Soil Mechanics and Foundation
Hydrometer readings are corrected for:

Meniscus correction
Dispersing agent correction
Temperature correction
Temperature, meniscus and dispersing agent corrections

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Soil Mechanics and Foundation
If the material of the base of the Casagrande liquid limit device on which the cup containing soil paste drops is softer than the standard hard rubber, then

The liquid limit of soil may decrease
The liquid limit of soil always increases
The liquid limit of soil always decreases
The liquid limit of soil may increase

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