| 摘要 |
<p>METHOD AND APPARATUS FOR MEASURING A CHANGE IN SURFACE LEVEL OF A FLUID (D#74,619-F) A sensitive J-tube employs an indicating liquid in the U-tube portion. Such indicating liquid is immiscible with the liquid thereabove. The longer leg of the J-tube has a larger cross-section area portion which may contain the above liquid when the J-tube has been immersed therein. There is valve means in order to connect both legs of the Utube portion at locations that are above the indicating liquid, into communication with the above liquid the level of which is to be measured, and the valve means may isolate the longer leg of the J-tube during a level change measurement. -I-</p> |
