1. ALL DIMENSIONS ARE IN MILLIMETERS. rpZ^R}B%*v
2. MATERIAL: OPTICAL GLASS PER MIL-G-174 x^ J}]5{0
TYPE: HZK21 CDGM NO.623581 u0M? l
NP 1.6230 ± V ± 58.2 T/$6ov+K
STRIAE GRADE , ANNEAL AusCU~:>
MELT NO. 4.^1D';(
3. 'P' PITCH POLISH TO TEST PLATE WITHIN = DT7]fU
POWER AND IRREGULARITY INDICATED. juAUeGT
4. MANUFACTURE PER MIL-O-13830 <A_L Zi
5. SURFACE QUALITY EC]b]'._
6. 'C' MAGNESIUM FLUORIDE COATING PER MI c~0hu*&
FOR MAX TRANSMISSION AT MILLI )U~,q>H+
%
7. 'G' FINE GROUND & BLACKENED PER O'OVj
8. BEVEL EDGES AT 45 DEG TO MAX FA *_aeK~du.
9. DIAMETER TO FLAT IS (REF) Eed5sm$H
WITH SURFACE SAG OF ON SURFA