| Gaz has PM'd me with a correct description of the answer, well done.
I used to really enjoy what they called Technical Drawing at school as well. Generating slices of sections through cones and constructing loci, great stuff!! I can never remember now whether the Parabola or the Hyperbola was the one parallel to the side of the cone!
I'll give it a few days then post the answer to the drawing puzzle.
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“Dirty British coaster with a salt-caked smoke stack, Butting through the Channel in the mad March days" |