Apparatus for depth monitoring

Details Apparatus for depth monitoring Apparatus for depth monitoring

1996-12-13

1998-09-15

Melius, Terry Lee

Earth working

Automatic power control

Land leveller type

37DIG20, E02F 376

Patent

active

058066047

ABSTRACT:
The invention relates to apparatus for monitoring the depth of a layer of a filter media such as sand in a filter such as a slow sand filter, comprising a leveller, in the embodiment a box leveller with a trailing smoothing device, wheel or roller, adapted to level the surface of the layer of sand and a laser device mounted on a mount which is movable substantially vertically and has a calibration means in the form of a visual calibration scale whereby to determine depth of filter media.

REFERENCES:
patent: 3494426 (1970-02-01), Studebaker
patent: 3887012 (1975-06-01), Scholl et al.
patent: 4299290 (1981-11-01), Nunes, Jr.
patent: 4807131 (1989-02-01), Clegg

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