Sine bar

A sine bar is a teaching tool, with which one can determine angles up to 3 "( seconds of arc ) exactly are, for example, on the cone, which lies on the ruler, two dial gauges mounted with a height difference -. , And thus an incorrect angle - recognized can be.

On the right side of the sine bar is underpinned with parallel gauge blocks and to obtain the desired angle between the upper surface of the test angle and the ground on which the ruler is. What is the gauge blocks must be under the sine bar, is calculated with the aid of the sine function. The ruler is usually 100 mm or 200 mm long, so that the calculation is simple.

• Teaching (technology)