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missal

(Encyclopedia)missal [Lat.,=of the mass], in the Roman Catholic Church, liturgical book containing all directions and texts necessary for the performance of Mass throughout the year. The Roman Missal (Missale Roman...

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...

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...

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...

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 ...

combining weight

(Encyclopedia)combining weight, the proportion (by weight) in which a chemical element combines with other elements to form compounds. The determination of combining weights was a very important part of early chemi...

Laguna District

(Encyclopedia)Laguna District [Span.,=lake], irrigated area in E Durango and W Coahuila states, N central Mexico. Originally a 900,000-acre (364,200-hectare) tract, consisting of large estates, the land was reappor...

biosphere

(Encyclopedia)biosphere, irregularly shaped envelope of the earth's air, water, and land encompassing the heights and depths at which living things exist. The biosphere is a closed and self-regulating system (see e...