BLACKING OUT small windows causes no difficulties. Blackout arrangements for large skylights with an area of several thousand square metres, however, become more complicated, especially in steel‐frame buildings, where the attachment of fixtures and the boring of the necessary holes meets with difficulties; not least because of the inaccessibility of the skylights.
Beringer, A. (1941), "Blackout in Factories: Two Methods of Obscuring Glass Roofs During Darkness, while Retaining the Benefit of Daylight I. A Simple German Method for Large Skylights", Aircraft Engineering and Aerospace Technology, Vol. 13 No. 8, pp. 225-226. https://doi.org/10.1108/eb030811
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