e matching hose to the gas tank, and then unscrew the valves at both ends.” After speaking, he demonstrated the operation process of deflation and inflation in public. “How many cylinders do you need to fill a reconnaissance balloon?” Margaret quickly grasped the point. The question of “five or six bottles” made Roland a little embarrassed, “no more than seven bottles at most.” The main reason is that the concentration of dilute sulfuric acid used to generate hydrogen in the bottle is difficult to control. Distill and purify the sulfuric acid to 98% before mixing. Water dilution was too wasteful of precious labor in the laboratory, so it had to be dropped. “This kind of alchemical gas is very expensive?” “It’s true. It is difficult to store, and it is full of danger. I mean, if you accidentally operate it,” Roland coughed twice, “so the gas tank can only be stored for one year, and it cannot be knocked. It may cause unpredictable and serious consequences.” He paused, “Although the price is a bit expensive, don’t worry. The first batch of gas storage tanks will be free of charge from Border Town when the balloon is first purchased. Yes, you can also get an extra sky camouflage detective suit.”. After the accompanying caravan left, Roland let out a long sigh. Finally the vault is full again. A total of eight steam engines were delivered to the three chambers of commerce, of which three were produced in the No. 2 factory assisted by the Crescent Bay Chamber of Commerce. I have to say that these craftsmen from the fjord are much more talented and learning than the miners in the small town. With Blacksmith, after mastering the operation of the machine tool, the qualified rate of finished products has risen sharply. Maybe in two months, the production capacity of No. 2 Plant will be able to catch up with No. 1 Plant. Fortunately, according to the signed contract, all income from the sale of these machines belongs to Roland. In addition, he also got a new hydrogen balloon purchase order from the Crescent Bay Caravan.