| 摘要 |
PURPOSE:To elongate the using period of a dissolving plate by providing plural pouring gates to the dissolving plate made of platinum-base metal. CONSTITUTION:Plural, such as three or five, pouring gates 3 are provided to the dissolving plate 4 made of platinum or platinum alloy which is used for making samples for analyzing a lens or glass, etc. When one pouring notch is deteriorated by partly melting, boring, deforming, or cracking, another pouring gate is able to be used. As a result, the dissolving plate of long service life is obtained. |
