"What are you?" Finally, the work of these jewelry technicians was discovered by Yang Heng.

"Ah Lang, we wanted to surprise you, but as a result, we were stuck in this place, and the pointer can be rotated, and even the scale division is very accurate, but the speed is not very stable."

Yang Heng carefully observed the clock they made, and he found that the structure of the parts of this clock is very reasonable, all the gears are made of brass, in this aspect, they are qualified, they also know that this brass is the most wear-resistant, and the ratio of the number of teeth of this gear is also very reasonable, and even the number of turns of the pointer is quite reasonable.

Their idea is to turn a circle during the day and a circle at night, which is two circles, the same as the clocks in the previous life, a circle is twelve hours, six hours, although the same time as day and night is not a few days in a year, but they are designed like this, and there is a minute hand, but the rotation of the minute hand is different from the minute hand of Yang Heng's previous life, the minute hand they designed is to rotate a circle is an hour, that is, two hours, that is, this day and night, the minute hand is rotated twelve times, and the design of the second hand is, Sixty laps is one-third of the carvings.

"Your design is basically reasonable, have you ever thought about this big clock, by the way, I call it a clock, or a clock, do you think, this fast-rotating needle, do we let him beat a little, it is a second, this second means, let's put it this way, half an hour, we can design it as an hour, an hour to divide into sixty parts, then one is a minute, and a minute is divided into sixty parts. One serving is a second. You can divide the time according to this calculation. Wouldn't it be better, but we'll look at the rest of the stuff when you've fixed that. ”

If you want to say why Yang Heng is so divided, it is purely because he was used to this distribution in his previous life, this is the reason why he is so divided, and another is that these technicians have already divided the day into two circles, so it should be divided like this. Originally, Yang Heng also wanted to design twelve hours a day into a circle.

"Here, look at my voltmeter." When they renovated, Yang Heng brought a voltmeter, and it was a voltmeter with zero in the middle, and even Yang Heng removed the glass on the surface.

"Look, can you see what?" As he spoke, Yang Heng moved the watch hand to the end, and then the watch hand swung back and forth.

"It swings for a long time." "Well, that's good. This is one aspect, but what else? "Also, it seems that the frequency of its oscillation is the same, right?" After observing for a long time, they finally made such a judgment.

"You all know the structure of this, right?" "You know, we've all been involved in manufacturing, there are two hairsprings here, and a moving coil, you've explained them to us."

"So, you say, if we add such a hairspring to the clock, and add an escapement, and this escapement works like this, it has to be combined with an escapement gear hairspring, three parts, what do you think?"

After Yang Heng's prompting, these technicians finally understood, and soon, an escapement, gear, and hairspring were made. Sure enough, the pointer began to move at a uniform speed.

"Ah Lang, this pointer can really rotate at a uniform speed, but this time can't be adjusted, this hour is much worse than the standard hour."

"You study the hairspring again and see what is the difference between the length of the hairspring and the speed of the swing."

"Ah Lang, it turns out that this is like this, you can adjust the speed by adjusting the length of this hairspring, haha, great, this clock can finally be adjusted accurately."

"You say, if this clock were to be added with a pendulum, wouldn't it look better?" Now that the prototype of the clock has come out, then it needs to be considered in terms of practicality, for the time being, Yang Heng does not plan to add this thing to the clockwork, this, not too anxious, it is okay to use a hammer as power, that is, the clockwork is not the same as it needs to be wound, and now it is a large clock, naturally, this spring spring is still not needed.

"Your Majesty, do you want to build a bell tower in Chang'an City?" Since it has been built, it needs to be sold, especially the first clock, which turned out to be a giant clock, so this thing can only be used to build a bell tower, and the place where the bell tower is needed is naturally Chang'an City. Therefore, Yang Heng asked Li Er to sell it.

"Clock Tower, what is a Clock Tower?" "The bell tower is just a building that keeps time, in the daytime, people can directly see the time, and even on the hour, they can use the bell to tell the time, and at night, they can directly use the bell to tell the time, but if you add electric lights, you can also see the time, but at night you need to see it closely, and during the day, you can see it all over the city."

"That's definitely a good thing to hear you say, is this clock accurate?" "Exactly, the minister has already tested, after five days of testing, it won't be a second off."

"Where do you need to put this bell tower, and how tall does it need to be?" "This, Your Majesty, you see, how about placing it in the middle of Suzaku Street, the height, there are five zhang high, but this still needs to consult Yuan Daochang, I don't know if this has anything to say in feng shui?"

"There is no need to ask Lao Dao's opinion, Lao Dao agrees, it should be good to set up such a bell tower in the middle of Chang'an City." Yuan Tiangang actually walked in from outside at this time. "That, Daoist Yuan, how did you know about this?" "Ha, didn't you take that clock of yours and set it up at home, I went to see it, and I also know that you came to Your Majesty, so I'm in a hurry, you're done." To say, that is, Yuan Tiangang, when he entered the palace during the day, he basically came in directly without notification.

A few days later, just before the arrival of the Spring Festival in the twelfth year of Zhenguan, a bell tower was erected in the middle of Suzaku Street.

"Bell bell ......" calm and powerful bell, finally sounded in the sky above the Tang Dynasty, so, a profession is officially laid off, that is, the watchman, originally, every night, the watchman will beat the gong every other hour to report the time, but after this bell, they are unemployed, however, not all people are unemployed, there are a few people who need to be on duty in the bell tower, whenever the hammer falls, they will shake the hammer to the top, do not let the clock stop, There are also some personnel who are directly transferred to night inspections and patrol with Wuhou. Yang Heng didn't want to let some people lose their jobs because of him.

When building the bell tower, Yang Heng did not let the coppersmiths and silversmiths idle, but let them shrink the parts of this giant clock according to the proportion, so that the family clocks and watches were officially developed, however, these clocks are also heavy hammer power type, in order to make money, Yang Heng can use any method, now use a heavy hammer, and after a while, the heavy hammer will be changed to a spring clockwork, so that some families will buy two clocks, and then, it is a pocket watch that can be wound with them, Then the next is the watch, this is a process of gradual improvement, but also a process of continuous earning, if the watch began to popularize, then it needs to be inlaid with diamonds, after the diamonds, in the sale of a part of the high-end atmosphere of high-grade watches, even gold watches, Yang Heng's purpose, is to put some rich people's money, try to put it in their own pockets, this is in their own pockets, in order to make good use of it, otherwise the money can only be rusty and moldy in some families, waiting for children, But it's not going to grow yet, is it, it's just rusty.

In other words, the Yang family has a factory that can make money and started to build again, and suddenly, Yang Heng found that there are too many factories in his home, and they are too miscellaneous, or some factories can be abandoned, or these factories can be auctioned at a good price. (To be continued......)