. Inorganic chemistry . rasscup b. The hydrogen mingles with air beforereaching the platinum, which at once inflamesthe mixture, and a match may be lighted at the flame. This ingenious apparatus is nowsuperseded by the lucifer-match. 285. It has already been mentioned thatthe flame of hydrogen is very feebly highest illuminating power, however, may be conferredupon it by introducing into its flame any infusible solid, whichit may raise in temperature. ThesoHd made use of for this purpose isgenerally quick-lime, and the hydrogenis maintained in full combustion bymixing it with oxyg
. Inorganic chemistry . rasscup b. The hydrogen mingles with air beforereaching the platinum, which at once inflamesthe mixture, and a match may be lighted at the flame. This ingenious apparatus is nowsuperseded by the lucifer-match. 285. It has already been mentioned thatthe flame of hydrogen is very feebly highest illuminating power, however, may be conferredupon it by introducing into its flame any infusible solid, whichit may raise in temperature. ThesoHd made use of for this purpose isgenerally quick-lime, and the hydrogenis maintained in full combustion bymixing it with oxygen before kindlingit. This is most easily and safelyeffected by conducting hydrogenthrough one tube, and oxygen throughanother, from separate gas-holders con-taining them. These tubes terminatein a single canal, where they areallowed to mix, and from which theyare conducted by a curved jet ornozzle, which permits the mixed gasesto flow out against a piece of wood-cut (fig. 22) represents a suitable Fig. 22. Inorganic Chemistry. 95 H and O are the tubes conveying hydrogen and oxygen fromgas-holders or bags containing these gases; a, a curved tubeterminating in a small aperture, by means of which the burninggases are directed against the lime; c, spindle to support lime;h, cylinder of quick-lime or limestone. 286. In using this arrangement, the hydrogen is first kindled,and allowed to heat the lime, which communicates to its flamea brick-red colour, owing to the combustion of the metal calcium,of which lime is the oxide. The oxygen is then turned on, whenthe flame becomes much smaller, and changes to a bright whitelight of the greatest intensity. It is the lime in reaUty, however,which evolves the light, the office of the burning gases beingto maintain the solid at the high temperature essential to itsexhibition of luminosity. This limetball light, as it is called,rivals sunlight in purity and brilUancy. It is visible on a clearnight at a distance of nearly
Size: 1312px × 1905px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1800, bookdecade1860, bookidcu31924031265709
