01 A hydrometer scale on which the zero point corresponds to sp. gr. 1.00, and the 30°-point to sp. gr. 0.85. From these points the scale is e…
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A hydrometer scale on which the zero point corresponds to sp. gr. 1.00, and the 30°-point to sp. gr. 0.85. From these points the scale is extended both ways, all the degrees being of equal length.