Temperature variations have a significant effect on hydrometer readings taken during the size analysis of a sediment. A study was made to establish an empirical relation between temperature and the hydrometer readings when temperature was the only known variable. Gravitational attraction, atmospheric pressure, and the concentration of dispersant were considered constant. A temperature correction chart has been prepared which can be used in connection with a soft colloids hydrometer so calibrated that at zero suspended load and temperature of 67 degrees F., it would read zero. The concentration of dispersant must also be 2.54 g of sodium hexametaphosphate per liter of water.

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