The standard weight of one pound has been obtained, and according to previous calculations, this rod is weighed with ten pounds, so that the weight of "one pound" is within 35 pounds. to be accurate to two.

Just now, in order to select a pound of standard weight, we have been given two pounds of standard weight stones.

Next, put these two pounds of standard weight stones on one end of the scale, and weigh another two pounds of stones at the other end. So we get a standard weight of five pounds. (including the standard weighing of the pound)

Put the five catties on one end of the scale, and then weigh a weight of five catties, and you get the standard weight of 10 catties.

Then use the weight of 10 catties to select a 10-pound weighing weight through the balance. The scale of the rod scale was obtained.

Next, Wang Tian asked the leader to lift the rope of the pole scale and hang the small weighing pan on the scale hook. The rod weighs the tail and puts it into the ten catties of straw rope that have just been obtained.

Keep moving the scale until the stem is balanced.

Under the position of the straw rope of the scale is the zero scale mark of this rod scale, which is also called the fixed star.

After confirming the position of the fixing star, use a small saw to make a 0 scale mark one millimeter deep and two centimeters long.

Wang Tian put the standard one-pound scale into the small weighing pan, and moved the scale on the rod scale until the scale rod was balanced, marking the location of the pound.

Next, put the two piles of four catties and five catties of stones into the small weighing pan in turn, and mark the scale marks of four catties, five catties, nine catties and ten catties respectively.

Then pick up the meter ruler you made today and measure it. The data shows that every paragraph is standard. This shows that the making of the rod scale is standard.

Next, the middle weight and the subsequent weight are marked with the same distance.

In order to make a rod scale accurate to "two". Wang Tian insisted on making a one-meter-long rod scale, and the maximum load capacity was only thirty-five catties.

In order to compensate for the lack of maximum load-carrying weight. When making the "two lifts" for the rod scale, Wang Tian leaned the "two lifts" hole position to the side of the weighing plate.

According to the formula, Wang Tian set into the two "two lifts" with a maximum bearing weight of 150 kg and 200 kg, and calculated the distance between the "two lifts" and the hook hole position.

Resistance X Resistance Arm = Power X Power Arm

150X Resistance Arm = 10X70

200X RESISTANCE ARM = 10X70

They are 5 cm and 3.5 cm. There are no problems with either location.

To facilitate the reading, calculate the spacing of the scales for these two weights again:

70/150 = 0.5 cm

70/200 = 0.35 cm

It seems that the 150 kg one is more convenient to operate. He decided to choose the maximum "two lift" weight of 150 catties.

Next, you need to weigh 35 catties with a balance, which is more accurate than weighing the scale itself, because the tray of the balance is only that large. After Wang Tian weighed a weight of 5 catties again, he got the standard "two mention" weight of 35 catties in two times.

Next, follow the same method as before, find the "second lift" position, and the starting position of the standard weight of 35 catties.

Drill the "two mention" holes, mark and depict the starting position of 35 catties. Next, use the balance to weigh several piles of 5 catties and 10 catties of stones as weights to depict the different weight positions of the "two mention".

After carving out the weight positions of 40, 50, 55, 60, and 70 catties, Wang Tian asked the leader to put down the rod scale.

I have to say that the physique and strength of primitive people are strong, and the leader has been lifting it for so long, and his hands are still steady.

And the tribesmen in the audience didn't know what Wang Tian was doing? In the eyes of everyone, Wang Tian just put a pile of stones on it, took it down again, and put it back on it again.

I couldn't understand Wang Tian, but everyone ate happily. To achieve one bowl per person, you can only wait until after tomorrow.

But this did not affect the joy of everyone, the three large stone pots worked in turns, and everyone did not wait for themselves to eat enough before handing the bowl to the next person, but after each person drank a bowl, the pottery bowl circulated among the people.

In an instant, Wang Tian suddenly had an inexplicable emotion. He suddenly remembered that internet allusion to drinking soup in heaven and hell.

Compared to future generations, the present society is undoubtedly hell. But the satisfied expressions on everyone's faces, the mentality of thinking about each other, are undoubtedly in heaven.

And in the afterlife, if two people are stranded on a desert island, there will be a fight. If it's three people, it's a three-country killing.

Now Wang Tian's team, excluding minors, also has a full 87 adults.

Ling'er handed Wang Tian a bowl of venison soup, and deliberately emphasized that the bowl was cleaned. Through so many days of getting along, she has gradually understood Wang Tian's habits.

For example, you have to brush your teeth and rinse your mouth every day on a fun day, and wash your feet when you sleep at night. When he is not doing things, Wang Tian's body is clean.

These habits seemed to have affected her as well, and Wang Tian found that she and Ling'er were the cleanest two people in the tribe.

The fish soup without salt always felt that it smelled fishy. For the venison soup that Ling'er called, he smiled kindly and said thank you.

After eating, Wang Tian completed the final production of the rod scale, the weight of "one mention", he marked all the weights to two, "two mention" marked to catty, and configured a large basket for "two mention" as a weighing pan.

Weigh the two weighing pans. In the future, when using the "two mention", the weight weighed will have to be subtracted from the extra weight of the large basket. Or add a sub-weight that is equal to the extra weight.

After the scale rod was made, Wang Tian found a bunch of graphite particles that he used as a paintbrush. The stone is smashed into fine particles, and a clay bowl is brought in, which is continuously ground into a very fine powder for later use.

Find a few broadleaves, put in hydrated lime, and use a wooden stick to make some lime water. Wipe the rod scale with animal skin dipped in lime water, which is the only anti-corrosion and moth-proof material that Wang Tian can get now.

After a few wipings, wipe the surface with water with bark. Then the graphite powder is evenly applied to the surface of the scale bar.

Next, the animal skin is rubbed repeatedly, allowing the black pigment to gradually penetrate into the wood grain. Finally in the scale groove of the rod scale. Fill with hydrated lime slurry.

The rod scale is made, the black scale rod, the white scale mark, except that the head and tail of the scale are not covered with iron sheet protection, the appearance is no different from the rod scale of later generations.

In the end, you will get two weighing pans, as well as a spare 10-pound weighing scale. Use the remaining scales to make the corresponding weights. Wear a straw rope and mark it clearly as a backup.

When it is damaged in the future, it can be remade and used according to the weight of the bottom left.

In the thousands of years of later generations, the rod scale has been the most important weighing instrument, its production process as many as more than 20 processes, Wang Tian made this one, is undoubtedly rough. But it has been able to meet the needs of the tribe now, and that's fine.

Wang Tian handed over the relevant items, as well as the scales and the rod scales to Wu for safekeeping, and then explained to him in detail how to use the rod scales.

Wu tried to add the 5 fish of about one pound selected by Wang Tian in the small weighing pan one by one, and he found that every time he added a fish, he had to go up a big grid.

With the wisdom of Wu, he quickly figured out how the first and second mentions should be read.

Wang Tian then summoned the Big Four for an enlarged meeting of the Politburo.

The main theme of the conference was the adjustment of production methods.

………………………………………

Two chapters that were updated yesterday found to have major bugs after uploading.

Therefore, it was withdrawn and re-edited, and it has been corrected and uploaded. I'm sorry.

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