Pitch

'picchen, I. That quality of sound(puk) which. the relative rapidity of the vibrations that produce the sound. In percu ion, variations in the pitch of the sounds elicited may have a high diagnostic importance; e.g., in the case of the lungs, a high-pitched note on percu ing the chest usually indicates either consolidation of the lung-ti ue or the presence of something abnormal between the lung and the chest wall. 2. The residue remaining in the still after nearly all the volatile constituents have been driven off in the fractional distillation of coal-tar. It has a specific gravity of from 1. 09 (soft pitch) to 1. 12 (hard pitch). P., Burgundy, the prepared resin of Abies excels a. When pure, it is a brittle, yellowish-brown, adhesive substance, readily soluble in water, in absolute alcohol, and in glacial acetic acid. It is used in the preparation of pitch-plaster. P., Canada, the prepared resin of Abies can a dens is. It is a brittle, reddish, opaque substance, containing traces of a volatile oil. It is used for the manufacture of plasters. P., Jew's, P., Mineral, asphalt. P.plaster, emplastrum pic is.