ARTIFICIAL a.
icial classification (Science), an arrangement based on superficial characters, and not expressing the true natural relations species; as, "the artificial system" in botany, which is the same as the Linnæan system. -- Artificial horizon. See under Horizon. Artificial light, any light other than that which proceeds fro…
ASHES n.
, and the cheek of flame. Byron. In dust and ashes, In sackcloth and ashes, with humble expression of grief or repentance; -- from the method of mourning in Eastern lands. -- Volcanic ashes, or Volcanic ash, the loose, earthy matter, or small fragments of stone or lava, ejected by volcanoes.
ATMOSPHERIC; ATMOSPHERICAL a.
herical a creature. Pope. Atmospheric engine, a steam engine whose piston descends by the pressure of the atmosphere, when the steam which raised it is condensed within the cylinder. Tomlinson. -- Atmospheric line (Steam Engin.), the equilibrium line of an indicator card. Steam is expanded "down to the atmosphere" whe…
ATOMIC; ATOMICAL a.
of bodies, in some simple ratio, as of one to one, two to three, or some other, always expressible in whole numbers. -- Atomic weight (Chem.), the weight of the atom of an element as compared with the weight of the atom of hydrogen, taken as a standard.