Sagitta Rule: Difference between revisions

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In Live Steam a [[Sagitta Rule]] is used to directly measure the radius of a curved section of track.
In Live Steam a [[Sagitta Rule]] is used to directly measure the radius of a curved section of track.
* [http://ibls.org/files/2020/CharlesField_TrackPanelJig/150_Sagitta_Rule_for_10_Foot_Rail.pdf 130 Sagitta Rule for 10 Foot Rail (PDF)]

Revision as of 15:45, 1 December 2020

Visualization of the sagitta. The red line marked with s is the sagitta of the arc.

From Wikipedia:

In geometry, the sagitta of a circular arc is the distance from the center of the arc to the center of its base. It is used extensively in architecture when calculating the arc necessary to span a certain height and distance.

In Live Steam a Sagitta Rule is used to directly measure the radius of a curved section of track.