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Scientific American, Vol. 23, No. 11 (1870) (1870)
leaf 7
, I, are the ends of the blinds and into which the tenons are inserted, ing travel of the valve. The valve, being of uniform thickness and mitered at the ends to fit the A, Fig. 2, consists of a series of rings mitered bars, C, of the frame above and below the series of secured by internal ribs,… … caloric rays in artificial light which upon the frame by the screw through DONATO’S IMPROVED WINDOW-BLIND. causes fatigue to the eyes ; but this the compensating wheel, G, and The © 1870 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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