. New York City record and building trades directory. ^0 y^H l|I/jPs:iil]5 %^::(X$ 3 m £ I w\A § SlfSfejfl H. :Af .-• No. ., TOP, View ,: ; >,«-.••? No. a. Bottom View;; Lenses, 2 in. and 3in. Square. S illustrated in the aboveT cuts, the lenses> in this, our new Square Opening Concfete Light, areround on top and square atthe bottom, each lens thus having a larger, distributive area? than its attractive or upper surface, whereby its diffusive qualities are. greatly increased. In vault light work of a Tike nature the lenses are of the same diameter top and bottom, andIwhen se

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. New York City record and building trades directory. ^0 y^H l|I/jPs:iil]5 %^::(X$ 3 m £ I w\A § SlfSfejfl H. :Af .-• No. ., TOP, View ,: ; >,«-.••? No. a. Bottom View;; Lenses, 2 in. and 3in. Square. S illustrated in the aboveT cuts, the lenses> in this, our new Square Opening Concfete Light, areround on top and square atthe bottom, each lens thus having a larger, distributive area? than its attractive or upper surface, whereby its diffusive qualities are. greatly increased. In vault light work of a Tike nature the lenses are of the same diameter top and bottom, andIwhen set in the plates the under portion has a smaller area than the top, as the bearing of the tileson which the. glasses are set obstruct just so much of the light passing through each lens1 &$ tomake loss of the actual light area nearly fifteen per cent., while by using the square bottom lenseswe gain really double this per cent., and by setting each lens in a separate light opening/each di-rectly connected; we atfe^enabledto set ^sqt mahy^more to ea«h square foot, and thus we gain anaddition

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbuilding, bookyear189