1. ALL DIMENSIONS ARE IN MILLIMETERS. x1Z*R+|>2
2. MATERIAL: OPTICAL GLASS PER MIL-G-174 f85~[3
J
TYPE: HZK21 CDGM NO.623581 eDvh3Y<D
NP 1.6230 ± V ± 58.2 )RQQhB
STRIAE GRADE , ANNEAL !t\sg
MELT NO. FW{K[km^P
3. 'P' PITCH POLISH TO TEST PLATE WITHIN zU_dk'&,
POWER AND IRREGULARITY INDICATED. Hlpt zez
4. MANUFACTURE PER MIL-O-13830 c6SXz%'k
5. SURFACE QUALITY p8Z;QH*
6. 'C' MAGNESIUM FLUORIDE COATING PER MI ]ZNFrpq
FOR MAX TRANSMISSION AT MILLI zMd><UQP{
7. 'G' FINE GROUND & BLACKENED PER
=y`-:j\
8. BEVEL EDGES AT 45 DEG TO MAX FA E0+~c1P-
9. DIAMETER TO FLAT IS (REF) 0?O_]SD
WITH SURFACE SAG OF ON SURFA