Measuring and testing – Borehole or drilling – Downhole test
Patent
1987-12-04
1989-05-16
Levy, Stewart J.
Measuring and testing
Borehole or drilling
Downhole test
73 38, E21B 4700
Patent
active
048298174
ABSTRACT:
An improved method and apparatus for taking soil percolation tests. In the preferred embodiment the apparatus comprises a threaded shaft; a plurality of marking discs that can be selectively positoned along the shaft at predetermined gradations; a positioning brace that overlies the shaft for securing the shaft in vertical alignment; a mounting disc affixed near a base end of the shaft that becomes flush with the soil when the shaft is inserted into a percolation test hole; and a receiving disc near a top end of the shaft for receiving the positioning brace as it straddles the test hole. In using the device, the person administering the test adjusts the marking discs along the shaft to predetermined gradations; secures the device within a percolation test hole; fills the hole with water; observes from a remote distance the descent of the column of water within the hole; observes the formation of a meniscus around a first marking disc below which the column of water has descended; and records the time variable when a wave appears on the surface of the water resulting from the snap of the meniscus as the column of water descends further below the first and subsequent marking discs.
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Holland Donald S.
Levy Stewart J.
O'Shea Kevin D.
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