Improvements in and relating to Gauge Glasses for Steam Generators and the like.
Year: 1896

page_text: Date of Application, 10th Apr., 1896
Complete Specification Left, 6th May, 1896-Accepted, 13th June, 1896
PROVISIONAL SPECIFICATION.
Improvements in and relating to Gauge Glasses for Steam
Generators and the like.
We, JOHN FARQUHARSON M'INTOSH, of the Caledonian Railway Company,
St. Rollox Works, Glasgow, in the County of Lanark N.B. Locomotive Engineer,
DANIEL M'CALLUM, of 21 North Tay Street, Dundee, in the County of
Forfar, N.B. Brassfounder, and ROBERT WATSON, of 31 Hawkhill, Dundee, in
the County of Forfar, N.B. Wine Merchant, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in gauge glasses, the objects being to
provide an intertranspicuous envelope which shall effectually safeguard attendants
and others against accident from steam, boiling water, or flying splinters of glass,
should the gauge glass fracture while subjected to pressure; and to permit of such
envelope being simply and quickly shipped or unshipped when required.
In carrying out our invention we employ a glass envelope whose section is a
major segment of a circle, that is to say it is part of a circular glass tube whose
purpose is to partially surround the gauge glass, and on its inside is another of wire
gauze or other suitable material, that is to say the wire gauze rests against the
glass, but is otherwise independent of it. Such combined envelope is retained in
position by special devices. In one modification the upper fitting which carries the
gauge glass has screwed on to it a cylindrical holder which receives one extremity
of the cuvelope. The lower fitting is provided with a somewhat similar holder,
except that the recess which receives the other extremity of the envelope is
partially cut away in order to permit of such envelope being easily slipped into
position. In order to hold the envelope when shipped a ring is slipped over such
lower holder, the said ring being retained in position by a bayonet joint or other
like device.
In some cases each extremity of the envelope is held in position by the above
mentioned bayonet jointed rings and their appurtenances. The envelope is kept
from turning round when shipped, by a projection on the recess in which such
envelope is.
Dated this 4th day of April 1896.
I
GEO. C. DOUGLAS & Co.,
41 Reform Street, Dundee, Agents for Applicants.
Improvements in and relating to Gauge Glasses for Steam
· Generators and the like.
We, JOHN FARQUHARSON M'INTOSH, of the Caledonian Railway Company,
St. Rollox Works, Glasgow, in the County of Lanark, N.B. Locomotive Engineer,
DANIEL M'CALLUM, of 21 North Tay Street, Dundee, in the County of
Forfar, N.B. Brassfounder, and ROBERT WATSON, of 31 Hawkhill, Dundee, in

page_text: the County of Forfar, N.B. Wine Merchant, 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 :-
This invention relates to improvements in gauge glasses, the objects being to.
provide an intertranspicuous envelope which shall effectually safeguard attendants
and others against accident from steam, boiling water, flying splinters of glass,
should the gauge glass fracture while subjected to pressure; and to permit of such
envelope being quickly shipped or unshipped when required.
And in order that our said invention and the manner of performing or carrying
the same into effect or practice may be properly understood, we have hereunto
appended two explanatory sheets of drawings, in which the same reference
numerals are used to indicate corresponding parts in all the figures - where
shown.
Figure 1. (Sheet 1.) is a partial sectional side elevation of a gauge glass and
mounting.
Figure 2. (Sheet 1.) is a view looking in the direction of the arrow X (Figure 1.);
and
Figure 3. (Sheet 1.) is a part sectional side elevation looking in the direction of
the arrow Y (Figure 1.).
Figures 4. 5. and 6. (Sheet 1.) are cross-sections at A. A. (Figure 1.) B. B.
(Figure 2.) and C. C. (Figure 3.) respectively, while
Figure 7. (Sheet 2.) is an isometric view of the glass envelope and
Figure 8. (Sheet 2:) a view of the wire gauze inner envelope.
Figures 9. 10. 11. and 12. are isometric views of the lower cylindrical holders.
In carrying out our invention we employ a glass envelope 20. whose section is a
major section of a circle, that 'is to say it is part of a circular glass tube whose
purpose is to partially surround the gauge glass 21. and on its inside is another 22.
of wire gauze or other suitable material, that is to say the wire gauze rests against
the glass 20, but is otherwise independent of it. Such combined envelope is
retained in position by special devices. In one modification as illustrated by
Figures 3. 6. 7. 8. 10. and 12, the upper fitting 23. which carries the gauge glass
has screwed on to it a cylindrical holder 24. which receives one extremity of the
envelope 20. The lower fitting 25. is provided with a somewhat similar holder 26,
except that the recess which receives the other extremity of the envelope is
partially cut away, as shown in Figure 12, in order to permit of such envelope
being easily slipped into position. In order to hold the envelope when shipped, a
ring 27, is slipped over such lower holder, the said ring being retained in position
by a bayonet joint, or other like device. In the drawing we have shown the
ring 27. partially split and capable of being tightened by a thumb screw 28.
Rubber washers 29. may be employed to keep the glass envelope from jarring.
In some cases, as illustrated more particularly by Figures 1. 2. 4. 5. 7. 8. 9.
and 11, each extremity of the envelope is or may be held in position by the above
mentioned bayonet jointed rings and their appurtenances, 29" being the kind of
ring we prefer to use and 30. the holder. In the particular illustrations referred
to above, the lower extremity is only shown as fitted with these rings, the
upper extremity being held in a manner similar to that described in the first
modification.
In each modification the envelope is kept from turning round, when shipped, by
a projection 31. on the recess in which such envelope is...
gauge
In the ring 29. there may be a recess 32. its purpose being to permit of the
glass being seen to the bottom. Sometimes, when dealing with comparatively low
pressures the inner gauze wire envelope may be dispensed with, the glass envelope
being in itself a sufficient shield.
The envelope 20. is unshipped by raising the ring 27. or 29" sufficiently to allow
of its lower extremity being withdrawn sideways from its holder, its upper extremity
being then pulled out of its recess.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
An intertranspicuous envelope or shield for the protection of attendants and
others against accident should the gauge glass fracture, consisting of:
(1.) A glass shield, such as 20. in combination with another and preferably inner-
one 22. of wire gauze or other suitable material.
(2.) The combination and arrangement of parts, substantially as described and
illustrated more particularly by Figures 3. 6. 7. 8. 10. and 12.
(3.) The combination and arrangement of parts, substantially as described and.
illustrated more particularly by Figures 1. 2. 4. 5. 7. 8. 9. and 11.
Dated this 24th day of April 1896.
GEO. C. DOUGLAS & Co.,
41 Reform Street, Dundee, Agents for Applicants.
GEO. C. DOUGLAS & Co.,
41 Reform Street, Dundee, Agents for Applicants.