CO-Tf4 Conical Orthopolar

This transformation maps a line into another line.

CO-Tf4 is the equivalent of 5P-s-Tf4.

Construction of CO-Tf4(L)

• Let L be a random line.
• CO-Tf4(L) is the locus of CO-Tf3(P) with P varying on L.

Another construction of CO-Tf4(L)

This construction was found by Eckart Schmidt. See Ref-34, QFG#2811.

• Let L be the line to be transformed.
• Let Pl be the pole (CO-Tf2) of L.
• Let Lp be the line through Pl perpendicular to L.
• Let Lc be the reflection of P.CO-P1 in the main axis of CO.
• Then CO-Tf4(L) is the polar of the intersection point of Lp and Lc.

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