| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sandglass which is capable of measuring the lapse of time until all grains fall to the downside, only through a simple operation of vertical inversion that may be most characteristic for sandglasses. <P>SOLUTION: Grains at an upper side of a main body container pass through a communicated hole in a bottleneck portion and fall to the downside. A container having such a capacity as to stagnate the grains for a predetermined time or such a projecting object as to watch a height of dropped grains accumulated for a predetermined time is provided, thereby measuring a plurality of times. <P>COPYRIGHT: (C)2012,JPO&INPIT |
