Sealed bag contains four sodium chloride optical window blanks. Windows are the better selected pieces from large lot stored in petri dish without desiccant. They will need to be polished both sides.

Material � NaCl
Diameter � 0.5 inches
Thickness 2mm
Focal Length � flat window
Surface finish � mostly clear, but some surface damage
Container � plastic bag containing four pieces, not individually wrapped, no desiccant

***MPN
***OEM
***SKU*** DP391

Sodium Chloride crystal window, 50mm long, 25mm wide, and 6mm thick. Crystal is sealed in plastic bag (two desiccant tubes in bag). Crystal is wrapped in tissue and could not be examined without opening. Like most salt windows, it should be assumed that this may need to be repolished. This lot consists of one crystal window.

Material � NaCl
Dimensions 50mm x 25mm
Thickness � 6mm
Focal Length � flat window
Surface finish � could not evaluate � crystal wrapped in tissue inside sealed bag.
Container � sealed plastic with paired desiccant tubes inside

***MPN
***OEM
***SKU*** DP389

Sodium Chloride window, 36mm in diameter, 9mm thick. There is a significant fracture on one edge of the crystal approximately 14mm wide, and extending about 6mm from the edge. You will probably wish to repolish one side. Window was in unsealed bag with desiccant. Part number on padded envelope is #03609.

Material � NaCl
Diameter � 36mm
Thickness � 9mm
Focal Length � flat window
Surface finish � very lightly etched on one side, other side appears blemish-free
Container � cotton-padded cloth sleeve pouch with desiccant container.

***MPN
***OEM
***SKU*** DP386

This is an individual crystal sodium chloride window. The windows show trace evidence of adhesion to the tissue that wrapped them..

Material � NaCl
Dimensions 38mm x 19mm
Thickness 4mm
Focal Length � flat window
Surface finish � very lightly etched
Container � plastic bag individually wrapped in tissue, without desiccant

***MPN
***OEM
***SKU*** DP383

This is a quantity of three sodium chloride windows. All of the windows show some adhesion to the tissue that wrapped them, one a bit worse than the others. They will need to be repolished both sides.

Material � NaCl
Dimensions 38mm x 19mm
Thickness 4mm
Focal Length � flat window
Surface finish � moderately etched
Container � plastic bag individually wrapped in tissue, without desiccant

***MPN
***OEM
***SKU*** DP382

This lot consists of two windows of an unknown salt crystal. They are suspended inside fiberboard tubes by slightly smaller tubes inserted into either side of the larger tube. I did not wish to remove the tubes, so I can only guess at the thickness, being on the order of 0.15 to 0.25 inches. The diameter is less than 1.6 inches, and may be as small as 1.550 inches. The crystal windows are in excellent condition � I could not detect any degradation. The outer tubes are lined with desiccant packages. There appear to be two identical windows � unfortunately, no markings as to compound, or dimensions. Listing includes both pieces.

Material � Unknown
Diameter 1.6 inches
Thickness 0.15 � 0.25 inches
Focal Length � flat window
Surface finish � visually excellent

***MPN
***OEM
***SKU*** DP381

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..

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We do not offer a guarantee as many of our items are purchased by professionals in need of parts and pieces.
You will find many of our items listed on our website as untested or as parts or repair units even though in they are in good used condition.

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***MPN
***OEM Van Keuren
***SKU*** DP329