AN IMPROVED CAR TRUCK. ESTERLEY'S CAR TRUCK. Why the Maple Sap Flows. 4 The Bicycle Lamp. AN IMPROVED HABIE TUG. HOBERECHT'S HABIE TUG. AN ELECTRICALLY CONTROLLED SPEAKING TUBE. WILLIAMSON'S ELECTRICALLY CONTROLLED SPEAKING TUBE. Test for Arsenical Wall Papers., scientific american, 1895-06-22
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