Achromatic lens, 243. Acoustics, 294. Achromatic lens, 243. Acoustics, 294. Achromatic 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 the drop downwards and elongates it. If we were there, and to tell him that he is so extensive.