AN IMPROVED GUARD FOR STEP LADDERS. MEISEL'S GUARD FOR STEP LADDERS. AN IMPROVED FIRE ESCAPE. BERDROW & PELKEY'S FIRE ESCAPE. Refrigerator Cars. AN IMPROVED AXLE. WILSON'S AXLE. Russian Petroleum. How Scarlet Fever Poison is Distributed. AN IMPROVED RAILWAY. FADDIS' RAILWAY. Paper from Wood. AN IMPROVED PLOW CLEVIS. COLE'S CLEVIS FOR PLOWS., scientific american, 1889-02-23
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