Cold Water without Ice. AN ARTIFICIAL LAKE AND WATER SLIDE. AN IMPROVEMENT IN LOCKS AND KEYS. FISHER'S LOCK AND KEY. Condition of Workers Here and Abroad. An Imprisoned Fish. A CONVENIENT SPONGE FOR CLEANING SLATES. INGLIS' ARTIFICIAL WATER SLIDE FOR PLEASURE RESORTS. HUDSON'S SLATE-SPONGE., scientific american, 90-09-13
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