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Scientific American Volume Xxiv No 12 March 18 1871 A Weekly Jo
*Knots and Splices 175 Influence of Cold on Iron and Steel. 176 Oak Graining in Oil Colors 176 Knots and Splices (Explanation) 177 Hartford Steam Boiler and Insurance Co.'s Report 177 *Improved Spiral Spring for Railway Carriages 178 *Portable Writing and Copying Case 178 How...