抄録
Trees pump up water to the high leaves with narrow tubes. It was found that we could also pump up water to high places with narrow tubes without large energy loss as follows. (1)Narrow tubes less than 2.5mm inside diameter were used to maintain a column of water by surface tension. (2)Water columns total length of which was less than 10m were pumped up by decompressing the upper part of narrow tube. (3)The speed of columns of water had to be maintained less than several mm per second, otherwise columns of water were divided into a lot of drops of water.(4)To achieve the purpose, an airtight container filled with water was used, from the bottom of which water was drained drop by drop, and the top of which the upper part of narrow tube was connected. (5) An orifice was set at the narrow tube exit to prevent increasing velocity of water column when it flew into a collection device. (6)When orifices were set in a narrow tube at the interval that is shorter than the length of one column of water, plural columns of water could be pumped up continuously, and plural narrow tubes could be used with one airtight container.
