Year: 1898

page_text: Date of Application, 23rd Dec., 1898-Accepted, 11th Mar, 1899
I, GEORG HANF, of No. 9, Mannheimerstrasse Weinheim 1/Baden, Engine
Driver, do hereby declare the nature of this invention and in what manner the
same is to be peiformed to be particularly described and ascertained in and by
the following statement
The present invention relates to a safety water gauge in which the glass gauge
tube proper is further enclosed in a glass tube which has very thick walls and
which is also jointed steam tight, so that if the gauge tube proper bursts, no
steam nor water will enter the boiler 100m.
The arrangement is also such that
the old glass can be removed, and the new glass can be inserted with the very
greatest rapidity
The accompanying diawings illustrate the safety water gauge which is shown
an elevation as regards its upper half, and in section as regards its lower half.
In the usual open metal case A there is close jointed an tight the thick-walled
glass tube B by means of the sleeve nuts C and the rubber washers The tube B
is kept well in the central axis by means of the cones of the nuts Through
the nuts C there extends the gauge tube proper G which is jointed steam-tight in
the socket of the nut C by means of the iubber washers and the glands d
and the nuts D. e are the screw-theaded nipples which are screwed into the
unions mounted on the boiler and which are secured by means of lock nuts F.
These nipples e are screwed air-tight against the ends of the union nuts D by
means of the nuts E and the washers el It is obvious that in the case of the
glass G bursting, neither splinters nor water noi steam can be blown out of the
glass tube B and into the boiler 100m The glass 18 so thick that the greatest
boiler pressure could not burst it, and there is no reason for its bursting of its
own accord because it is not subjected to great variations of temperature, as it
does not as a general rule come in contact with the boiler water or with steam
The glass might possibly break, but then it would never be able to cause any
injury to the attendants of the engine To remove an old glass, it is merely
necessary to slack back the nuts F, and to take out the entire apparatus Then
the nuts 1 are slacked back, the old glass is taken out, and the new glass is in-
Beited The nuts D are screwed up again and the apparatus thus restored is
replaced between the nuts E, and the latter are screwed up tight. As therefore
the engine driver is not compelled to effect this change of tubes at the face of
the boiler, he is at liberty during this operation to take up a position on the
engine foot plate which will allow him to keep a good look out along the line
There is further the advantage in practice that the ends of the tube G extend
right through the packing washers, and cannot therefore become choked by
the same
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is: :-
(1) A safety water gauge characterized by the fact that the gauge glass

page_text: second glass tube is jointed together with the gauge glass proper in the sleeve
nuts C of the metal casing A, so that in the case of the breaking or bursting of
the glass G, neither splinters nor water noi steam can pass out of the glass B, as
Bet forth
(2) In a safety water gauge as specified in Claim 1, the special form of the
nuts C, characterized by the cone c which holds the glass tube B himly and well
in the central axis of the apparatus, and also characterized by the socket part c
in which the gauge glass proper G is jointed steam tight by means of the rubber
washer glands d, and sleeve nut D, in such a manner that the ends of the
tube G extend right through the packing and consequently caunot become
choked by the same, as set forth
(3) A water gauge constructed substantially as herembefore descubed and
shown.
ROBERT E PHILLIPS, Assoc. M Inst CE., MI. Mech. E,
Chartered Patent Agent,
70, Chancery Lane, London, WC, Associate Agent