How do you find the limits of areas on a chart?

Mxsmanic wrote:
Robert M. Gary writes:
I looked up "chart plotter" on Google, but I don't seem to be finding
any mechanical devices, just software for PCs and the like.

I believe the type you are looking for is a "sectional plotter". A
sectional is a type of chart. The plotter is mated to the chart by the
scale of its ruler. I also have plotters for low-alt enroute charts.

What is a Wizwheel? It sounds almost like a slide rule.

Slide rules are way old school. The Wizwheel is the moden version of
the slide rule.
When I was in D.C. at the Air and Space museum they had a WWII pilot's
Wizwheel. It was way more complicated than ours in that it had
calculations for dropping bombs. I want to say there were 2 or 3 wheels
on it. I guess one guy in a cockpit flighting and dropping bombs needs
a pretty compact computer.

-Robert