London smoke

Lon´don smoke


1.A neutral tint given to spectacles, shade glasses for optical instruments, etc., which reduces the intensity without materially changing the color of the transmitted light.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
Admiral Nelson, also, on a capstan of gun-metal, stands his mast-head in Trafalgar Square; and ever when most obscured by that London smoke, token is yet given that a hidden hero is there; for where there is smoke, must be fire.
If Drayton were with us again to write a new edition of his incomparable poem, he would sing the nymphs of Hertfordshire as indeterminate of feature, with hair obfuscated by the London smoke. Their eyes would be sad, and averted from their fate towards the Northern flats, their leader not Isis or Sabrina, but the slowly flowing Lea.
"The skipper has his wife on board," remarked another; and the light of the crimson sunset all ablaze behind the London smoke, throwing a glow of Bengal light upon the barque's spars, faded away from the Hope Reach.
My aunt was quite gracious on the subject of the Thames (it really did look very well with the sun upon it, though not like the sea before the cottage), but she could not relent towards the London smoke, which, she said, 'peppered everything'.
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