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Days without Nights and Nights without Days - p139
doi:10.1038/scientificamerican01221848-139h
Revolving Cravat and a Coat of One Piece - p140
doi:10.1038/scientificamerican01221848-140h
Teller and Dillenback's Vertical Water Wheel - p140
doi:10.1038/scientificamerican01221848-140i
Mechanical College and Experimental Workshop - p141
doi:10.1038/scientificamerican01221848-141c
Blue Color for Stamping Patterns on Cloth - p144
doi:10.1038/scientificamerican01221848-144b
