I found something interesting relating to this in
Tom Witte's reprint of the Norris catalog (obtained
from John Zimmers).
On pg 11:

"Patent Norris High Pitch Setting Device"

"With the aid of this ingenious device, the user
can sharpen a plane iron in such a manner as to
convert an ordinary plane into a higher pitched
plane giving *most satisfactory results* on hard
or curly grained material."

"To be attached to plane iron as shown while setting.
Printed instructions for use given with each device."

				"Price 1/6"

The illustration shows a bent metal gizmo screwed to
the back of a plane iron. It looks like it was meant
to take the place of the cap iron and allow you to
install the iron bevel up in the plane giving a
"cutting" angle >90 deg. I guess the device also 
helped close up the mouth with the bevel up.
Functionally like the scraper attachment that Lee
Valley is now selling.
I wonder if Norris sold many of these?

Carl

Just say: Doesn't say anything about how it will work on
          Wenge.