The "Ao Bao" on the ridge was a parting gift from Sun Yi to the Manchurian soldiers, inspired by the tricks of the Eight Roads to deal with the devils, but the high-tech technology used was thrown out of the Eight Roads for 108,000 miles.

In the center of the stone "Ao Bao" were five or six explosive packets, one of which had an initiator tube inserted into it,

The detonator is connected to a zinc-oxygen battery by four contact switches connected in parallel, any of which can detonate the "Ao Bao".

In the past, the allied forces' electric three-eyed guns used the open-circuit high-voltage excitation spark technology of battery and coil, and the initiator used the high-current resistance wire heating technology.

The structure of the initiator is very simple. Two coarse enameled copper wires screwed together, with a short section of very fine iron wire bridging at the end. The wire is wrapped in a small lump of potassium chlorate and charcoal, and a layer of rosin is applied outside. The entire detonator is set with a hollow reed tube.

When the detonator is energized, the resistance of the thin iron wire is much greater than that of the thick copper wire, and the thin iron wire heats up, detonating the dressing outside the iron wire.

The key process of the whole detonator is that small section of very thin wire, which was previously difficult to pull out due to the low quality of the Allied iron. However, the pure iron obtained by electrolysis is very soft, and a small piece of pure iron can easily pull out the bridge wire of many detonators.

With the use of the detonator, the detonating contacts for which the mines are arranged become flexible. The so-called detonation contact is something similar to the nature of a circuit switch, and the connected circuit is regarded as a contact. The contacts can be connected in parallel, and any one of the contacts can be turned on to explode the mine. The contacts can also be connected in series, and will only be detonated when all contacts are connected at the same time, which should be used for large groups of people who specialize in blowing up the enemy.

In the past, the coalition used iron cans of copper sulfate batteries for disposable mines, but Sun Yi thought it was too wasteful, and the low-cost zinc-air battery was Sun Yi's proud work.

Zinc, which was called "Japanese lead" by the people of the Ming Dynasty, was a cheap metal after the hardware of "gold, silver, copper, iron, and tin" for the people of the Ming Dynasty.

It was easy for the coalition forces to get some zinc ingots from the copper shop in Dabansheng. Craftsmen process zinc ingots into zinc foil by casting.

Sun Yi used zinc foil as the anode, graphite as the cathode, and low-resistance carbon as the filler to make a tall zinc-air battery.

The specific production method is also very simple. A small crockpot is used as the shell, lined with a circle of zinc foil against the inner wall, and lined with a layer of cotton cloth.

Put some low-resistance charcoal compacting pad in the crockpot, insert the graphite electrode in the center of the crockpot, and then sprinkle charcoal evenly around the graphite electrode, and press the charcoal around the graphite electrode, the tighter the compression, the better the performance of the battery. Pour a little concentrated salt water over the charcoal to moisten it. Repeat the previous two steps until the crockpot is filled with charcoal.

Made, done.

The principle of zinc-air battery is the reaction of zinc foil with oxygen in the charcoal hole, and the voltage can reach 1.4 volts. However, Sun Yi's zinc-air battery has a small capacity and short life, and it will fail even if it does not take a few weeks after it is done, but it is suitable for one-time mine ignition.

The low-resistance carbon firing process in the key to Sun Yi's zinc-air battery technology is completely different from the charcoal used to make black powder. The latter is to heat the firewood in a completely isolated air and make it gradually charred; The production of the former is relatively complicated: make the firewood burn in an oxygen-sufficient environment first, and then make it carbonized in an oxygen-deficient environment, and give it sufficient oxygen to burn again when the firewood is just carbonized, at this time the temperature of charcoal burning is extremely high, and the microstructure of charcoal is graphitized at high temperature, so it has good conductivity. The charcoal obtained in this way is also known as white charcoal.

The people would burn the charcoal, but Sun Yi did not use the method of the people who spent dozens of days smelting charcoal in the kiln.

Sun Yi uses a small charcoal stove with bottom ventilation, first ventilates the red willow wood to fully burn, closes the damper when the flame is the most bright and stable, makes the flame smaller, and the flame gradually extinguishes after a few minutes, and the carbonization is gradually completed, then quickly open the damper, blow the air for five to ten minutes, and then seal the charcoal stove for ten minutes, and then get low-resistance charcoal.

Low-resistance charcoal can theoretically be washed and dried for reuse after the battery fails, but in practice there is no need for this, it is simpler to re-burn, and it can be used for a long time after burning once.

For Sun Yi, the biggest advantage of zinc-air batteries is their low cost. The second is that the life span is short, and if you forget to clear the mine after the battle, the mine will automatically fail.

……

After Yang Ritian led the main force of the three battalions to quickly retreat from the ridge, Sun Yi led people to lay mines behind the team.

Due to the purpose of teaching the mine-laying belt this time, in addition to the 10,000 opponents of the third battalion, there were also a few people from the second and half Niu Guangtian belts, and the escort of Li Guang, the commander of the third battalion, and Sun Yi.

Everyone first worked together to arrange a provocative "Ao Bao" mine, and then Sun Yi explained the basic method of laying mines.

The explosives pack can be used to push the stone directly like the "Ao Bao" mine, or it can be packed into a container such as a crockpot, a wooden box, or even a cloth tape with the gravel.

Mines buried in the ground are the most hidden, but when they explode, the fragments are upwards and the angle of destruction is relatively small. With the help of a large stone on the side, a directional mine can be formed. If you hang the explosives pack on a tree, you can form an all-directional mine.

Use two copper wires, crossed, the top one slightly upturned, and cover the leaves with floating soil is a stepping contact. The pedal-type contacts can be placed together with the explosives pack or can be distanced. For example, the contact point is in front and the mine is in the back, which is suitable for bombing the enemy on the march.

Bend two copper wires into a disc, stack them horizontally, sandwich a leaf in the middle, press a stone on it, and tie a thin wire to the petiole to block the grass is the mixing cable contact.

One copper wire is bent into a spiral tube, and the other threads into the tube to form a contact contact, which is triggered by a slight touch.

Various contacts can also be combined with other mechanisms, such as hunting clips and slings in the field, and door shafts and door bars in villages; And so on and so forth.

Of all these contacts, it is best to use manual actuation, and if there is no suitable safe place to conceal it nearby, the conductor length can be extended with the help of one or several relays.

Finally, and most importantly, condoms. Condoms can only be removed after being ordered and confirmed twice.

After Sun Yi explained, everyone played freely, and each person sent a bag of explosives to find a suitable place to lay mines.

Everyone has their own powers.

The sullen egg was stunned for a long time, and finally found a white cloth strap and threw it in, and put the explosive bag in the most conspicuous place on the grass.

The sullen man said: "When the thief sees the bulging white pocket, he must pick it up and look at it, make a contact point that rings at the touch of it, and keep it full of bombs." ”

In the end, the stuffy Budailei won the first place.

Sun and everyone installed the battery and contacts of the thunder point, and lowered the cliff with the help of a rope.