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"Suppose a to be a gravel hill, and b a strata of clay or rock, impervious to water. The fluid percolating through the gravel would reach the impervious strata, along which it would run until it found an outlet at c at the foot of the hill, where a spring would be formed." — Wells, 1857

Gravel Hill

"Suppose a to be a gravel hill, and b a strata of clay or rock, impervious to water. The fluid percolating…

A diagram of a 100 ton sand and gravel storage and handling plant. "Capacity of bucket elevator is 40 tons per hour and the belt conveyor 25 tons per hour. The swivel loading spout in combination with the fixed bucket elevator will distribute material over a considerable area." -Meese, 1913

100 Ton Sand and Gravel Storage and Handling Plant

A diagram of a 100 ton sand and gravel storage and handling plant. "Capacity of bucket elevator is 40…

"A sandy stratum, a a, acting as a filter, occupies an inclined position between two other strata impervious to water, such as clay, the water being absorbed by the superficial parts of the strata, as at a a (which may be of very great extent), will penetrate through its whole depth, and, finding no egress below on account of the basin-like form of the stratum, or from its resting at the lower termination upon a compact rock, will accumulate." — Wells, 1857

Sandy Stratum

"A sandy stratum, a a, acting as a filter, occupies an inclined position between two other strata impervious…

A sifter used for gravel.

Gravel Screen

A sifter used for gravel.

A vial with a very small amount of gravel in it, and a cork stopper.

Nearly empty vial

A vial with a very small amount of gravel in it, and a cork stopper.