[ATM] 4" Pyrex, back after 10 years of gathering dust
richard1941 at gmail.com
Sat Oct 31 10:54:47 JST 2009
See a Catholic bible, Ecclesiastcus 13:1. Verse 2 seems to warn
against a mirror project that is too large.
Sent from Richard's iPhone
On Oct 30, 2009, at 11:10, "Berthold Hamburger" <b-
hamburger at artinso.com> wrote:
> If you use black pitch, you have to use a black sharpie pen AND
> paint the
> lap and not the mirror.
> If you use burgundy pitch, you have to use a burgundy sharpie pen
> and paint
> the light bulb illuminating the mirror.
> If you use green pitch, you must use - you guessed it - a green
> sharpie pen
> and paint your nose, wear a skirt and perform a rain dance before
> the lap in your pressure cooker.
> Let me know if it works!
> Berthold Hamburger - Cellist/Spain
> Email: behambu at artinso.com
>> -----Original Message-----
>> From: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On
>> Of Richard Schwartz
>> Sent: viernes, 30 de octubre de 2009 6:16
>> To: Scope Builder
>> Cc: <atm at atmlist.net>
>> Subject: Re: [ATM] 4" Pyrex, back after 10 years of gathering dust
>> I have been polishing for a whole hour on this 12", but cannot
>> the figure-- a badly pitted deep central area surrounded by glass
>> is not ground at all. I cant get the tester to work at all. I tried
>> to measure the focal length by wetting the mirror, but could not
>> the sun at all. At least the sagitta is correct.
>> Does the Sharpie test wrok on a pitch lap, and does it correct my
>> figure? How do enter Sharpie test data into Sixtests software?
>> Sent from Richard's iPhone
>> On Oct 29, 2009, at 13:35, "Scope Builder" <scopebuilder at gmail.com>
>>> ----- Original Message ----- From: "Francis J. O'Reilly"
>> <foreilly at verizon.net
>>>> I never test figure until I am finished polishing. The pencil test,
>>>> sharpie test and other tests seem to be a waste of time to me.
>>> Hi, Francis.
>>> At your level of experience, I'd agree with you about not worrying
>>> about the
>>> figure prior to polishing.
>>> But.... ;-)
>>> In assisting with instruction at mirror classes over the last few
>>> I've found that tests like the sharpie test give a novice mirror
>>> maker a
>>> quick and simple method to get positive feedback that they are doing
>>> It's an incredible anxiety mill for a lot of newbie mirror makers to
>>> for hours and hours without knowing whether things are going well or
>>> For newbies, 2 minutes of sharpie test can remove hours of potential
>>> which could cause the mirror maker to start second guessing things
>>> might be doing correctly. They will know that they are doing ok, or
>>> will know that they need to do something different. Either way,
>>> that simple
>>> answer is good to them. Not perfect... but good. ;-)
>>> In my opinion... if anyone out there prefers to do sharpie or pencil
>>> tests... Go For It!!!
>>> We, as advice-givers, should never snub the small stuff. Those are
>>> the tools that build the confidence needed for many to persevere and
>>> their mirrors done! And *that* is the ultimate goal.
>>> - Dave
>>> ATM mailing list http://www.atmlist.net/
>> ATM mailing list http://www.atmlist.net/
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