[I overestimate myself too much, I can't write anymore because I am dizzy, and the remaining one is put before noon, please forgive me. ] 】

Railways are helpless and subject to financial and geographical constraints.

Han Gang will not be in a hurry, before the steam engine, the role of the railway is not obvious, and it is not yet time to renew.

I don't know how long the desired track will be delayed, Feng Congyi is a little unhappy, "Then brother, what are you doing now?" ”

"Write more when you have time." Han Gang said, "I am writing a paper for Nature on three-phase transformation. ”

"Three-phase conversion?" Feng Congyi read this unfamiliar rhetoric.

"Three-phase – solid, liquid, gas. In the case of water, it is ice, water, and steam. Han Gang talked eloquently in front of his cousin, "Everything in heaven and earth, as long as it is not a living being, whether it is a stone or a hardware, there is a problem of three-phase transformation. ”

"Can a stone turn into water?" Feng Congyi was surprised.

"How did the glass come from?" Han Gang asked rhetorically.

"Oh." Feng Congyi suddenly smiled and said, "Little brother forgot." ”

"Gold, silver, copper, iron, tin and other hardware can be turned into liquid, as long as it is heated by fire. If you want to continue to gasify, you need a stronger firehead. Mercury is also a metal, and if it is in extreme cold, it will solidify quickly. If it is placed outside, it will soon vaporize and disappear. Mercury gas is highly toxic, so the workshops that produce mercury must open doors and windows, otherwise the craftsmen inside will not live long. ”

"I remember my brother once said that if he wanted to make a thermometer, he wanted to use mercury."

"It's different." Han Gang shook his head, and the thermometer was hot. The principle of expansion and contraction is used to design thermometers. Han Gang once mentioned to Feng Congyi that he asked the craftsmen of the glass workshop to make thin glass tubes that can be filled with mercury, make them into thermometers, and apply them to experiments.

"The reason why the gunpowder in the firecracker can explode is also because it turns into gas?"

"It's a chemical change, through combustion, into a different substance. The vaporized product cools it down, or it turns back into its original form. After the gunpowder has been burned, it will not turn back into gunpowder when it cools down. ”

The definitions of physical change and chemical change have been given by Han Gang in his paper. Taking out gunpowder as a counterexample in the paper is actually disclosing the explosion principle of gunpowder.

From theory to practice. Just like Feng Congyi can think of firearms, other people of insight can understand the principle of firearms, and since they understand the principle of explosion, they also know how to improve it.

Feng Congyi didn't dwell too much on inventions, but quickly jumped to another problem

The Ping An is getting bigger and bigger, and there are more and more people of all kinds who come to borrow money.

Collect cash in the capital, give vouchers, and redeem cash when you arrive in Qinzhou. In this way, there will be more and more cash in the Beijing branch, and the coins in Qinzhou will continue to be delivered, and it will inevitably be unable to support it after a long time.

However, because the business focus of the Ping An is still internal, almost all the businesses that use flying money are members of the Yongqin Chamber of Commerce. Therefore, after returning to the capital, it will not be immediately transferred, and gradually turned into an account, holding a registered golden ticket as a voucher. Then buy the internal goods in the Chamber of Commerce, go to the general number and make the delivery.

In Feng Congyi's view, these golden tickets can be used as money in the future. But in Han Gang's view, credit should be cultivated slowly and not in such a hurry. For the future, it is worthwhile to cultivate credit in a few years or ten years.

The Qixi begging banquet should be almost over, sending Feng Congyi away, and Han Gang returned to the backyard.

Han Gang is not very interested in festivals, but the wives and concubines in the house are inconvenient to go out on weekdays, and the few festivals are when they can rarely have fun, and Han Gang will not make trouble

Anyway, Wang Yi is measured and won't make too much trouble.

But when Wang Yi came back, he was full of wine, and he walked crookedly.

"How much did you drink?" Han Gang asked in surprise.

"I didn't dare to drink more," Wang Yi sat down on the edge of the bed, "I drank too much after drinking two glasses of osmanthus sweet wine." ”

"Osmanthus liqueur is not simple, but two glasses are intoxicating enough." Han Gang said that osmanthus sweet wine is indeed a sweet wine with a relatively light taste, but in fact, the alcohol content is very high, but it is suppressed by other flavors. If you're not careful, you'll easily get drunk. After speaking, he asked again, "Did you lose by guessing boxing?" If the family is comparing boxing, it should be Yun Niang first, and you are the last,"

"Actually, it's three or four cups, and then I didn't care much about it." Wang Yi said drunkenly.

"In the past few years, you've been drinking a little more."

"yes, it's a little bigger." Wang Yi stroked her hot forehead, "Yun Niang didn't drink at all, but she still had to drink, and she fell asleep with two glasses." Su Xinyuan refused to drink more, but she lost a few times in a row, and was forced to pour a few cups by Nan Niang. ”

"Where's Nanniang?"

"Nanniang is not drunk, she just sent Su Xin and Yun Niang back to sleep." Wang Yi tugged at Han Gang's cuffs, "Official, do you want to call Nanniang too." ”

When Wang Yi said this, his cheeks were flushed, his eyes were rolling, and a rare charm on weekdays bloomed in front of Han Gang's eyes.

Han Gang's heart was pounding, but after thinking about it, he still shook his head, "Forget it, let's sleep well today." Save yourself from regretting it tomorrow. ”

Not wanting to be tempted again, Han Gang let Wang Yi fall asleep and stepped out of the room.

