| 摘要 |
The present invention (device) relates to a medium-pressure double boiler, in which a magnet is inserted into a starting point of the edge of a body for a pressure of 0.3 kg, and a lid is formed of a metal reacting with the magnet to make pressure, thereby manufacturing the double boiler for extracting an extract, wherein, in order to inform the in-use time or the time of completion, a groove is formed in the center of the lid and water is put into the groove, and the scale is marked according to the flying amount of steam (vapor), thereby informing the time. |
