Teaching sin and cosine instrument

Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

REFERENCES:
patent: 3413 (1844-01-01), Thompson
patent: 102034 (1870-04-01), Ockerlund
patent: 115318 (1871-05-01), Hickman
patent: 662977 (1900-12-01), Schmelz
patent: 771663 (1904-10-01), Peroy
patent: 964246 (1910-07-01), Hagan, Sr.
patent: 1117805 (1914-11-01), De L'Leau
patent: 1379124 (1921-05-01), Read
patent: 1409342 (1922-03-01), Henrichs
patent: 1500427 (1924-07-01), Valkenburgh
patent: 1691279 (1928-11-01), Gates
patent: 1955392 (1934-04-01), Shimberg
patent: 1999105 (1935-04-01), Milla
patent: 2160820 (1939-06-01), Bensen
patent: 2505149 (1950-04-01), Schoenberg
patent: 2682367 (1954-06-01), Friesen
patent: 2990620 (1961-07-01), Tagliere
patent: 3345752 (1967-10-01), Gabriel

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Teaching sin and cosine instrument does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Teaching sin and cosine instrument, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Teaching sin and cosine instrument will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3408034

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.