Level indicating devices

Details Level indicating devices Level indicating devices

1978-07-07

1979-08-14

Phillips, Charles E.

Geometrical instruments

Indicator of direction of force traversing natural media

With viewing aid

33366, 250577, G01C 932

Patent

active

041640772

ABSTRACT:
Level indicating devices wherein at least a side portion of a bubble cavity is defined by a reflecting surface having at least a linear cross section lying generally in a plane aligned with or paralleling a light source and a bubble image observer (i.e. person or sensor).

REFERENCES:
patent: 692097 (1902-01-01), Wood
patent: 771803 (1904-10-01), Bishop
patent: 937357 (1909-10-01), Bensen
patent: 1309752 (1918-07-01), Bossler
patent: 1563321 (1925-12-01), Bedortha
patent: 1578786 (1926-03-01), Weston
patent: 1654248 (1927-12-01), Erdmann
patent: 2362872 (1944-11-01), Weagle
patent: 3683196 (1972-08-01), Obenhaus
patent: 3694090 (1972-09-01), Ohyama
patent: 3727242 (1973-04-01), Miller

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