Cojuror

A fellow-juror; one who swears to another's credibility. Cojutepec, ( ko - hoo'te - paik ,) a town of San Salvador, Central America. It is situated 15 m. S. of the city of San Salvador. Pop . 15,000.- At the distance of a few miles, a lake of the same name measures 12 m. in length, by 5 m. in average breadth; and in windy weather it a umes a green hue, often casting on its shores vast quantities of dead fish. Coke, ( kök , ) n. [Probably from Lat. coquo , to cook, to bake, to burn, to parch; Icel, kockr , a cook; Swed. and Goth. kola , to cook ] Mineral coal burned to charcoal, or fo il coal charred and deprived of volatile matter. The most valuable of the secondary products of a gas establishment is C. The best kind is obtained from coal when carbonized in large ma es, in ovens constructed on purpose. In a gas manufactory, the production of C. being of minor importance to the formation of good gas, it is generally of an inferior quality to that made in coke-ovens, where it is the primary, and indeed sole object for which the coal is carbonized. But gas-coke is excellent for many purposes in the arts and manufactures, producing as clear a fire as that of the first quality, though it is neither so lasting nor so free from slag; for domestic use, however, it is unobjectionable, and may be burnt both in the drawing-room and kitchen with economy and comfort. The distinguishing characters of good C. are: First, a clean, granular fracture in any direction, with a pearly lustre, inclining to that exhibited by cast-iron. Secondly, density, or close proximity of its particles, which adhere together in ma es, and a specific gravity of 1-10, or rather higher. Thirdly, when exposed to a white heat, it consumes entirely away, without leaving either slag or ashes. It is invariably the case that the quality of the C. is inversely as that of the gas. The manufacturer must not expect to produce both of the best quality. The proce by which the best gas is made generally leaves the C. light, spongy, and friable, although an increase of quantity is gained; for the simple reason, that the degree of heat and other circumstances required to form perfect C. must be entirely changed when gas of a high specific gravity is to be obtained. Thus large ma es of coal exposed to a red heat in close ve els are acted upon by slow degrees, the external portions preventing heat from penetrating into the interior until most of the bituminous portions are given off in condensable vapor, or as charcoal and free hydrogen; the after products being light carburetted hydrogen, carbonic oxide, and carbonic acid gases. The residue is a carbon of a dense granular composition. -v. a. To convert into coke, as coal.