Year: 1886

page_text: b the cap which screws into a.
c is a screw with conical tap and fitted into b and also into the nut ƒ f.
d is a set screw which prevents the nut f from turning round.
e is the gauge glass.
ff is a nut fitted loose into a and is propelled in a vertical position by the
screw c which tightens the india-rubber ring g. g. and so fastens the glass.
gg is the india rubber ring.
h is the handle which gives motion to screw C.
i is the barrel of the cock connected with which is the screwed branch which
attaches it to the boiler.
jj is a ball valve which works in chamber 8.
k is the plug of the cock by which steam and water is turned on from boiler
this plug is a two-way one having two holes drilled in the centre at an angle of 90
and a vertical hole from the centre to the narrow part of the plug the outlet being
in the plug bottom.
There is also a square hole in the top of the plug into which ? is fitted loosely.
Z is a square connection piece which serves as a coupling to connect k and u
together.
m is the cap which is screwed into the cock barrel which serves as a barrel for
the outer plug u and so makes the cock externally steam tight by the plug k being
propelled in one direction and the plug u in an opposite direction by means of the
spring o.
n is the handle by which the ccck is opened and shut.

page_text: q is the passage by which the dirt is blown out of the glass and from the
passage p p.
Tis the passage by which the water and steam is conveyed from the plug k into
the valve chamber 8 through the passage t to the internal part of nut fand so into.
the glass.
s is a circular valve chamber which also acts as a valve seat for ball ; and a place
of rest when the ball j is not required to act.
t is the passage from valve chambers to the internal part of nut f. f.
The internal parts being shown in fig. 1. 2 and 3 in dotted lines.
u is the plug which forms a connection with the plug / by the coupling l.
vare four slot holes in nut f which allows the steam to pass through and also
prevents the nut from turning round.
Having given a description of the cock we will now describe its working.
In fig. 2 and 3 the cock is shown as at work there being a direct opening between
boiler and glass. If the handle n is lifted in a vertical position it will blow the
boiler passage and glass out and if pressed down in a vertical position the connec-
tion between the boiler will be closed and the blow through pipe closed at the
same time.
In fig. 3 the ball is shown at rest but if the glass should get broken to cause an
outlet of steam or water the ball would instantly travel up the inclined part of the
chamber and so make tight in the narrow part near to t. and remain in that position
until a new glass was put in.
To cause the ball to retire to its place of rest press the handle down to the
bottom the blow through pipe will be open the pressure released and the ball will
fall into its place as shown in fig. 3.
To put in a new glass, unscrew the tap b, take out the set screw d then the
handle cap b screw plug c and nut ff will all lift out together which leaves
nothing then but the broken glass and the india-rubber ring to be taken out.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that
what we claim is :—
1. The plug l.
2. The plug b.