一、装置的制作选一个管壁较厚的U形管,把U形管的管口均用胶塞塞紧,把喷灯的火焰调成小火,然后将U形管的一侧靠近弯曲处放在火焰上加热,待玻璃红软后,U形管中气体膨胀使红软处吹开一个小孔,将小乳和予先准备的细玻璃弯管放在喷灯上加热至红软,然后迅速对接。再把U形管的下部一侧放在尖细的火焰上集中一点加热,待玻 1. Preparation of the device Select a U-shaped tube with a thicker tube wall. Plug the U-tube tube into a small rubber plug. Turn the flame of the torch into a small flame. Then place the U-tube on one side near the bend. Put it on a flame and heat it. After the glass is soft, the gas in the U-tube expands to open a small hole in the red and soft place. The small milk and pre-prepared thin glass elbows are heated on the torch and then heated. Quick docking. Then place the lower side of the U-shaped tube on a thin flame and focus it on heating.