A sedimentation analysis by the hydrometer method (152 H) was conducted with 50 g \left(=M_{s}\right)of oven dried soil. The volume of soil suspension is V=10^{3} cm ^{3}. The hydrometer reading R_{a}=19.50 after a lapse of 60 minutes after the commencement of the test.
Given: C_{m} \text { (meniscus) }=0.52, L \text { (effective) }=14.0 cm , C_{o}(\text { zero correction })=+2.50, G_{s}=2.70 and \mu=0.011 poise.
Calculate the smallest particle size, which would have settled a depth of 14.0 cm and the percentage finer than this size. Temperature of test = 25° C.