Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1994-08-03
1996-01-16
Wirthlin, Alvin
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33373, G01C 906
Patent
active
054837480
ABSTRACT:
A sound indicative leveling apparatus comprising an arcuate leveling tube having free and sealed ends extended upwards; a coupling mechanism for securing an external object to be leveled above or below the leveling tube; leveling circuitry further comprising a power source for supplying electrical energy; oscillation circuitry coupled to the power source and adapted to be keyed by an oscillation activation signal for generating speaker activation signals at given frequencies; a speaker coupled to the oscillation circuitry for generating audible tones upon receipt of the speaker activation signals; a switch mechanism disposed along the leveling tube and extended therein and coupled between the oscillator circuitry and the power source; and liquid conductive material disposed within the leveling tube of an amount to electrically engage the switch mechanism based upon leveling tube orientation and thereby generate an oscillator activation signal.
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Groves Lyle W.
Groves Martha R.
Hamtil John D.
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