On Sat, 19 Jul 2014 22:15:48 +0100, "gareth"
wrote:

A straight Morse key has a fulcrum away from you, but your wrist
articulates in front of the key, in a mirror image of that of the key.

Therefore, your wrist is constrained to follow an unnatural arc
when keying.

Have there been any mechanical designs published so that the
keying arc is in the same sense as the wrist arc?

(cf. Watts' parallel motion, perhaps?)

When I think of a wrist following an arc repetitively

why am I reminded of OSN?