[ATM] 4" Pyrex, back after 10 years of gathering dust

[Francis J. O'Reilly]

Of course, Ecclesiastcus is a twelve chapter book in the old testament
----- Original Message ----- 
From: "Richard Schwartz" <richard1941 at gmail.com>
To: "Berthold Hamburger" <b-hamburger at artinso.com>
Cc: <atm at atmlist.net>
Sent: Friday, October 30, 2009 9:54 PM
Subject: Re: [ATM] 4" Pyrex, back after 10 years of gathering dust


> 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:
> 
>> Richard,
>>
>> 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  
>> pressing
>> the lap in your pressure cooker.
>>
>> Let me know if it works!
>>
>> Berthold
>>
>> -- 
>> Berthold Hamburger - Cellist/Spain
>> Email: behambu at artinso.com
>> http://www.artinso.com
>> http://www.astro.artinso.com
>>
>>> -----Original Message-----
>>> From: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On  
>>> Behalf
>>> 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  
>>> correct
>>> the figure-- a badly pitted deep central area surrounded by glass  
>>> that
>>> 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  
>>> focus
>>> 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>
>>> wrote:
>>>
>>>> ----- 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
>>>> years,
>>>> 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
>>>> ok.
>>>> It's an incredible anxiety mill for a lot of newbie mirror makers to
>>>> work
>>>> for hours and hours without knowing whether things are going well or
>>>> not.
>>>>
>>>> For newbies, 2 minutes of sharpie test can remove hours of potential
>>>> anxiety
>>>> which could cause the mirror maker to start second guessing things
>>>> they
>>>> might be doing correctly.  They will know that they are doing ok, or
>>>> they
>>>> 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
>>>> often
>>>> the tools that build the confidence needed for many to persevere and
>>>> get
>>>> their mirrors done!  And *that* is the ultimate goal.
>>>>
>>>> - Dave
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