Atmospheric At`mos*pher"ic, Atmospherical At`mos*pher"ic*al, a. [Cf. F. atmosph['e]rique.] 1. Of or pertaining to the atmosphere; of the nature of, or resembling, the atmosphere; as, atmospheric air; the atmospheric envelope of the earth. [1913 Webster]

2. Existing or occurring in the atmosphere. [1913 Webster]

The lower atmospheric current. --Darwin. [1913 Webster]

3. Caused, or operated on, by the atmosphere; as, an atmospheric effect; an atmospheric engine. [1913 Webster]

4. Dependent on the atmosphere. [R.] [1913 Webster]

In am so atmospherical a creature. --Pope. [1913 Webster]

{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'' when its pressure is equal to that of the atmosphere. (See {Indicator card}.)

{Atmospheric pressure}, the pressure exerted by the atmosphere, not merely downwards, but in every direction. In amounts to about 14.7 Ibs. on each square inch.

{Atmospheric railway}, one in which pneumatic power, obtained from compressed air or the creation of a vacuum, is the propelling force.

{Atmospheric tides}. See under {Tide}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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