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blueprint
blueprint white-on-blue photographic print, commonly of a working drawing used during building or manufacturing. The plan is first drawn to scale on a special paper or tracing cloth through which light can penetrate. The drawing is then placed over blueprint paper, prepared with a mixture of potass...
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citric acid
citric acid or 2-hydroxy-1,2,3-propanetricarboxylic acid, HO 2 CCH 2 C(OH)(CO 2 H)CH 2 CO 2 H, an organic carboxylic acid containing three carboxyl groups ; it is a solid at room temperature, melts at 153°C, and decomposes at higher temperatures. It is responsible for the tart taste of var...
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photocopying
photocopying process whereby written or printed matter is directly copied by photographic techniques. Generally, photocopying is practical when just a few copies of an original are needed. When many copies are required, printing processes are more economical. However, when a printing process is u...
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gene
gene the structural unit of inheritance in living organisms. A gene is, in essence, a segment of DNA that has a particular purpose, i.e., that codes for (contains the chemical information necessary for the creation of) a specific enzyme or other protein. The strands of DNA on which the genes occur ...
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sailing
sailing as a sport, the art of navigating a sailboat for recreational or competitive purposes.
Racing Classes
There is no single "yacht type" of boat, rather many types that include sloops, yawls, catamarans, and ketches. The hundreds of different racing classes fall into three broad ...
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DNA
DNA
DNA (deoxyribonucleic acid) was discovered in the late 1800s, but its role as the material of heredity was not elucidated for fifty years after that. It occupies a central and critical role in the cell as the genetic information in which all the information required to duplicate and maintain th...
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Smithson Tennant
Smithson Tennant 1761-1815, English chemist. In 1796 he proved, by burning a diamond, that the diamond consists solely of carbon. In 1804 he announced his discovery of osmium and iridium.
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Jan Masaryk
Jan Masaryk , 1886-1948, Czechoslovak diplomat, son of Thomas G. Masaryk. He was (1925-38) Czechoslovak minister to Great Britain, and in London he became (1940) foreign minister in the Czechoslovak government in exile headed by Eduard Beneš after the German occupation of Czechoslovakia. Duri...
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Americana
Americana term used to describe material printed in or about the Americas, or written by Americans; usually restricted to the formative period in the history of the two continents. Thus the letter written by Columbus in 1493 in which he announces the discovery of the Indies is the earliest item. ...
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Angelus
Angelus [Lat.,=angel], daily prayer of the Roman Catholic Church, said usually three times daily, as announced by a bell, traditionally at six in the morning, at noon, and at six in the evening. It is said in honor of the Incarnation and consists of three repetitions of the Hail Mary together with ...
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