Pendleton
a town of Oregon, the county-seat of Umatilla co.
It is on the Umatilla river and on the Oregon Railroad and Navigation Company and the PENFIELD Gerbert (poisoned in 1102), making the first escapement. Henry de Wyck (1364), Harris Henry Harris (
1641), and Huyghens (about 1657), applied it to clocks; Galilei, in 1581, having recommended a pendulous weight as a true measurer, and Sanitorius, in 1612, the combination of a pendulum with wheel work. Pendulums generally move in arcs of circles. In the cycloidal pendulum the rod of suspension describes the arc of a cycloid, and in the conical a cone. contracts the rod of a pendulum, if it be of a single metal, as steel or iron. To neutralize these effects compensation pendulums are made; the gridiron pendulum having bars of iron and brass to work against each other, and the merthe oscillation of the bob uniform by the curial pendulum making the center of expansion and contraction of mercury inside. The curved line along which the bob of a pendulum moves is called the that are the axis of oscillation, and the arc of vibration, the horizontal chord of point around which the pendulum moves the point of suspension, or the center of motion. The length of a pendulum vibrating seconds is directly proportionate to the force of gravity at the place. One constructed to beat seconds at London (lat. of Greenwich Observatory, 51° 28' N.) at the sea-level must measure 39.13983 inches; at the equator, 39.02074 inches.
Heat lengthens, and cold Washington and Columbia River rail- inches; and at Spitzbergen, 39.21469 roads. It is the center and distributing point of an important wheat-growing and cattle-raising regions. Its industries include flour mills, woolen mills, machine shops, etc. Water power is supplied by the river, which is crossed by four bridges. The public buildings include a court house, a public library, a State hospital for the insane, and a Federal building. Pop. (1910) 4,460; (1920) 7,387.