VOLUME VII.) [NUMBER 34. THE Scientific American, CIRCULATION 16,000. … est continuous road in the world, nearly dou- is given by turing a spindle, O, which carries ing through its axis, is the counterpart ofa This lathe is for producing either irregular ble the length of that of St. Petersburgh to two endless screws, r 7, which gear into worm gorresponding line on the…
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