shade glass

shade glass

[′shād ‚glas]
(optics)
A darkened transparency that can be moved into the line of sight of an optical instrument, such as a sextant, to reduce the intensity of light reaching the eye.
References in periodicals archive ?
Outside (above), angled west wall has roll-down dlinds to shade glass from summer sun; stucco blends addition with existing exterior
Limited Tenders are invited for Creame Shade Glass Putty For Steel Frames