Pitch
a term applied to a variety of resinous substances of a dark color and brilliant luster, obtained from the various kinds of tar produced in the destructive distillation of wood, coal, etc. In architecture, the rise or versed sine of an arch. In carpentry, the inclination of a roof. The common pitch has a rafter three-quarters the length of the span; the Gothic has a full pitch; the rafters being the length of the span; the Greek has a pitch 1/9 to 1/7 of the span; the Roman has a pitch from 1/5 to % of the span; and the Elizabethan has rafters longer than the span.
In hydraulic engineering, in overshot water wheels the bucket-pitch is a circular line passing through the elbows of the buckets. The elbow is the junction of the floor and the arm, which together form the bucket. In machinery: (1) the distance between the threads of a screw measured on a line parallel to the axis. (2) The distance between the centers of two adjacent teeth in a cog- SIR ISAAC PITMAN
In music, musical sounds give to the mind a feeling of acuteness or gravity according to the rapidity or slowness of the vibrations producing them; hence, the former are called acute or high, the latter grave or low. The absolute pitch of sounds is measured by giving the number of vibrations per second which produces a given sound, e. g., C = 528; the relative pitch of sounds is described by giving the ratio of vibrations of the interval, e. g., a fifth is 2:3-that is, the higher sound of any interval of a fifth gives three vibrations, while the lower sound in the same time gives two. The determination of fixed pitch is purely arbitrary, and it has from time to time undergone great variations. In England we have high concert pitch C = about 540, more or less, and the medium pitch C = 528; on the Continent the French "diapason normal," C = 518, is being largely adopted. The official standard adopted in the United States during the world's fair was what is known as international or "French" pitch, which gives as a standard middle A with 435 vibrations, though the majority of American PITCH BLENDE PITT upright pianos are tuned to high concert subject entitled "Stenographic Soundpitch. In planes, the slant of a plane bit in edition, 1840); and "Phonographic Reits stock. pins, which, in floor-cloth printing, an- the head of the Phonetic institute at ock.
In printing, one of the guide porter's Companion" (1853). He was measured along the axis, of a complete In shipbuilding: (1) The pitch of the ing reform. He was knighted in 1894, paddles is the distance between them, and died Jan. 22, 1897. hand," in 1837; "Phonography" (8th measured on the circle which passes class through their centers. It is commonly United States Supreme Court. Born at from 1.6 to double their depth. (2) The Morristown, N. J., 1858, and graduated pitch of a propeller-screw is the length, from Princeton in the class of '79. Afmeasured along the axis, of a complete ter that date he practiced law at Morof 86.5 oxide of uranium, 2.5 black oxide the pitch gradually increases from the Congress as a Republican representative. leading to the following edge.