下面介绍的气体发生装置可以用来代替启普发生器。按图所示,用橡皮管将干燥管的细口与短颈漏斗相连,分别用铁夹和铁圈将它们固定在铁台上。干燥管内用玻璃纤维衬底后,在上面装置固体反应物。干燥管的粗口塞一橡皮塞,它装一支带玻璃活塞的导气管。开启活塞,往漏斗中注入适量的液体反应物(酸), The gas generator described below can be used instead of the Kepler generator. As shown in the figure, use a rubber tube to connect the narrow mouth of the drying tube with the short neck funnel, and fix them on the iron platform with iron clips and iron rings, respectively. After drying the tube with a glass fiber substrate, the solid reactant was placed on top. The crude plug of the drying tube is plugged with a rubber plug and it is fitted with a gas tube with a glass piston. Open the piston and inject an appropriate amount of liquid reactant (acid) into the funnel.