Boiler Alarm and. Water Indicator.
Year: 1885

page_text: Boiler Alarm and. Water Indicator.
I, JOHN THEAKSTON ROBSON Engineer & Iron Merchant of the Royal Exchange
Middlesborough do hereby declare the nature of my invention for AN APPARATUS
OR MACHINE FOR THE BETTER ASCERTAINING OF THE STATE OF A STEAM BOILERS
WORKING CONDITION to be as follows:-
My invention will be the better understood by reference to the accompanying
drawing. I claim therein a machine which safe guards an ordinary stationary
boiler in five important points, Firstly it is a safety valve of the dead weight
description Secondly it calls attention to a dangerous state of steam pressure by
whistling. Thirdly it calls attention to a dangerous state of low water by
whistling Fourthly to an over supply of water by the same means, and fifthly it
shows where the level of the water really is by means of the indicator marked "B"
on the drawing and which is situated on the top of the valve chest by preference
I clain the combination of these points in one machine and specifically the
quadrant or eccentric motion used to effect two out of the five results achieved by
the one machine.
JOHN THEAKSTON ROBSON of Royal Exchange Middlesbrough on Tees,
(Profession) Engineer I do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
My invention will be the better understood by reference to the accompanying
drawings and its purpose is for the better safe guarding and ascertaining of an
ordinary steam boilers working condition.

page_text: On the drawings the letter F indicates the section of the shell of an ordinary
Cornish, Lancashire or other stationary boiler.
A hole is cut through this and above is bolted the steam chest G the bolts for
this purpose also carrying the hanger H. This steam chest is provided with a
valve A weighted in a suitable manner by weight marked I.
At the lower end of hanger H is a pin marked J which carries the quadrant cam,
or excentric marked "K" which latter has a rod L passing through it. This rod is
attached to a float at one end and this float is marked B. on small scale drawing,
at the other end of rod L is a counter balance M On top of valve chest G is an
ordinary steam whistle N. The lever O moves on the pin P and is connected to
the rod L by means of the link Q.
The other end of the lever O actuating in turn the rod R which passes through
the boiler shell and so upwards and in turn causes the indicator D to rise and fall
with the motion of the float B The valve "A" has a spindle S dependent from it
and carrying a wheel C at its lower end and it will be evident that should the
quadrant K be turned on its centre by the rising or falling of the float following
the water line so far as to bring the points T. T under the wheel fixed to spindle S,
that the result would be to lift valve "A."
.39
This alarm is intended to act as a boiler safe guard in five different capacities,
In the first place the dead weight valve "A" acts as a small auxiliary safety valve
In the second place should the steam rise beyond what the valve is weighted for
the valve A is lifted and the whistle sounds. In the third place, if the water
falls below safety point, the float B brings the quadrant K into play and by lifting
wheel C allows steam to escape to whistle N, in the fourth place should the boiler
be overfilled thereby running a risk of water going over into cylinders &c &c and
breaking them the float B again actuating quadrant K lifts valve A and whistles as
before. In the fifth place the exact height of water can be seen at a glance by
means of indicator D which is actuated by the float through rods L and R and
lever O and link Q.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed declare that what
I claim is
The combination in one machine as above described of the points as follows, It
is a safety valve of the dend weight description It indicates by whistling when
the water is too low in the boiler It indicates when the water is too high.by
whistling and it shows on the dial or board where the level of the water is at any
time. I claim the combination of these points in the one machine and more
especially the quadrant, cam, or eccentric motion used to effect two out of the five
results obtained.
1000