| 摘要 |
PURPOSE:To realize mass production without requiring a technique of a high level, and also to make a titled sand-glass small-sized and light, by superposing a transparent or opaque plate on the outside of both surfaces of an intermediate plate having a guitar-shaped hole, and constituting so that particles are stored in the guitar-shaped space formed inside. CONSTITUTION:When transparent, semi-transparent or opaque side plates 2, 3 are superposed from the outside so as to close up a guitar-shaped hole in an intermediate plate 1 to form a plane guitar-shaped space inside, therefore, particles 4 are stored in this space, and a plywood type sand-glass is prepared. When the sand-glass constituted in this way is placed vertically, the particles drop through a path which is narrowed thinly toward the lower small chamber from the upper small chamber, and it functions as a sand-glass. According to this constitution, a sand-glass having high accuracy can be obtained in a short time by a very simple and light technique to superpose the plate and to put the particles in and furthermore superpose the plate. |
