Datang: Li Shimin begged me to rebel

When Li Ke was preparing to make a pendulum clock last year, he took out relevant books and taught them to Li Fu, but although Li Ke had drawings here, he did not directly give them.

The first thing I told Li Fu was about the isochronism principle of swing, and then I told Li Fu some structures of the pendulum clock to let him think about it.

Before Li Ke set off, Li Fu had thoroughly grasped this knowledge, and he even figured out some truths that Li Ke didn't tell him.

For example, under the premise of the isochronism principle of swing, this isochronism has nothing to do with the mass and amplitude of the pendulum.

And the vibration period of the pendulum is proportional to the length of the cycloid and inversely proportional to the square root of the acceleration of gravity.

The acceleration of gravity, Li Ke, has been fully proposed, or in other words, several major laws of Newton Li Ke have been directly brought out. These craftsmen always have to learn some principles directly when they come into contact with these.

After he figured out these principles, he also built a simple pendulum clock by using the large and small gears mentioned by Li Ke.

Although not as sophisticated as later generations, the principle is the same.

After he figured this out, Li Ke gave him the complete drawing of the pendulum.

It can be said that after figuring this out, and then getting the complete pendulum blueprint, it is only a matter of time before Li Fu understands the entire blueprint, and the craftsmen taught by this kind of artisan no longer just know what it is but don't know why.

He has understood many principles and principles, and has the ability to deepen these principles and principles.

At least Li Ke knew from Tian Meng that Li Fu had spent almost half a year studying as fast as he could every day, especially mathematics and physics were his top priorities.

"How much does it cost us to make a pendulum clock?" Li Ke asked.

"These parts are very fine. Based on the parts cast by our watch factory and the springs we ordered from the foundry and reserve 100% of the profits for the foundry, the cost of making a pendulum clock is about 30 pieces. , it will take about half a month." Li Fu said.

"How many craftsmen have been trained?" Li Ke asked.

"There are about 400 people, and only about 30 of them are worthy of further training." Li Fu said, "The remaining people can only reach the point of maintaining and repairing pendulum clocks, and it may be difficult for them to make pendulum clocks by themselves. "

"30 guan." Li Ke repeated that the cost is not high, and the premise that it is not high is that the cost of steel has been compressed by Li Ke.

"The price of this basic mahogany model is set at 3000 guan!" Li Ke pointed to the 20 pendulum clocks with a height of about 1 meter that had already been made.

"In the future, you have to work hard to develop smaller pendulum clocks. The smaller the pendulum clock, the higher the price. In addition, I will start building a clock tower in Zhuque Square in Chang'an City. At that time, it will be built on the clock tower. With a huge pendulum clock, the people of the entire Chang'an City can use the clock tower's time as a standard." Li Ke said.

Zhuque Square is the intersection of Zhuque Heng Street and Zhuque Street, in front of the Zhuque Gate of the Palace City of the Tang Dynasty.

"Yes!" Li Fu felt a little stressed. It is possible to completely calculate the weight and length of the pendulum clock for such a large clock tower, but when making it, there may be a slight problem with the weight, and the time may not be accurate.

"In addition, the wood outside the pendulum clock, such as mahogany, red sandalwood and other different woods, has different customized prices. The more expensive the wood, the higher the price. It can also be carved by a carpenter. The more beautiful the carving, the higher the price. "

"For example, if the wood is more expensive and the cost increases by 10 guan, you can multiply the newly increased cost by 3000 times on the basis of 50 guan, and sell 3500 guan. If you don’t have a guan, then sell it for 10 guan.” Li Ke explained to him, “Remember this is the ex-factory price.”

"Yes!"

"Well, when the time comes, for example, if my Yuelai Trading Company sells it as a consignment, we will charge a symbolic profit of more than a dozen."

"The same is true for other commercial firms. They are allowed to increase their own profits, but the added sales profits should not be too much. But in the short term, the possibility of other commercial firms' sales is not high." Li Ke said.

"By the way, when the time comes, you can name the clock yourself, and the name should be written on the dial. For example, I will give one to each department of the three provinces and six ministries of the imperial court. You name it. The six ministries are called the Horse Series. The three provinces are called the Niu series. At that time, I will use them for my father, such as the Yinglong series. Even with the same material, the Yinglong series will be 1000 more expensive than the Niuma series."

"Yes...do you remember that?" Li Fu scratched his head, then looked at a young man behind him and asked.

"I remember." The young man Li Ke bent down and said.

"Your Highness, this is the finance in our factory. I'm not good at these things." Li Fu was a little embarrassed.

"Well, it's pretty good, professional things are left to professional people to do." Li Ke smiled, the financial aspect must have been cultivated by Yuelai Commercial Bank, and it's okay to leave these things to them, anyway, they know how to increase Profit will do.

"Remember if someone asks you in the future, just say that you spent a total of 100 million guan on the research and development of clocks and watches. This is the research and development cost." Li Ke thought for a while and added another sentence.

"Ah...but...how can your Highness spend so much on this?" Li Furen was dumbfounded.

That's 100 million guan, how could it be possible to spend it all?

"It can't be spent. In order to test the accuracy of clocks and watches in different places, you sent more than a dozen test teams to Datang in different directions. These teams are composed of at least one hundred people. Money? Don’t you need money to transport the damage of these clocks?” Li Ke said helplessly.

"Then I understand." Li Fu is not stupid, and being not good at it doesn't mean that others don't understand after saying it.

"By the way, add our royal certification. In addition, this series of clocks and watches should be called Ruziniu Brand. Engraved a couplet on the top of the pendulum clock. The first couplet: Spring silkworms will die when they die. The second couplet: Wax The torch turned into ashes and tears began to dry. Hengbiao: Serve the people. Remember to add our royal logo. How long will it take to complete the revision?"

"It's simple, one day is enough." Li Fu said very simply.

"Do it now, I want it tomorrow morning. Tomorrow I will send warmth to the six departments of the three provinces. Speaking of which, I have come back from Nanyang, and I haven't given them gifts yet, just right." Li Ke said.

"Yes!"

Coming out of the watch factory, Li Ke called Tian Meng over again, and asked him to find a craftsman and carve a few plaques. Since he wanted to send warmth, he had to deliver it.