MIL-Q-47057, MILITARY SPECIFICATION: QUARTZ, FUSED, OPTICAL GRADE (10 MAY 1974) [NO S/S DOCUMENT]

MIL-Q-47057, MILITARY SPECIFICATION: QUARTZ, FUSED, OPTICAL GRADE (10 MAY 1974) [NO S/S DOCUMENT]., This specification establishes the requirements for two types of clear optical grade fused quartz to be used in the fabrication of optical elements where a low coefficient of thermal expansion is desired.