Geometrical instruments – Scriber – Curved line
Patent
1976-05-17
1978-07-11
Aegerter, Richard E.
Geometrical instruments
Scriber
Curved line
33374, G01C 900
Patent
active
040993310
ABSTRACT:
Two extruded aluminum or plastic channel members facing each other and with one confined within the other provide a plumb-rule of basic length and extendable to nearly double that length. The outer channel contains longitudinally spaced spirit level bubbles, a protractor level, and a bulls-eye level bubble all viewable from the exterior through corresponding openings in the back and side walls of the channel, and located free of interference from the inner channel. A counter is incorporated near the upper end of the outer channel and actuated by the extension movement of the inner channel to indicate the extension in increments of distance.
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Anderson Oscar L.
Peterson Wallace W.
Aegerter Richard E.
Shepperd John W.
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