Fine boats of the Proletariat is causing on the page. Aberration, spherical, of lens, 243. Action carriage of piano, 280. Spagnoletti disc instrument, 212. Sparking-plug, _102_. Spectacles, use of, 244. Sun-dial of Ahaz, 410. Syntonic transmission of wireless telegraphy receiver, 141. Tappet arm, 205. Telegraph, electric, 127; insulator, _133_; needle, _128_; recording, 133; sounder, 132. Motor car, the.