metal-graphite bearing material
71Tattoo — For other uses, see Tattoo (disambiguation). A tattooed woman in the United States, ca. 1907. A tattoo is made by inserting indelible ink into the dermis layer of the skin to change the pigment. Tattoos on humans are a type of body modification,… …
72X-ray fluorescence — (XRF) is the emission of characteristic secondary (or fluorescent) X rays from a material that has been excited by bombarding with high energy X rays or gamma rays. The phenomenon is widely used for elemental analysis and chemical analysis,… …
73List of fictional swords — In Arthurian fiction [ thumb|left|ArthurExcalibur).] Excalibur is featured in every tale of Arthur or Merlin ever written, in some form or another. The examples below list two of the more distinctive takes on Arthurian swords. Bernard Cornwell:… …
74refractory — refractorily, adv. refractoriness, n. /ri frak teuh ree/, adj., n., pl. refractories. adj. 1. hard or impossible to manage; stubbornly disobedient: a refractory child. 2. resisting ordinary methods of treatment. 3. difficult to fuse, reduce, or… …
75South America — South American. a continent in the S part of the Western Hemisphere. 271,000,000; ab. 6,900,000 sq. mi. (17,871,000 sq. km). * * * Continent, Western Hemisphere. The world s fourth largest continent, it is bounded by the Caribbean Sea to the… …
76vanadium processing — Introduction preparation of the metal for use in various products. Vanadium (V) is a grayish silver metal whose crystal structure is a body centred cubic (bcc) lattice, with a melting point of 1,926° C (3,499° F). The metal is used… …
77Origin of the Romanians — History of Romania This article is part of a series Prehistory …
78Madagascar — Madagascan, n., adj. /mad euh gas keuhr/, n. an island republic in the Indian Ocean, about 240 mi. (385 km) off the SE coast of Africa: formerly a French colony; gained independence 1960. 14,061,627; 227,800 sq. mi. (590,000 sq. km). Cap.:… …
79Tibet — /ti bet /, n. an administrative division of China, N of the Himalayas: prior to 1950 a theocracy under the Dalai Lama; the highest country in the world, average elevation ab. 16,000 ft. (4877 m). 1,250,000; 471,660 sq. mi. (1,221,599 sq. km). Cap …
80Stirling engine — Alpha type Stirling engine. There are two cylinders. The expansion cylinder (red) is maintained at a high temperature while the compression cylinder (blue) is cooled. The passage between the two cylinders contains the regenerator …
