1831. Faraday, Exp. Res., xlvi. 314. On a peculiar class of acoustical figures: and on certain forms assumed by groups of particles upon vibrating elastic surfaces.
1859. Dickens, T. of two Cit., 65. Such a curious corner in its acoustical properties, such a peculiar Ear of a place.
1871. Earle, Philol. Eng. Tongue, § 109. The acoustical study of the organs of speech.
1877. Tyndall, in Daily News, 2 Oct., 2/5. Does it describe an optical and acoustical fact, a visible host, an audible song?
2. Promoting hearing.
a. 1845. Hood, T. of Trumpet, xxv. For the Aurist only took a mug, And pour’d in his ear some acoustical drug.
