When Li Ke was preparing to make a pendulum clock last year, he took out relevant books and taught them to Li Fu. However, although Li Ke had drawings, he did not directly give them to him.
The first thing I told Li Fu was about the principle of isochronism of the swing, and then I told Li Fu some of the structures of the pendulum clock and asked him to think about it.
Before Li Ke set out, Li Fu had already thoroughly understood this knowledge, and he even figured out some truths that Li Ke did not tell him.
For example, under the premise of the principle of isochronism of the pendulum, this isochronism has nothing to do with the mass and amplitude of the pendulum.
And the vibration period of the pendulum is directly proportional to the length of the cycloid and inversely proportional to the square root of the acceleration due to gravity.
Li Ke has fully proposed the acceleration of gravity, or Li Ke has directly brought out several of Newton's laws. 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 using the large and small gears Li Ke mentioned.
Although it is 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, it is only a matter of time before Li Fu understands the complete pendulum blueprint, and the craftsmen trained in this way no longer just know it but don't know why.
He has understood many principles and principles and has the ability to deepen them.
At least Li Ke knew from Tian Meng that Li Fu had been taking the time to study almost every day for more than half a year, especially mathematics and physics, which were the top priorities of his studies.
"How much does it cost to make a pendulum clock now?" Li Ke asked.
"These parts are very fine. Calculated based on the parts cast by our watch factory ourselves and the springs ordered from the foundry and reserving 100% of the profits for the foundry, the cost for us to make 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 rest can only maintain and repair pendulum clocks at most. It may be difficult for them to make pendulum clocks by themselves. "
"30 steel." Li Ke repeated. This cost is not high. The premise that it is not high is that the cost of steel has been reduced by Li Ke.
"This basic mahogany model is priced at 3,000 yuan!" Li Ke pointed at the 20 pendulum clocks that have been made, about 1 meter in height.
"You have to work hard to develop smaller pendulum clocks in the future. The smaller the pendulum clock, the higher the price. In addition, I will start building a bell tower in Zhuque Square in Chang'an City. When the time comes, it will be built on the bell tower. A huge pendulum clock, then the people in the entire Chang'an City can use the time of this clock tower as the standard." Li Ke said.
Zhuque Square is the intersection of Zhuque Cross Street and Zhuque Street, the front of the Zhuque Gate of the Imperial City of the Tang Dynasty.
"Yes!" Li Fu was a little stressed. For such a large clock tower, it is possible to fully calculate the weight, length, etc. of the pendulum clock. However, if there is a slight problem with the weight during production, the time may not be accurate.
"In addition, the wood outside the pendulum clock, such as mahogany, rosewood and other different woods, has different customization prices. The more expensive the wood, the higher the price. It can also be carved by a carpenter. The better 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 50 times based on 3,000 guan and sell it for 3,500 guan. If the cost of the wood increases by 10 guan, it will cost another 10 guan for the carving master to hire a craftsman. Guan, then sell it for 4,000 Guan." Li Ke told him, "Remember this is the ex-factory price."
"yes!"
"Well, when the time comes, for example, if my Yuelai Trading Company sells it on behalf of others, we will receive a nominal profit of more than a dozen dollars."
"The same is true for other commercial banks. They are allowed to increase their own profits, but the additional sales profits cannot be too much. However, in the short term, the possibility of other commercial banks selling is not high." Li Ke said.
"By the way, when the time comes, you can name the clock yourself. The name should be written on the dial. For example, I will first give one to each department of the three provinces and six departments of the imperial court. You name it, and the six departments will be called Ma series. The three provinces call it the cow series. It will be used by my father at that time, such as the Yinglong series. Even if it is made of the same material, the Yinglong series will be 1,000 yuan more expensive than the cow and horse 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 immediately bent down.
"Your Highness, this is the finance of our factory. I am not good at these things." Li Fu felt a little embarrassed.
"Well, that's good. Leave professional matters to professionals." Li Ke smiled. The financial aspect must have been trained by Yuelai Trading Company. It's okay to leave these matters to them. Anyway, they know how to add them. Profit is enough.
"Remember, if someone asks you in the future, just say that you spent a total of one million yuan to develop the clock. This is the research and development cost." Li Ke thought for a while and added.
"Ah...but...how could your Highness spend so much?" Li Furen was dumbfounded.
That's one million yuan, how can it be spent all?
"Why can't you spend all the time? In order to test the accuracy of clocks in different places, you sent more than a dozen test teams to the east, west, north, and south of the Tang Dynasty. These teams consisted of at least a hundred people. They didn't eat, drink, or have sex. Money? There is no charge for transporting damaged watches and the like?" Li Ke said helplessly.
"Then I understand." Li Fu is not stupid. Just because he is not good at it doesn't mean that others won't understand it after he says it.
"By the way, add our royal certification. In addition, this series of clocks should be called the Ruziniu brand. Carve a couplet on the pendulum clock for me. The first couplet: Spring silkworms will not be used until they die. The second couplet: Wax The tears begin to dry when the torch turns to ashes. Horizontal comment: Serve the people. Remember to add our royal logo. How long will it take to complete the change?"
"This is simple, it only takes one day." Li Fu said simply.
"Let's do it now. I want it tomorrow morning. Tomorrow I will send warmth to the three provinces and six ministries. Speaking of which, I have come back from Nanyang and I haven't sent them gifts yet. It's just right." Li Ke said.
"yes!"
After coming out of the clock factory, Li Ke called Tian Meng over and asked him to find a craftsman and carve a few plaques. Since he wanted to send warmth, it was natural to deliver it in place.
