What is "sound boarding"

Sound \Sound\, n. [OE. soun, OF. son, sun, F. son, fr. L. sonus akin to Skr. svana sound, svan to sound, and perh. to E. swan. Cf. Assonant, Consonant, Person, Sonata, Sonnet, Sonorous, Swan.]

1. The peceived object occasioned by the impulse or vibration of a material substance affecting the ear; a sensation or perception of the mind received through the ear, and produced by the impulse or vibration of the air or other medium with which the ear is in contact; the effect of an impression made on the organs of hearing by an impulse or vibration of the air caused by a collision of bodies, or by other means; noise; report; as, the sound of a drum; the sound of the human voice; a horrid sound; a charming sound; a sharp, high, or shrill sound.

   The warlike sound Of trumpets loud and clarions.
   --Milton.

2. The occasion of sound; the impulse or vibration which would occasion sound to a percipient if present with unimpaired; hence, the theory of vibrations in elastic media such cause sound; as, a treatise on sound.

   Note: In this sense, sounds are spoken of as audible and inaudible.

3. Noise without signification; empty noise; noise and nothing else.

   Sense and not sound . . . must be the principle.
   --Locke.

   Sound boarding, boards for holding pugging, placed in partitions of under floors in order to deaden sounds.

   Sound bow, in a series of transverse sections of a bell, that segment against which the clapper strikes, being the part which is most efficacious in producing the sound. See Illust. of Bell.

   Sound post. (Mus.) See Sounding post, under Sounding.