To guarantee density uniformity of perlite rock, an extremely simple device for ascertaining the mass and volume of perlite rock directly at the rock deposit and determining the average density of the rock by using a nomogram was developed on the basis of Archimedes principle. The basic physical and mechanical properties closely correlated with the average density of rock are determined by a computational method using derived formulas. These studies make it possible to introduce the concept of grade and to stockpile the mined rock by density directly at the quarry.

中文翻译：

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确定珍珠岩性质的快速方法

为了保证珍珠岩的密度均匀性，根据阿基米德原理，开发了一种非常简单的装置，可直接在岩石矿床确定珍珠岩的质量和体积，并通过列线图确定岩石的平均密度。与岩石的平均密度紧密相关的基本物理和机械性质是通过使用导出公式的计算方法确定的。这些研究使得有可能引入品位的概念，并直接在采石场以密度存储开采的岩石。