Trigonometric slide rule

A mechanical apparatus for solving trigonometric problems comprising:

• a support member having a front surface and top and bottom edges, said surface having indicia designating an origin point, said front surface having a printed indicia designating a linear base scale, said base scale starting at said origin point and being substantially parallel to said top and bottom edges and capable of designating predetermined unit distances from said origin point;
• said front surface having indicia designating a linear angle scale said angle scale, being nearly perpendicular to said base scale and capable of designating an angle defined by said base scale and another line going through said origin point;
• a base height scale comprising a flat strip of substantially transparent material having a sliding means at each end, said sliding means capable of keeping said base scale in contact with said support member while allowing said base height scale to slide along said top and bottom edges of said support member, said base height scale having indicia markings to designate predetermined unit distances from said linear base scale, said indicia markings being perpendicular to said linear base scale;
• a linear hypotenuse scale comprising a flat strip of substantially transparent material, said strip attached to said support member substantially near said origin point by a pivoting means, said pivoting means capable of allowing said linear hypotenuse scale to slide along said support surface in a movement centered on said origin point so as to form angles with said linear base scale, said angles capable of being measured by said linear angle scale, said linear hypontenuse scale having indicia to designate predetermined unit distances from said origin point.