AN IMPROVED ELECTRIC CURRENT REGULATOR. CROUCH'S RHEOSTAT. AN IMPROVED DRAUGHT EQUALIZER. BEVENS' DRAUGHT EQUALIZER. Planting Trees. AN AUTOMATIC CABLE PROPELLER FOR VESSELS. LOTZE'S CURRENT PROPELLER FOR VESSELS. A DEVICE FOR EXTINGUISHING FiRES ON SHIPS. TRAVIS' FIRE EXTINGUISHER FOR SHIPS. AN IMPROVED MACHINE FOR TURNING TENONS. ROGERS' MACHINE FOR TURNING TENONS., scientific american, 1889-06-15

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