Talbot's Curve

Parametric Cartesian equation:
x = (a2 + f2sin2(t))cos(t)/a, y = (a2 - 2f2 + f2sin2(t))sin(t)/b


Click below to see one of the Associated curves.

Definitions of the Associated curves Evolute
Involute 1 Involute 2
Inverse curve wrt origin Inverse wrt another circle
Pedal curve wrt origin Pedal wrt another point
Negative pedal curve wrt origin Negative pedal wrt another point
Caustic wrt horizontal rays Caustic curve wrt another point


If your browser can handle JAVA code, click HERE to experiment interactively with this curve and its associated curves.

This curve was investigated by Talbot.

Talbot's curve is the negative pedal of an ellipse with respect to its centre. It has four cusps and two nodes provided the square of the eccentricity of the ellipse is greater than 1/2.


Main index Famous curves index
Previous curve Next curve
Biographical Index Timelines
History Topics Index Birthplace Maps
Mathematicians of the day Anniversaries for the year
Societies, honours, etc Search Form

JOC/EFR/BS January 1997

The URL of this page is:
http://www-history.mcs.st-andrews.ac.uk/Curves/Talbots.html