| 摘要 |
A cryogenic cooler, e.g. for medical specimen or other samples or materials to be brought to temperatures below 0 DEG C., comprises a stable and precise cryogenic device in which a liquefied gas is continuously vaporized in the absence of a free surface of a bath of the liquid, the vessel being a Dewar receptacle open to the atmosphere whereby a slight atmospheric pressure excludes moisture-carrying air and thus prevents ice deposits in the vessel or on the sample. |
