More efficient, non-glare light may be obtained from an electric lamp by equipping the bulb with a cobalt blueglass cap. The cap fits the large end of twenty-five, forty, sixty and seventyfive watt blubs. Eye-sight injury from the strain of sharp light is. prevented by the soft glow from a capped bulb.
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https://paperspast.natlib.govt.nz/newspapers/TDN19350601.2.97.6
Bibliographic details
Taranaki Daily News, 1 June 1935, Page 13 (Supplement)
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52Untitled Taranaki Daily News, 1 June 1935, Page 13 (Supplement)
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