Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 201
ean; but there is always a film of moisture on its surface,which attracts dust, and impairs very much the transmitted light. Rough plate morereadily retains the dirt, and, when it is used as floor-lights, becomes scratched. It istherefore usual, in the better class of buildings, to use a cast white…
Mechanical drawing
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