The Boston school compendium of natural and experimental philosophy .. (1837)
Parker, Richard Green, 1798-1869 · Boston : Marsh, Capen & Lyon · leaf 71
a machine he perfect. 192. Of what does the main-spring of a watch con-sist >. What is its use I Does the spring exert a stronger force when closely coiled,or when partly loosened ? 60 NATURAL PHILOSOPHY. a spiral groove, (called a fiisee) gradually increasing in diameterfrom the top to the… … B is the fusee surroundedby a spiral groove on whichthe chain C is wound.When the watch is recent-ly wound, the spring is inthe greatest state of tension,and will, therefore, turnthe fusee by the smallestA B groove, on the principle of the wheel and axle. As the spring loses its force by being…
Physics
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