Inaudible Sounds Made Audible. Calculating Capacity of Cisterns. Interest Problem in Query 22 of December 15 1888. Wet and Dry Air. DECISIONS RELATING TO PATENTS. A New Ruling Pen. THE BARBED WIRE PATENT. Coal. Jugglers' Tricks-Practice as Well as Original Aptitude Required. Why Rails in Use Rust Less Quickly than Rails at Rest., scientific american, 1889-01-12
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