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51Duplicating machines — were the predecessors of modern document reproduction technology. They have now been replaced by digital duplicators, scanners, laser printers and photocopiers, but for many years they were the primary means of reproducing documents for limited… …
52Halbach array — A Halbach array, showing the orientation of each piece s magnetic field. This array would give a strong field underneath, while the field above would cancel. The flux diagram of a Halbach array A Halbach array is a special arra …
53Spirit duplicator — A spirit duplicator (also referred to as a Ditto machine in the United States or Banda machine in the United Kingdom) was a low volume printing method used mainly by schools and churches. It was also used by members of science fiction fandom and… …
54Tena (brand) — Infobox Company company name = TENA company company type = Subsidiary of SCA foundation = 1998 location = flagicon|SWE Stockholm, Sweden industry = Incontinence products products = Pads, diapers, Serenity, Tena Lady homepage =… …
55One-time pad — Excerpt from a one time pad In cryptography, the one time pad (OTP) is a type of encryption, which has been proven to be impossible to crack if used correctly. Each bit or character from the plaintext is encrypted by a modular addition with a bit …
56Jeffrey R. MacDonald — Jeffrey Robert MacDonald, M.D. (b. October 12, 1943), is an American doctor tried and convicted in 1979 for the murders of his pregnant wife and two daughters in February 1970. Early life Jeffrey Robert MacDonald was born in Jamaica, Queens. In… …
57Carbon copy — For other uses, see Carbon copy (disambiguation). A copy made with carbon paper Carbon copying, abbreviated cc or c.c., is the technique of using carbon paper to produce one or more copies simultaneously during the creation of paper documents.… …
58Carbon paper — (originally carbonic paper) is paper coated on one side with a layer of a loosely bound dry ink or pigmented coating, usually bound with wax. It is used for making one or more copies simultaneous with the creation of an original document.… …
59Barbat (lute) — Barbat Classification Plucked string instrument Related instruments Bouzouki Mandolute Oud Pandura …
60Carbon — Car bon (k[aum]r b[o^]n), n. [F. carbone, fr. L. carbo coal; cf. Skr. [,c]r[=a] to cook.] (Chem.) 1. An elementary substance, not metallic in its nature, which is present in all organic compounds. Atomic weight 11.97. Symbol C. it is combustible …
