Thank you for the update Robert. I'll get it in the next edition. And congratulations on another Cave!
I had a note on that one that it was also engraved "DK", wondering if that meant Dall-Kirkham?
Yes it is engraved DK.
I was reading most of the Cave cassegrains are Dall-Kirkham.
Nothing on the secondary noting DK, so maybe all 10 inch by this time were DK.
I recognize the hand writing on the secondary as Cave.
I'm not sure what the underlined 'Perfect' means, perfect sphere? which is what
it would be for a DK.