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The shape and material of the restoring spring are, of course, determined to a considerable extent by the length of the lever arm which acts on the spring, and on the space which is available for the spring.

Be kind ye seas—winds lend your gentlest wing, May in each creek, sweet wells restoring spring!—

If only they might cut away through the thicket to that restoring spring!

Be kind, ye seas—winds, lend your gentlest wing, May in each creek sweet wells restoring spring!—