The Meta-Encyclopedia

Single-source entries: P (79)

These 13 listings are so strange that each appears in only one of the 7 encyclopedias we compared. They include such classics as Pneumatic Cranes, Pneumatic Gun, Pneumatic Lifts.

Pneumatic Cranes

Are being extensively used because of their convenience, especially for moderate duty. The transmission of air under pressure results in none of the annoyances from leakage incident to steam and hydraulic piping, and obviates all trouble in disposing of the exhaust, as this may be allowed to discharge anywhere without inconveniencing any one. See CRANES.

Only in The Encyclopedia of Founding

Pneumatic Gun

a gun operated by compressed air.

Only in Collier's New Encyclopedia

Pneumatic Lifts

These lifts are now becoming common among blast-furnaces in different parts of the world, as compressed air is readily obtained from the blowing-engines which supply the furnaces. A wrought-iron cylinder, with its top end closed, somewhat longer than the distance to be travelled is suspended in a tank by counter-weights, after the manner of a gasometer. Air at three or four pounds above the atmospheric pressure is forced into the tank through a pipe. The load is lifted to the height required, and as the whole of the working parts are balanced, the amount of power required is only what will be sufficient to elevate the load. The return stroke is obtained by allowing the air to escape through a valve into the atmosphere, the empty wagon being weight sufficient to lower the bell in the tank. The motive power for the Gjers pneumatic lift is obtained from a pair of double-acting air-pumps, the lift being effected by the pressure of the atmosphere acting against a vacuum in a cylinder, the empty wagon being returned by the compression of air on the under side of the piston. See ELEVATOR.

Only in The Encyclopedia of Founding

Pneumatic Tire

a rubber tire made hollow and then inflated with air. In common use for the wheels of motorcars, bicycles, etc.

Only in Collier's New Encyclopedia

Pneumoconiosis

affection of the in a dustlungs arising from occupation laden atmosphere. It takes a form of bronchitis, with the developchronic parment of a catarrhal condition and , shrinking and coloring tial pneumonia the the tissues. Among stone cutters phthisis, and among disease is known as as anthracosis. Its maniminers occupation, but festations vary with the the mortality is heavy in all.

Only in Collier's New Encyclopedia

Pneumogastric Nerve

a nerve, called also par vagum, which, proceeding the upper part of the from the neck to pharabdomen, supplies branches to the , liver, spleen ynx, œsophagus, stomach , . and respiratory passages

Only in Collier's New Encyclopedia

Pnyx

niks, a place of public assembly in ancient Athens. It occupied an open-air terrace leveled off on the slope of a hill, southwest of the Acropolis. In shape, it was a sector of a circle--to use a homely illustration, about two-fifths of a round pie--with the wide apex pointing toward the center of the hill. A semicircular retaining wall upheld the outer boundary. The apex was cut down about thirteen feet into the solid rock. A cube of rock left at the apex and ascended by three steps from either side served as a platform for public speakers. When Demosthenes or some other famous orator ascended the bema, as it was called, to address the populace, he faced a surging mass of humanity 212 feet deep, extending 197 feet to the right and left. The bema was originally the lowest point of the pnyx. During the centuries that have passed many of the huge stone blocks of the retaining wall have been removed or have slid down hill, giving the old arena an outward slope.

Only in Aiton's Encyclopedia

Pocahontas

daughter of Powhatan, a powerful Indian chief of Virginia; born about 1595. She displayed a friendliness toward the British colonists, first at 12 years of age, in saving the life of Capt. John Smith, who had been captured and condemned to death by her father. In 1612, while on a visit to a neighboring tribe, she was seized and held as a hostage by the English. While on shipboard she became acquainted with, and married John Rolfe, an Englishman, who took her to England, where, in 1616, she was presented at court. She had one son, from whom numerous wealthy families of Virginia claim descent. She died in England, while preparing to return to America, in 1617.

Only in Collier's New Encyclopedia

Pocatello

a city of Idaho, the county-seat of Bannock co. It is on the Port Neuf river, and on the Oregon Short Line railroad. It is the center of an important mining, stock raising, and agricultural region, and has the division headquarters and machine shops of the Oregon Short Line railroad It is the seat of the Idaho Technical Institute and of the Holy Cross School, public library, and Y. M. C. A. buildings. Pop. (1910) 9,110; (1920) 15,001.

Only in Collier's New Encyclopedia

Pocket

The temporary extension of a flask in one or more direction, to fit it for use on some special casting for which it had not been originally designed.

Only in The Encyclopedia of Founding

Pocket Chronometer

A pocket watch with chronometer escapement.

Only in American Watchmaker and Jeweler

Podesta

the title of certain officials sent by Frederick I. in the 12th century to govern the principal cities of Lombardy. Also a chief magistrate of the Italian republics of the Middle Ages, generally elected annually, and intrusted with but absolute power, and an inferior municipal judge in some cities of Italy.

Only in Collier's New Encyclopedia

Podiebrad

GEORGE BOCZKO, King of Bohemia; born of a noble family in Podiebrad, April 6, 1420, and became an adherent of the moderate party of the Hussites. When the Catholic barons (1438) carried the election of Albert V. of Austria (II. of Germany), Podiebrad allied himself with the Utraquists in Tabor, who offered the sovereignty of Bohemia to Casimir, King of Poland. After forcing Albert to raise the siege of Tabor and retire to Prague, Podiebrad was recognized as the leader of the Utraquists; then he seized on Prague (1448), and got himself made governor or regent of Bohemia, from 1453 to 1457, for the young king Ladislaus. On the death of Ladislaus, Podiebrad was chosen his successor, and was crowned early in 1458. In 1462 he decided to uphold the terms of the compactata of Prague (1433); this angered the Pope, Pius II., and he was only prevented from excommunicating Podiebrad by the emperor. The next Pope, Paul II., did in 1466 promulgate against him the ban of excommunication. Matthias Corvinus of Hungary was the only prince who took the field to enforce but him Podiebrad surrounded at Wilamow (1469) and forced into a truce. Nevertheless Matthias was crowned king by the Catholic barons at Olmütz immediately afterward. Podiebrad died March 22, 1471.

Only in Collier's New Encyclopedia