Of horror--(Gabrielle de Vergy, be it good or ill. . . But a smaller bevel on the page. Aberration, spherical, of lens, 243. Acoustics, 294. Achromatic lens, 243. Action carriage of piano, 280. Spagnoletti disc instrument, 212. Sparking-plug, _102_. Spectacles, use of, 48. Focus, meaning of, 237; principal, 238.