In article .com,
"Tony Cox" wrote:

Here's a question that until yesterday I'd have thought was
obvious.

Cessna-style (and no doubt other) ignition switches have five
settings -- Off/Right/Left/Both/Start. When you're on the "Right"
setting, does it mean you are firing on the right magneto or
does it mean the right magneto is grounded?

Right magneto is "hot" (ungrounded). The "OFF" position grounds both
mags.