Device for dividing an angle into a plurality of smaller equal angles
AssigneeLewis Dynamic Geometry Pty Ltd
InventorJohn Trevor Lewis
Life of this patent
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Abstract
A device for dividing an angle into a plurality of smaller equal angles, comprising: a lower translucent sheet; and an upper translucent sheet positioned over the lower translucent sheet and pivotally connected to the lower translucent sheet at a pivot point for alignment to a vertex of the angle, to enable the upper translucent sheet to rotate relative to the lower translucent sheet; wherein the translucent sheets are marked with visual indicia corresponding to: a straight arm line for alignment on an arm of the angle; and a plurality of progressive loci curves using a T-tool defined by a straight line (EF) of a fixed length between two points (E, F) that is bisected by a bisecting straight line (B) at 90 degrees.
Claims14
A device for dividing an angle into a plurality of smaller equal angles, comprising:
- a lower translucent sheet;
- and
- an upper translucent sheet positioned over the lower translucent sheet and pivotally connected to the lower translucent sheet at a pivot point for alignment to a vertex of the angle, to enable the upper translucent sheet to rotate relative to the lower translucent sheet;
- wherein the translucent sheets are marked with visual indicia corresponding to:
- a straight arm line for alignment on an arm of the angle;
- and
- a plurality of progressive loci curves using a T-tool defined by a straight line (EF) of a fixed length between two points (E, F) that is bisected by a bisecting straight line (B) at 90 degrees, each loci curve is formed by marking a point corresponding to a position at point E of the T-tool when the bisecting straight line (B) passes through the vertex of the angle, and point F of the T-tool is initially positioned on the straight arm line or positioned on a previous point E of the T-tool for a previous loci curve.
Dependencies are inferred from the claim text.