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  "La la la, la la la, I am a little newspaper vendor..."

  On his way home, Lin Hong hummed a happy tune of selling newspapers.

  In his hand, tightly grasped, was precisely that issue of "China Wireless" magazine, except this one wasnt a half-truncated leftover, but rather a complete and intact copy, although somewhat old, yet extremely well-preserved.

  Lin Hong was still shocked at what he had just seen, he did not expect that under the black cloth, a wooden cabinet about three meters wide and two meters high was hidden, and on it were books arranged in rows!

  This was Lin Hongs first time seeing so many books, and each one was very thick, all were large volumes.

  Lin Hongs memory was very good, he glanced at it all the way and remembered the names of most of the books, including "Fundamentals of Electromagnetic Fields", "Short Wave Communication Circuit Design", "High Frequency Circuit Principles", "Communication Principles" ... and so on.

  Apart from a few literary works, most of them are books about wireless electricity, circuit design and wireless communication, including Chinese and foreign languages, dazzling and varied, making Lin Hongs eyes dazzled.

  Lin Hong was not aware of the value of these books, although he was shocked that Old Xu had so many parameters, but he didnt think much about it. He just plucked up the courage to ask before leaving if he could borrow the magazine called "China Wireless" from the canvas shed.

  Old Mr. Xue readily agreed, and he also took Lin Hong to another room, where they saw several large boxes of magazines and newspapers. Old Mr. Xue found a complete version of the tattered magazine from one of the boxes.

  At this time, Lin Hongcai realized that the really good things had been sorted and collected by Old Xu in his home, and those outside were all waste to be disposed of.

  When Lin Hong passed by the villages small shop again, he still resisted the temptation of sour plum powder and big bubble gum, and didnt bear to spend the five cents "huge sum" in his hand. In his heart, there was another plan, he decided to save this money first, just in case.

  As soon as he returned home, Lin Hong eagerly opened the "China Wireless" magazine and started reading. The first thing he looked at was still the "Story of Wireless History", which he had not finished reading before.

  From the late 19th century to now, it has been over a hundred years of history. During this time, radio communication has gone through a process from nothing to something and developed into todays relatively perfect technology.

  This article was purely introductory and did not involve any technical knowledge, but it sparked Lin Hongs great interest in wireless.

  The next day, he arrived at Old Xus doorstep early in the morning, which made Old Xu, who had just gotten up for his morning exercise, slightly surprised.

  "Uncle Xü, Ive come to return the book."

  Lin Hong opened the door and got straight to the point.

  "Oh? Finished reading so quickly?"

  "Uh-huh!" Lin Hong nodded very seriously, hesitated for a moment, and finally mustered up the courage to ask, "Uncle Xu, Id like to borrow another book, is that okay?"

  Old Xu just casually asked, that magazine although not many pages, but if you really want to carefully read through, an adult with relevant knowledge is also a bit difficult. In his opinion, Lin Hongs "read" was just flipping through it, and for children of this age group, only pictures are their favorite content.

  At that time, Old Xu didnt think the magazine was suitable for Lin Hong to read. He recommended several excellent and rare books to Lin Hong, but Lin Hong stubbornly insisted on borrowing the magazine. Only then did he agree to lend it to him, reminding him not to damage any of the pages.

  So today Lin Hong came so early to return the magazine, it can be said that it was within his expectations. According to his idea, Lin Hong must have flipped through a few pages yesterday and then completely lost interest.

  Old Xu took the magazine handed over by Lin Hong, saw that the magazine was intact, and even new folds were not available, it can be seen that Lin Hongs protection of it is still very careful.

  "He smiled and said: Grandpa told you yesterday that this magazine is now completely incomprehensible, but you didnt listen. Now youre regretting it, arent you?"

  "Grandpa, I dont regret it at all. This book is really good, Ive already finished reading it."

  "Finished reading? Hmm, not bad." Old Xu said with his mouth, but he didnt think much of it in his heart. He continued to say, "What book do you want to borrow this time? Or Ill lend you that The Legend of Yue Fei, that little peoples book is very interesting, youll definitely like it."

  Lin Hong shook his head: "Grandpa, I dont want a childrens book. The name of the book I want to borrow is Principles of Radio Simplified."

  "Principles of Wireless Telegraphy"?

