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Re: [ATM] .707*Radius

>Richard Schwartz wrote:
>
>>> .....  Essentially half the mirrors weight falls either side of this
>>> also, so in the past this was a popular place to support the mirror
>>> within its cell.
>>
>>
>>
>> This is true only if the mirror thickness does not change with the
>> radius.
>>
>>
>Agreed!!!  But this never stopped the old telescope making books from
>using it as the location point for supports.

The reason is obvious: the relative thickness change for 1:6 ratio mirrors
is close to 0.

/Arjan

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