Trigonometric teaching aid

Details Trigonometric teaching aid Trigonometric teaching aid

2007-10-09

2007-10-09

Guadalupe-McCall, Yaritza (Department: 2859)

Geometrical instruments

Straight-line light ray type

Multisight line

C033S471000, C033S424000

Reexamination Certificate

active

11309738

ABSTRACT:
A trigonometric teaching aid for providing students with real life applications for the principles of trigonometry includes a transit assembly having a sight tube with cross hairs, a level and an upper protractor pivotally connected to an upper end of a vertical scale, and a base assembly including a lower protractor pivotally connected to a lower end of the scale member. By leveling the transit assembly and measuring the angles of inclinations at the protractors, student using trigonometric formulas, tables and classroom lessons can determine physical measurements of real life objects.

REFERENCES:
patent: 662977 (1900-12-01), Schmelz
patent: 819591 (1906-05-01), Peroy
patent: 1894886 (1933-01-01), Paskowski
patent: 2239229 (1941-04-01), Harris
patent: 2460713 (1949-02-01), Richardson
patent: 5632094 (1997-05-01), Mills
patent: 7188427 (2007-03-01), Johnson
patent: 2005/0166411 (2005-08-01), Scorvo

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