After coming out, Han Gang regretted it a little, it was rare for his wife to take the initiative, and he still pretended to have a high profile, did he pretend to be too much.

However, the authority of the mistress must be maintained, and she must not be bullied, otherwise it will be difficult to run the house.

At this time, it is already July, although it is still hot, and the night wind is also hot, but it is also autumn.

Autumn is the time of harvest and the time of collecting money. The government has just received a sum of money – it is to the treasury.

Treasury bonds have finally come to the fore today.

The two phases and two staff members signed and painted at the same time, and the six bonds with a face value of 100,000 yuan were stamped with a large seal under the door of the Chinese book, all like a holy order to follow the rhythm of the normal process in the political hall. Even the bonds themselves were made of five-color hidden flower silk paper specially used by the holy decree, and the people could not imitate them for a while.

The repayment period of the first tranche of the Treasury is three years, with interest of one cent, secured by a salt tax. With only 10 percent interest for three years, it is impossible to find a loan with such a low interest rate in this era. Even if it is put in the future generations, it is very rare.

I heard that Empress Taishang's mood is very good. In the past, the inner treasury only had to pay for it, that is, it was lent out and then returned, and there was no interest on it.

In addition, the 600,000 yuan that used to be paid to the three divisions on time every year will be regarded as a loan to the government from next year onwards, and will be directly credited to the government's account, instead of the three divisions. It's just 60,000 yuan, and you can make it up anywhere. These 600,000 guan are special treasury bonds, and they must be lent every year - after all, the inner treasury has always allocated 600,000 guan to the three divisions every year - but the difference is that these 600,000 guan must be recorded and paid with interest. It's just that there is no need to return the principal, and the interest is only repaid in three realms, and the interest is also one point in three years. The interest given is not very high, and even the principal is gone. However, in terms of the inner treasury, at least the money lent out, although the capital could not be returned, the interest was returned. Compared with the pure money before, it made Queen Taishang more satisfied.

As for the situation that there is an urgent need to use the treasury silver in the future, we will discuss it when the time comes. However, it is basically fixed at three years, and as for shorter government bonds, there are still expectations. Interest rates vary from year to year, half a year, at different times, but in general they are very meager.

For the national debt, the three divisions should be the most angry, the money does not go through their accounts, but the interest is to be repaid by the three divisions, and the salt tax is the largest source of monetary tax in the hands of the three divisions. The government did not have financial power, and the revenues from the new laws, such as the seedlings and the exemption from military service, were all transferred to the treasury of the Dongfu, but none of the prime ministers and the political participants thought of paying the interest on the government bonds from the income of the seedlings loan.

After Han Gang heard the return, he put it aside.

The specific interest and fiscal and tax arrangements can be handed over to experts to do, and they will not be unable to repay the accounts anyway. When you really can't afford to pay it back, it's a big deal to pay it back today, and then lend it out tomorrow, and you don't even need to change the warehouse, you can just walk through the ledger. This is a victory for accounting.

"Daddy!"

Han Gang was thinking about things at the door. When he heard the sound, he turned around. I saw Jin Niang walking in front, followed by two personal maids, and her nurse.

Jin Niang was holding a tray with a teacup on it, and the three people behind her, whether it was a maid or a nurse, were all empty-handed.

"Jin Niang, why haven't you slept yet?" Han Gang asked strangely.

Usually at this time, the children in the family have already gone to bed, unless it is the New Year, Han Gang will not support the children in the family to stay up late.

When Jin Niang arrived in front of Han Gang, she bent her knees and blessed herself, and then raised her head and said obediently, "Niangniang and Aunt are drunk." Jin Niang went to the kitchen and asked Li's mother to make a sobering soup. ”

"Oh? Is it? Han Gang was surprised, and then he was happy, his daughter has grown up, and she knows what filial piety is.

"Daddy?"

Seeing that Han Gang asked, he didn't react. Jin Niang looked at Han Gang cautiously, looking a little worried.

The daughter wants to be filial, and Han Gang of course supports it with both hands.

"Alright, let's get in." Han Gang smiled and stepped out of the way, "Your mother is just about to drink." ”

"Hmm." Jin Niang laughed happily, nodded vigorously, and then carefully crossed the threshold.

After a while, Jin Niang came out of the room, bouncing around with a tray, "Niang Niang is very happy, I'm praising Jin Niang." ”

"Hmm." Han Gang nodded lightly, "You are filial, of course your mother will be happy." ”

"Jin Niang knows."

"Alright, hurry up and send it over to the aunts again. Then go back to bed early. Han Gang instructed his daughter and glanced at the three people behind him again

Jin Niang agreed loudly. Seeing Han Gang looking over, the three of them also bowed, agreed in unison, and followed Jin Niang to the small kitchen in front.

The biological mother also has to be called aunt, which makes Han Gang feel a little sorry. It's really hard to get used to, and I feel sorry for Zhou Nan, Su Xin and Yun Niang.

It's just that it is necessary to distinguish clearly, but it is tantamount to forcibly drawing a chasm in the concubine, which is even worse for the children. Now Wang Yi regards it as his own, which is already commendable.

Han Gang shook his head, took four square steps, and walked slowly back to the room.

In my heart, I know that there are not many days left for such idle days.