Improvements in or Connected with Steam Generators.
Year: 1887

page_text: Date of Application, 21st Nov., 1887
Complete Left, 27th June, 1888
Complete Accepted, 27th July, 1888
PROVISIONAL SPECIFICATION.
Improvements in or Connected with Steam Generators. 1.
1, JOHN JOSEPH TINKER of 89 Ashton Road Newton-Hyde near Manchester and
in the County of Chester Boiler Maker do hereby declare the nature of this invention
to be as follows:-
My Invention relates to steam generators wherein tubes are used as water passagos
situated in a horizontal or approximately horizontal position and my improvements
have for their object to facilitate the escape of steam formed in the tubes and to
improve the circulation of the water in the boiler...
According to my Invention I make the water tubes larger in diameter or internal
capacity at the ends than at the mid-portion so that there is obtained an inclined
surface from the said mid portion to both ends of the tube.
An incidental advantage is that dirt or sediment is less liable to lodge in these tubes
than in ordinary straight tubes.
The tubes are preferably circular in cross section.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents for the said John Joseph Tinker.

page_text: Improvements in or Connected with Steam Generators.
I, JOHN JOSEPH TINKER of 89 Ashton Road Newton-Hyde near Manchester and
in the County of Chester Boiler Maker 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 relates to steam generators wherein tubes are used as water passages
situated in a horizontal or approximately horizontal position and my improvements
have for their object to facilitate the escape of steam formed in the tubes to improve
the circulation of the water in the boiler and to lessen the liability to dirt or sediment
lodging in the tubes. The accompanying Drawing represents portions of a boiler
shewing in section at Figure 1 one form of tube B made according to my Invention
and at Figure 2 a similar section of another form of such tube-Figure 3 shews a
modification in which the tubes are attached to the boiler flue by welding instead of
by flanges as in the other figures. It is to be understood that they may be used in
any desired number in the boiler. The boiler flue to which the tubes are attached is
marked C in all the figures.
According to my Invention I make the water tubes B larger in diameter or internal
capacity at their ends a a than at their mid-portion b and so that from the said mid-
portion there is towards each end a continually and gradually increasing diameter in one
gentle curve or inclination I may form the tubes by joining truncated cones whose
smaller diameters are joined at the middle of the tube as in Figure 1 or I may make
the tube all in one piece and of a continuous curve as in Figures 2 and 3.
The radius of the curve which I find give most satisfactory results is shewn in the
drawing but I do not limit myself to that particular radius provided that the tube is
formed with an inclination or gradually increasing curve of one gentle sweep sub-
stantially as shewn I prefer to employ tubes circular in cross section but I do not
confine myself to that form.
It will be readily seen that the declination of the lower sides of the tubes will
facilitate the sliding off and removal of any loose mud scale or foreign substance
which might otherwise deposit upon the tubes and that the gentle and continuous
inclination or curve of the tube greatly facilitates the escape of steam from the water
in the tube and owing to the character of the curve or inclination the tubes are not
liable to readily burn out. The tubes B may be fixed in any suitable way to the
boiler flue C for example they may be flanged and rivetted thereto as in Figures 1
and 2 or they may be welded into the boiler flue as shown in Figure 3 which latter

page_text: plan will facilitate the getting of a maximum number of tubes into the flue as it
occupies less room than does the flanged connection.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In or for steam generators water tubes larger in diameter or internal capacity at
each end than at their mid portion and so formed that from the said mid portion there
is towards each end a continually and gradually increasing diameter in one gentle
curve or inclination substantially as and for the purposes hereinbefore described.
Dated this 97th dow of June 1888