Spagnoletti disc instrument, 212. Sparking-plug, 102 . Spectacles, use of, 249. Spectrum, colours of, 230. Speed governors, 67, 68 , 69 ; Hartwell, 70; marine, 71. Speed of motor cars, 110. Spot, blind, in eye, 251; yellow, in eye, 251. Spring balance for watches, 419; compensating, 423, 424 . Stapes, 272. Steam, what it is, 13; energy of, 14; engines, 44; engines, reciprocating, 45 ; expansive working of, 59, 81; gauge, 36; gauge, principle of, 37; turbine, 74; turbine, De Laval, 76, 77 ; turbine, Hero's, 74; turbine, Parsons, 79, 80 ; volume of, as compared with water, 15. Stephenson, George, 63, 375.
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