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Maiden Castle

(Encyclopedia)Maiden Castle, prehistoric fortress, Dorset, S England, near Dorchester. The finest earthwork in the British Isles, c.120 acres (50 hectares) in area, is there. Two sets of large-scale excavations at ...

E, letter of the alphabet

(Encyclopedia)E, fifth letter of the alphabet. It is a usual symbol for a mid-front vowel, such as ĕ in the English step. A mid-front vowel was represented by Greek epsilon [Gr.,=e without the aspirate], to which ...

Cressy, Hugh Paulinus

(Encyclopedia)Cressy, Hugh Paulinus krĕˈsē [key], 1605–74, English Benedictine monk. He was educated at Oxford and converted to Roman Catholicism in Rome in 1646. His Exomologesis (1647) is an apologia for his...

fifth force

(Encyclopedia)fifth force, postulated fifth basic force of nature (the four known forces of nature are gravity, electromagnetism, and the strong and weak interactions). Proposed in 1986 to account for gravitational...

Peregrinus, Petrus

(Encyclopedia)Peregrinus, Petrus (Peter the Pilgrim) pēˈtrəs pĕrəgrĭnˈəs [key], c.1220–?, medieval scholar and soldier. The tutor of Roger Bacon, he wrote the first important study of magnetism, Epistola ...

Pacher, Michael

(Encyclopedia)Pacher, Michael mĭkhˈäĕl päˈkhər [key], c.1435–1498, German religious painter and probably a wood carver, a native of the Tyrol. He painted figures reminiscent of the art of Mantegna, whose w...

hydrometer

(Encyclopedia)hydrometer hīdrŏmˈətər [key], device used to determine directly the specific gravity of a liquid. It usually consists of a thin glass tube closed at both ends, with one end enlarged into a bulb t...

chart

(Encyclopedia)chart, term referring to maps prepared for marine navigation and for air navigation. All charts show, in some convenient scale, geographic features useful to the navigator, as well as indications of d...

pen

(Encyclopedia)pen, pointed implement used in writing or drawing to apply ink or a similar colored fluid to any surface, such as paper. Various kinds of pens have been used since ancient times. Reeds that were slit ...