Geometrical instruments – Straightedge type – Rules
Patent
1983-01-14
1984-11-27
Haroian, Harry N.
Geometrical instruments
Straightedge type
Rules
33125R, 33173, G01B 520
Patent
active
044843941
ABSTRACT:
A main accessory and a pair of optional end auxiliaries can be added onto a triangular scale or a ruler to measure the length of a curve. The main accessory can provide a movable pivot for the triangular scale or the ruler. The end auxiliaries can assure the ability of slide of the main accessory on the ruler. The end auxiliaries can also assist the pivoting ability of the triangular scale or the ruler.
Hsia Chih-Hung
Hsia Chih-Yu
LandOfFree
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