American Association for the Advancement of Science. A SPINDLE SUPPORT FOR SPINNING MACHINES. DUFFY'S SUPPORT FOR SPINNING SPINDLES. chamber and into passages finally leading to the tubu lar socket at the base. PALMER'S IMPROVED CARPENTER'S CHISEL. A Curious Chemical—Oxalomolybdic Acid. minutes the blue changes to black and the characters are then no longer destroyed by water Keeping at It. The Population of the United States. and three-quarters The estimated foreign population The Sourees of Beautiful Colors. AN IMPROVED CAR COUPLING. NUSLY'S CAR COUPLING. erent heights., scientific american, 1889-06-29
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