[alogo] Laisant's trisector

This is a device to trisect angle (BAC). A and D are fixed points and E moves on their line. (ADFB) and (DFEC) are rhombi. Lines (AD) and (AF) trisect the angle (BAC). Later is modified by moving (Ctrl+2) E on line AD.

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For a mechanical device (linkage) to trisect angles with this principle see YatesTrisector.html .
Discussion by H. Brocard, Bulletin de la S.M.F 3(1875), p. 47-48.

See Also

YatesTrisector.html

References

H. Brocard, Bulletin de la S.M.F 3(1875), p. 47-48.

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