  Old Xu was really stunned. If an adult had asked him to borrow such a professional book, he might have been able to accept it, but hearing this from the mouth of an eight-year-old child made him feel very strange.

  "Lin Hong, how did you think of borrowing this book?" Old Xu asked curiously.

  I saw an article in this book that detailed the production principle of a "crystal radio", and I wanted to make one myself. It said that if you want to understand the basic principles of crystal radios, its best to study the book "Principles of Radio" first.

  Lin Hongs answer made Old Xu even more surprised, yesterday he had briefly flipped through that issue of the magazine, and indeed there was an article about making a "stone radio" tutorial. It seems that this child really did read that magazine.

  "Its possible that this kid happened to see that article and it just sparked his temporary interest."

  Old Xu thought in his heart that after all, this kind of self-made content was also very attractive to children.

  "Good boy, really great!"

  Old Xu first praised Lin Hong for a while, then continued: "Since you want to see this book, Ill go find it. Although the crystal radio looks simple, its actually quite difficult to make it successful. Lin Hong, if theres anything you dont understand during the making process, feel free to ask Grandpa at any time. If youre missing any components, come straight to me and Ill provide them. There may not be many complete things here, but we never lack those small parts."

  "Thank you, Grandpa!"

  Lin Hong heard the words with great joy, originally he was embarrassed about how to open his mouth to Old Xu, after all, the materials for making a mineral radio, although he could find some by himself, but still lacked some important parts.

  Lin Hongs gratitude towards Old Xu was truly beyond words, he wasnt very good at speaking, and could only deeply bury this feeling of gratitude in his heart.

  Lin Hong followed Old Xu back into his bedroom again.

  As the black cloth was pulled open, he faced a bookcase with books arranged neatly and tidily. Although he had mentally prepared himself, he still felt extremely shocked.

  "Principles of Radio Simplified..."

  Old Xu muttered the name of this book, put on his old glasses, and began to search inside the cabinet.

  Although he knew that he had indeed collected this book, but where exactly it was placed, he didnt know. After all, there were too many books. Although he had numbered the compartments of this cabinet in order like a librarys bookshelf, he hadnt spent extra time systematically organizing and numbering them. He just roughly categorized similar types of books together.

  Old Xu walked from head to toe and searched all over but couldnt find it.

  At this time, Lin Hongs voice suddenly came from beside his ear:

  “486…”

  His voice was somewhat vague, and Old Xu looked back at him in confusion. He saw that he was standing on the right side of his own workbench, curiously observing his wireless radio, and had not been following behind him at all.

  He adjusted his old flower-shaped glasses and continued searching for that book.

  "Found it!"

  Old Xu saw that this book was placed next to a book called "Principles and Design of Transistor Receiver Circuits", because the book was too thick, it just happened to slightly cover up "Concise Wireless Principles" so that he ignored it several times when searching here.

  Old Xu pulled it out from among the crowded books, the pages had turned yellow badly, and it could be seen that this book was already some years old.

  "Thank you, Grandpa!"

  In the courtyard, Lin Hong thanked him politely again and happily took the book home.

  "This child really understands manners." Looking at the distant Lin Hong, Old Xu smiled and said. "Its just a pity that this child had a head injury in the past, so..."

  Lao Xutou is so good to Lin Hong, on the one hand because of sympathy, and on the other hand because he also has a granddaughter about the same age as Lin Hong, but due to some reason, he temporarily cannot enjoy family happiness.

  He returned to his room and covered his collection with black cloth again. The reason for doing so was mainly that sometimes guests would come to his house, and when they saw these books, although there was nothing wrong with them, he still needed to explain things to them. After a long time, he simply covered the books up, so as not to cause others to be shocked or surprised.

  But the next moment, he pulled open the black cloth again, because a sentence that Lin Hong had just whispered suddenly flashed into his mind:

  “486…”

  He realized that the horizontal and vertical rows of his bookshelf were designed in numerical order, with two-digit numbers written on top, such as the first row and fourth column, then the grid number would be "14".

  He found the location of that book again, which was next to "The Principles and Design of Crystal Tube Receiver Circuits" that big-headed book. He was extremely shocked to find that the number of the grid where it was located was clearly "48", and the sixth book in this grid turned out to be the one Lin Hong had just borrowed.

  "This cant be right, maybe I misheard."

  Old Xu shook his head and said so to himself.

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