Product Description
This is an extraordinary set of Van Keuren fused-quartz optical flats complete with fitted hardwood cabinet. The set consists of three flats of two inch diameter and one flat of three inches diameter. All are 0.625 inches in thickness.
All four flats are accurate to 1 millionth of an inch on both surfaces. The three inch flat is marked 1CC for the bottom, 1CV for the top. All of the two inch flats are marked similarly – 1CV for the bottom and 1CC for the top. CV denotes ‘convex’, and CC denotes ‘concave’. I believe these are the highest grade flats that were commercially manufactured by Van Keuren, otherwise known as the ‘Reference’ accuracy.
The flats are in absolutely flawless condition – there are no chips, scratches, or other blemishes on any of the surfaces. There is a current calibration sticker affixed to the cabinet (due date is 31 August 2010).
Location MB 94
Photo set 761