In the open space, the sound of banging can be heard endlessly.

Bi Fang sat on the pony, inserted a wooden wedge as long as his palm into the groove, and struck it with a stone hammer as long as his forearm, smashing it into it.

As the wooden strips are added up and fixed piece by piece, the shape of the sled has basically taken shape. Just by looking at it, you can tell that this will be a very functional dog sled.

In the forest not far away, three fools were sitting in a row, lying on the ground and whimpering sadly. They watched the sled taking shape, but did not dare to get close. In the dark, they felt a great terror, and

This terror is about to come to the head of the dog who has been completely crazy this week.

Bi Fang didn't know why those three silly dogs were sitting there staring at him so early in the morning, but this did not affect his work. While cleaning his teeth with a chewing stick in his mouth, he knocked down the stone hammer hard and continued.

Hands on work.

Although a little rough, and the wooden wedges are not entirely true to size, they still hold the two long curved pieces of wood firmly together, and they will never separate unless the wooden wedges are pulled out, or the material structure breaks.

It's just that the size is a little off. The width is just right, but the length is a little short and a little loose. Bifang inserted another piece of wood as a cushion, and then applied resin glue.

Resin glue is a very effective waterproof glue. It is mainly extracted from pine trees, such as pine and spruce. They happen to be tree species that exist in cold areas, and there are many in the forest.

"The resin will flow out of 'wounds' on the trunk, or be stored in protrusions under the bark, so you can just remove the resin with a stick."

Bi Fang explained it once when he went to cut the resin yesterday, but in order to avoid uninformed viewers, he repeated it again.

The live broadcast viewers come from all over the country. Due to the time difference and Bi Fang's current biological clock disorder, some viewers will definitely miss some of the content.

Judging from the twelve-hour dividing line, only 10% of the overlapping viewers in the live broadcast room, that is, the remaining 90% of the people, may not have heard the previous content and can only understand it through barrages.

It's okay for big events and can be replayed sometimes, but it's not necessarily the case for some small knowledge points. Bi Fang can also use them to kill time and increase the fun.

Coincidentally, the resin glue collected and made the day before yesterday was almost used up, so I made a new batch.

"We put the collected resin in a container and put it on the fire."

In the small fire pit, the resin glue is slowly being heated.

"When the resin starts to melt, you will smell a strong pine oil smell. This is normal, don't worry. It should be noted that the heating temperature should not be too high to avoid boiling the resin, which will weaken the resin.

The adhesiveness of glue.”

"Also make sure you have a lid on hand, because resin can easily catch fire. Once it burns, cover the container with a lid immediately to prevent the resin from burning. If... Huo!"

Just as Bi Fang was about to say something, he saw from the corner of his eye that the firewood crackled open, flying sparks fell into the container, and then a ball of flame burst out from the wooden bowl. Fortunately, he had quick eyesight and quick hands, and he closed the lid as soon as it started burning, otherwise

I almost burned my eyebrows.

[Good guy, if you tell me to burn, I will burn it]

【It's too hot, it's burning】

【Be careful】

After closing the wooden lid to block out oxygen for a minute, Bi Fang opened it again and continued.

"Where did I just talk about it? Oh, if you have a lot of resin and you also need to get very pure resin glue, then you can filter the liquid resin glue. You have to do it quickly, otherwise the resin glue may solidify."

"After the resin cools, it will return to its previous natural state. Therefore, in order to make the resin glue harder and stronger, a 'tempering agent' needs to be added to it."

"Generally speaking, there are three kinds of additive substances that are easily obtained in nature. Each of these three substances has its own advantages. Crushed charcoal is the most commonly used additive because it is the easiest to obtain. In most cases, adding charcoal can

, although this resin is more brittle after drying."

"The second is beeswax. Adding beeswax can make the resin glue more flexible, but this resin glue is not strong enough, feels greasier, and will be softer after forming."

"The last thing is feces, which must be the feces of herbivorous animals, such as rabbits and deer. Their dried feces are the best additives. This resin glue is the strongest and most durable, but it is not hygienic enough, so do not use it for sticking.

Cups and other utensils.”

What Bi Fang chose was to add charcoal, add crushed charcoal to the constantly stirring resin, and then stir thoroughly.

【Good guy, even feces is okay?】

[A bit outrageous]

[I guess, it’s mixed fiber, plus some other special ingredients, right?]

"It is difficult to determine how much blending agent should be added to make resin glue. Generally, it is added in a ratio of 1:10 first, and then a little is taken out to shape. If it is already hard after shaping, it is enough."

"If it is still relatively soft and sticky, continue to add the tempering agent. After adding the tempering agent, the resin glue must be used immediately when it is hot, because it will set its shape once it cools."

"It's best to divide the resin glue into multiple parts and only take a part of it each time you use it, because the more times the resin glue is reheated, the weaker it becomes."

"The method of dividing it into small portions is also very simple. Just stick a little on a stick, then put it in water to cool and peel off. Of course, in the Arctic, air cooling is enough."

Bi Fang rolled out the sticky resin glue and applied it directly to the joints of the sled. After scraping it evenly with bark, he immediately wrapped it with a long rope rubbed with water-soaked bark and reinforced it three times.

"I originally wanted to use cortical glue, which is the best glue for bonding organic materials. Although it also has disadvantages, it will stretch when exposed to water, cannot be heated, and cannot stick to materials such as stone, but it is not suitable for wood.

Said, the effect is indeed good, but it’s just the leather glue..."

Bi Fang scratched his head and spread his hands: "As you can tell from the name, this thing is made of rawhide. I don't have any rawhide on my hands anymore, only a piece of cooked musk oxhide, and even if it is still rawhide, I can't bear to part with mine."

Plush sleeping bag.”

[No, actually Fang Shen, you have rawhide, and there are a lot of them]

"Um?"

Bi Fang was stunned. He had rawhide?

[Lao Fang, look at your left hand side and you will understand]

Bi Fang looked to his left in confusion, and happened to see the three idiots sitting in a row, right next to each other.

For some reason, when they saw Bifang's gaze, the three idiots all tucked their tails under their buttocks, sticking out their tongues in a flattering manner.

...

[Damn, you have such a big idea!]

[Three Idiots: Where did we offend you? 】

[If the wall doesn’t agree, then I will obey you]

"Ahem, after all, they still have to pull the sled, so let's let them go."
Chapter completed!