Re: [ATM] Raised zone

[Jim Burrows <burrjaw@earthlink.net>]

At 2006-05-24 18:03 -0400, Mark Holm wrote:

>mjlazo@ifsc.usp.br wrote:
> > After this the zone was reduced to 1/4" wide. I
> > try the correction again but it di not work. How can I work this 1/4" 
> wide at
> > 1/8" of the mirror edge? The zone is about 1.5/lambda high.
> > Tanks,
> > Matheus
>I notice that it has been three days since Mateus posted this question
>and there has been no reply, on list.  I would reply, but don't really
>consider myself qualified.  Not so good at figuring myself.  So anybody
>have a suggestion for Matheus?

Recent attempts at refiguring an RC cass secondary says that I'm not very 
good at it, either.  So back to the source, A.T.M. Advanced, 1946, p. 43:
"... and then removing the last quarter-inch raised zone with the finger 
tips.  To do this, place the mirror face up, with the handle down in a milk 
bottle, paint rouge around the marginal zone, and make about 1" strokes 
parallel with the edge of the mirror.  Use the tips of the first three 
fingers just inside of, and extending to the edge; using the thumb as a 
guide against the side of the mirror.  Use plenty of pressure and revolve 
the mirror slowly by grasping the flange of the handle with the other hand, 
so that each stroke advances about on-quarter inch past the previous 
one.  Three revolutions of the mirror is enough of this without testing to 
be sure the action is where it is wanted and not producing a ditch."

         -- Jim Burrows
         -- mailto://burrjaw@earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84) 

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