance I know that you, Mr. Bator, have also ordered some very delicate little things." The bearded man, Al Hassen, was finally a little embarrassed, "I really didn't mean to be listening to your secrets...... I, I'm a researcher. ”

"Aha, nothing, I see. Well, is it okay to go to my place of residence and talk? Lao Luo immediately understood the meaning of Alhasen's coming, but obviously this is not the place to talk about this, "Mr. Maher, I will go to my residence with Mr. Alhasen to talk, so I will not delay your matter, and thank you for your announcement." ”

"When, of course......" Maher, who was still a little excited, still did not recover from the state, the value of knowledge in this era cannot be estimated, a scholar and a religious saint are almost equal status, no wonder the young man would say that the guest is from Mecca, as far as Maher's performance is concerned, it is strange not to be regarded as a saint worshipper by the young man.

Guiding Al-Hassen to his residence, Lao Luo was able to determine from the conversation on the road that this was the Ibn al-Haitham recorded in the Arab history books. This is a treasure, much more precious than any gold, silver and jewelry, this is a multi-talented scientist, who has made great achievements in astronomy, medicine, philosophy, mathematics and physics, and is known as the scientific champion of Muslims and the model of Islamic scientists. Especially in optics, this person is inevitably mentioned in almost all optical textbooks in later generations, and Lao Luo only knew such a character when he was learning to use some special equipment.

Therefore, Lao Luo did not hide some questions about Alhasen, such as what the scale on the theodolite part represents, what is measured, and what is the function, all of which are briefly explained. Of course, a question often leads to a myriad of questions, and Al Hassen, who is full of why, can't help but be a little at a loss.

"As you say, we live on a giant ball...... "Alhasen's eyes are clearly out of focus, "so why don't we fall?" ”

"It's probably the big ball itself that generates a lot of power and attracts us." Lao Luo followed his train of thought and said.

"Tremendous force, tremendous force generated by such a big ball, so why aren't we squashed?" Alhasan pulled the beard off his face and asked.

"Maybe it's all the creatures that live on the planet, including our body structures, that can support and resist such forces." Lao Luo can only express the problem in the language of this era as much as possible.

After a long speechless speech, Alhasan said, "Really, I really didn't expect that there are so many unknowns, how do you know, Mr. Bartol?" ”

"What ...... me" Lao Luo is destined to be impossible to say that he is from the afterlife, does he tell him that in the future, human beings will be able to fly around the world in just a few days? So he had to follow the fool that people can understand nowadays, "My family and I have spent more than ten years walking around the big ball at our feet. ”

"How did you get there? What's in the distance? Alhasen sat up straight and stared at Lao Luo, as if you didn't tell me, I would never give up, and I wouldn't leave.

"I can't say it all, but I can prove that there is no abyss, there are no so-called gods, there is no ......" Lao Luo was embarrassed to say that there is no "Allah" or anything like that, you must know that this is the center of Islam.