Tsukushi makes a sharpening, 1 foot long, 1 inch wide, and 6 sharpeners can be combined into a circle. The sharpening should always be as sharp as new, even if the blade is worn out, there is no defect and deformation. Zhishi made a killing arrow, which is a kind of arrow used for hunting, the widest part of the arrow is 1 inch long, the collar is 10 inches long, and it weighs 3 锾 (huán).

Ge is 2 inches wide, and the length of the inner is twice as wide as the width, the length of the Hu is 3 times the width, and the length of the aid is 4 times the width. If the aid is too upward, it will not be easy to peck, if the aid is too downward, it will not be able to cut the wound, if the inside is too long, it will be easy to break the aid, and if the inside is too short, the pecking will not be fast, so the angle between the aid and Hu will be slightly outward. Ge weight 3 锊 (lüè). The halberd is 1 and a half inches wide, the length of the inner is 3 times the width, the length of the Hu is 4 times the width, the length of the aid is 5 times the width, the thorn, the Hu and the aid, the inner vertical and horizontal intersect at right angles, and the Hu, the aid, the inner and the thorn weigh a total of three gongs.

Momo makes a sword. The width of the sword is two and a half inches, and the width of each side is half the width. The width of the sword is used as the girth of the hilt, and the length of the hilt is more than twice the girth. In the middle part of the hilt, the sword wrapped with a rope is set. The width of the sword is divided into 3 equal parts, and the diameter of the head is removed by removing 1 equal division, so that the circumference of the sword head is made according to these, and the sword head is an ornament inlaid at the top of the hilt.

The length of the sword is 5 times the length of the stem, and it weighs 9 gongs, which is called the upper system, and only the warriors of the best stature can use it; The length of the sword is four times the length of the hilt, and it weighs 7 gongs, and is called the medium system, and it is used by warriors of medium stature; The length of the sword is 3 times the length of the hilt, and it weighs 5 gongs, which is called the lower system, and it is used by warriors of inferior stature.

凫 (fú) made a clock. The two corners on both sides of the bell are called milling (xiǎn), the end between the two mills is called yu, the part that beats the drum on the top is called the drum, the part above the drum is called the cymbal, the part on the top of the bell is called the dance, the handle on the dance is called the yong, and the plane at the upper end of the yong is called the heng. The ring-shaped bell hanging set in the lower part of the Yong is called the spiral, and the button-like spiral worm that runs through the spin is called the stem.

The bell belt is called 篆 (zhuàn), and the stalactites protruding between the seals are called pieces, and the pieces are also called scenes. The place where the light is slightly concave and used to prepare for percussion is called a tunnel. Divide the length of milling into 10 equal parts, and remove 2 equal parts to get the length of the cymbal. Use the length of the cymbal as the distance between the two mills, and then remove 2 points to get the distance between the two drums.

Use the distance between the two drums as the length of the dance, and then remove 2 points to get the width of the dance. Use the length of the cymbal as the length of the Yong, and the length of the Yong as the circumference of the large end of the Yong. Divide the girth of the big end of the Yong into 3 equal parts, and remove 1 equal part is the girth of the balance. Divide the length of the Yong into 3 equal parts, 2 equal parts on the top, and one equal part on the bottom, and set the rotation on the occasion of the upper and lower sections.

There is some reason why the vibration caused by the thickness or thinness of the bell, the sound of the bell is clear or turbid, and the width or narrowness of the bell is due to the basis of the bell. If the bell is too thick, it will not be able to make a sound like a stone, the sound made by the bell body will be spread if it is too thin, the sound made by the bell mouth will be too urgent, the sound made by the bell mouth too narrow will be depressed and difficult to transmit, and the sound made by the bell will not be correct if it is too long.

Therefore, the bell divides the distance between the two drums by 10 equal parts, and uses its 1 equal part as the thickness of the bell body. The snare drum divides the distance between the two cymbals into 10 equal parts, and uses 1 equal part as the thickness of the bell. The bell is large and short, and the sound it emits is rapid and short. The bell is small and long, and the sound it emits is soothing and long-lasting. To make a tunnel for striking, divide the thickness of the bell body into 6 equal parts, and use 1 equal part to make a circle as the depth of the tunnel depression.

Chestnut makes a measuring device. First, repeatedly smelt copper and tin to make it pure, there are no more impurities that can be lost, no more impurities can be lost, and then weighed, weighed and immersed in water to measure the volume size, and then cast the measuring instrument after the volume is determined. The cast measuring vessel is 鬴 (fǔ), which is 1 foot deep and can hold 1 cubic foot, while the measuring vessel mouth is round, and its volume is 1 鬴. The buttocks are 1 inch deep, and the volume of the buttocks is 1 bean.

The protruding ears on both sides of the manuscript are 3 inches deep, and the volume of the ears is 1 liter. The weight of the mustache is 1 jun, and the sound produced by striking the mustache is in line with the Huang Zhonggong. Use the lid to flatten the rice millet contained in the rice millet so that it does not fall off. The inscription on the stalk says: The virtuous king wanted to establish a law of measurement for the people, and thus made the scarf, and thus attained the highest credit; A good measuring instrument has been formed to inform the countries of the Quartet; Always enlighten your children and grandchildren to use this measuring instrument as a guideline.

Observing the state of smelting and casting metal, the black and turbid gas of smelted copper and tin is exhausted, and then the yellow and white gas will appear; The yellow-white gas is gone, and then the blue-white gas appears; The blue and white gas is gone, and then the cyan gas will appear, which can then be used to cast utensils.

The letter man makes the armor. The upper and lower parts of the rhinoceros leather armor are made of seven pieces of armor, the top and bottom of the armor made of 兕 (sì) leather are made of six pieces of armor, and the top and bottom of the armor are made of five pieces of solid armor made of two rhino or 兕 skins. Rhinoceros leather armor lasts for 100 years, leather armor lasts 200 years, and strong armor made of two rhinoceros or rhinoceros skins can last for 300 years.

In order to make armor, the shape of the human body must be measured first, and then the nail piece must be cut. Weigh the upper body and lower body of the armor, and the weight requirements are the same. Use the length of the armor as the waist circumference. All the armor, the leather forging is not solid, and the excessive forging causes damage to the texture of the leather, which will make the armor tortuous but not strong.

The method of observing the nail coat is to see the hole drilled on the nail piece for the wire rope to connect the nail piece, and the hole should be small; Look at the inside of the nail piece, it should be scraped flat and light; Look at the seams of the armor, the top and bottom should be very straight; Put it in a strap and keep it small; When held up and unfolded, it should appear magnanimous; When worn on the body, the nail pieces should not be cut against each other.

Seeing that the holes in the nail plate are very small, you know that the armor is very strong; When you see the inside of the armor is flat and light, you know that the material of the armor is good; When you see that the seams on the armor are very straight, you know that the workmanship is good; If the size of the bag is small, you know that the sewing is exquisite; If it is raised and unfolded, it must be very glorious; When worn on the body, the nail pieces do not grind each other, and it is very convenient to move.