Archive for the 'A-Abscissa' Category

Jan-14th-2009

Abscissa

In a system of plane co-ordinates (see Co-ordinates) the
distance of any point from the axis of ordinates measured parallel to
the axis of abscissas.
In the cut the abscissa of the point a is the line or distance a c.

Fig. 1. AXES OF CO-ORDINATES

Dec-31st-2008

Azimuth Circle

A great circle, whose plane passes through the zenith or point of the
heavens directly overhead; any great circle in whose plane the vertical
at the point of observation is included.
Each celestial body has or determines an azimuth circle.

Dec-31st-2008

Azimuth

The angle between the plane of the meridian and the plane of an azimuth
circle, q. v.

Dec-31st-2008

Axis of Ordinates

In a system of rectilinear right angle co-ordinates, the vertical axis.
(See Co-ordinates.)
Synonym–Axis of Y.

Dec-31st-2008

Axis of Abscissa

In a system of rectilinear, or right angle co-ordinates, the horizontal
axis. (See Co-ordinates.)
Synonym–Axis of X.

Dec-31st-2008

Axis, Electric

The electric axis of a pyroelectric crystal, such as a tourmaline
crystal; the line connecting the points of greatest pyroelectric
excitability.

Dec-31st-2008

A. W. G

Abbreviation for American Wire Gauge, q. v.

Dec-31st-2008

Austral Pole

The north pole of the magnet is thus called sometimes in France; the
austral pole of a magnet is the one which points towards the north polar
regions As unlike magnetic poles attract each other, it is but rational
to call the north-seeking pole of the magnet the south or Austral Pole.
In the same nomenclature the south pole [...]

Dec-31st-2008

Aurora

A luminous display seen in the northern heavens in the northern
hemisphere, where it is the Aurora Borealis, and seen in the southern
heavens in the southern hemisphere, where it is called Aurora Australis,
or indifferently for either, the Aurora Polaris. It takes the form of
pale luminous bands, rays and curtains varying in color. Near the poles
they are [...]

Dec-31st-2008

Aura, Electrical

The blast of air produced at highly electrified points.

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