Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Reexamination Certificate
2005-09-13
2005-09-13
Smith, R. Alexander (Department: 2859)
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
C033S453000, C434S211000
Reexamination Certificate
active
06941667
ABSTRACT:
A device that teaches the relationship between a right triangle, the length of its hypotenuse, the length of its two sides and the trigonometric functions. The device includes a horizontal and vertical ruler attached by a sliding attachment bracket. A circular plate showing 360 degrees (θ) is attached to the horizontal ruler along with a pivoting ruler that can rotate 360 degrees. By sliding the vertical ruler along the horizontal ruler and revolving the pivoting ruler, the height of the vertical ruler (Y) where it intersects the pivoting ruler, the length of the horizontal ruler (X) where it intersects the vertical ruler, and the length of the of the pivoting ruler (R) where it intersects the vertical ruler can be measured. The trigonometric functions can then be calculated and plotted by their relationship with the measured values of X, Y, R and θ.
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Bauldock, Sr. Gerald
Smith R. Alexander
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