- the arms of a
spiral galaxy trace logarithmic spirals. The
second definition includes two
kinds of 3-dimensional
relatives of
spirals: A
conical or volute...
-
Archimedean spiral is
sometimes used to
refer to the more
general class of
spirals of this type (see below), in
contrast to Archimedes'
spiral (the specific...
-
Riess spirals, or
Knochenhauer spirals, are a pair of
spirally wound conductors with
metal balls at
their ends.
Placing one
above the
other forms an induction...
- sub-categories SAm, SBm, SABm); the
prototype galaxy and
namesake for
Magellanic spirals is the
Large Magellanic Cloud, an SBm galaxy. They are
usually smaller...
- Curschmann's
spirals are a
microscopic finding in the
sputum of asthmatics. They are
spiral-shaped
mucus plugs from
subepithelial mucous gland ducts of...
- with
spiral forms, such as in
sunflower seed heads,
these are more
closely related to
Fermat spirals than
logarithmic spirals. A
golden spiral with initial...
-
elements are the same size, the
shape of the
spirals is that of
Fermat spirals—ideally. That is
because Fermat's
spiral traverses equal annuli in
equal turns...
- degrees. However,
although spiral galaxies have
often been
modeled as
logarithmic spirals,
Archimedean spirals, or
hyperbolic spirals,
their pitch angles vary...
- the
width of the
spiral arms,
which is
usually kept constant.
Other choices of
spiral shape can also be used, such as
logarithmic spirals that
satisfy r...
-
central bulge, at the ends of
which the
spiral arms begin. The
proportion of
barred spirals relative to
barless spirals has
likely changed over the history...
