【化】 火管锅炉

Tubular \Tu"bu*lar\, a. [L. tubulus, dim. of tubus a tube, or
pipe. See {Tube}.]
Having the form of a tube, or pipe; consisting of a pipe;
fistular; as, a tubular snout; a tubular calyx. Also,
containing, or provided with, tubes.

{Tubular boiler}. See under {Boiler}.

{Tubular breathing} (Med.), a variety of respiratory sound,
heard on auscultation over the lungs in certain cases of
disease, resembling that produced by the air passing
through the trachea.

{Tubular bridge}, a bridge in the form of a hollow trunk or
tube, made of iron plates riveted together, as the
Victoria bridge over the St. Lawrence, at Montreal,
Canada, and the Britannia bridge over the Menai Straits.


{Tubular girder}, a plate girder having two or more vertical
webs with a space between them.


Boiler \Boil"er\, n.
1. One who boils.

2. A vessel in which any thing is boiled.

Note: The word boiler is a generic term covering a great
variety of kettles, saucepans, clothes boilers,
evaporators, coppers, retorts, etc.

3. (Mech.) A strong metallic vessel, usually of wrought iron
plates riveted together, or a composite structure
variously formed, in which steam is generated for driving
engines, or for heating, cooking, or other purposes.

Note: The earliest steam boilers were usually spheres or
sections of spheres, heated wholly from the outside.
Watt used the wagon boiler (shaped like the top of a
covered wagon) which is still used with low pressures.
Most of the boilers in present use may be classified as
plain cylinder boilers, flue boilers, sectional and
tubular boilers.

{Barrel of a boiler}, the cylindrical part containing the
flues.

{Boiler plate}, {Boiler iron}, plate or rolled iron of about
a quarter to a half inch in thickness, used for making
boilers and tanks, for covering ships, etc.

{Cylinder boiler}, one which consists of a single iron
cylinder.

{Flue boilers} are usually single shells containing a small
number of large flues, through which the heat either
passes from the fire or returns to the chimney, and
sometimes containing a fire box inclosed by water.

{Locomotive boiler}, a boiler which contains an inclosed fire
box and a large number of small flues leading to the
chimney.

{Multiflue boiler}. Same as {Tubular boiler}, below.

{Sectional boiler}, a boiler composed of a number of
sections, which are usually of small capacity and similar
to, and connected with, each other. By multiplication of
the sections a boiler of any desired capacity can be built
up.

{Tubular boiler}, a boiler containing tubes which form flues,
and are surrounded by the water contained in the boiler.
See Illust. {of Steam boiler}, under {Steam}.

{Tubulous boiler}. See under {Tubulous}. See {Tube}, n., 6,
and 1st {Flue}.