ed with one or more re- This ingenious device has been patented recently by Mr. opener and closer. cesses, having in the bottom a transverse ridge. The keys W. D. Matney, of Harvel, Il]., who should be addressed for By turning the crank so as to close the blind, and by con- fitting these recesses… … The following may be observed as safe falls for circular IMPROVED NUT LOCK. MERRILL’S WINDOW BLIND OPERATOR, 1 in 200; 15 inch, 1 in 250; 18 inch, 1 in 306; 36 inch, 1 in two diverging recesses having a sharp pointed nose or wedge will be raised, lifting the segmental wheel out of gear with 600; 48…
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