Saccharin : Constantine Fuhlberg, Ira Remsen, U.S.A., 1879.
Safety Pin : Walter Hunt, U.S.A., 1849.
Saturn, Ring Around : Christian Huygens, The Netherlands, 1659.
Seismograph : (first accurate) John Bohlin, Sweden, 1962.
Sewing Machine : Elias Howe, U.S.A., 1846; (continuous stitch) Isaac Singer, U.S.A., 1851.
Spectrum : Sir Isaac Newton, England, 1665-1666.
Steam Engine : Thomas Savery, England, 1639; (atmospheric steam engine) Thomas Newcomen, England, 1705; (steam engine for pumping water from collieries) Savery, Newcomen, 1725; (modern condensing, double acting) James Watt, England, 1782; (high-pressure) Oliver Evans, U.S.A., 1804.
Steel, Stainless : Harry Brearley, U.K., 1914.
Stethoscope : Rene Laennec, France, 1819.
Submarine : Cornelis Drebbel, The Netherlands, 1620.
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