COMBINED DIRECT-ACTION BALANCE SAFETY VALVES
Year: 1860

page_text: LETTERS PATENT to James Henry Bennett, Engineer, residing at 7,
Vanburgh Place, Leith, in the County of Edinburgh, for the Invention
of "COMBINED DIRECT-ACTION BALANCE SAFETY VALVES."
Sealed the 23rd October 1860, and dated the 30th April 1860.
PROVISIONAL SPECIFICATION left by the said James Henry Bennett
at the Office of the Commissioners of Patents, with his Petition, on the
30th April 1860.
I, JAMES HENRY BENNETT, Engineer, resident at 7, Vanburgh Place,
Leith, in the County of Edinburgh, do hereby declare the nature of the
said Invention for "COMBINED DIRECT-ACTION BALANCE SAFETY VALVES," to bo
as follows:-
I place two or more safety valves in such position that they shall be drawn
towards each other by the same resisting force, thereby doubling the effective
area of escape. For this purpose I employ a resisting force, such as Salter's
gauges, or the like thereof, so that the action of the valves shall be reciprocal.
It is not positively necessary that the valves agree in area, but if they do it
will form a check upon their accuracy.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Henry Bennett in the Great Seal Patent Office
on the 27th October 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
HENRY BENNETT, of No. 7, Vanburgh Place, Leith, in the County of Edinburgh,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirtieth day of April, in the year of our Lord One
thousand eight hundred and sixty, in the twenty-third year of Her reign
did, for Herself, Her heirs and successors, give and grant unto me, the
said James Henry Bennett, Her special licence that I, the said James Henry
Bennett, my executors, administrators, and assigns, or such others as I, the
said James Henry Bennett, my executors, administrators, and assigns, should
at any time agree with, and no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for " COMBINED
DIRECT-ACTION BALANCE SAFETY VALVES," upon the condition (amongst others)
that I, the said James Henry Bennett, my executors or administrators,
by an instrument in writing under my, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and cause the
same to be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said James Henry Bennett, do hereby
declare the nature of my said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement, that is to say :-
My Invention consists in placing the valves in such a position that they
shall be drawn towards each other by the same resisting force, thereby doubling
the effective area of escape.
In the accompanying Drawing Figure 1 is a section of my valves, A, A, A,
being the valves; B, the steam passage from boiler; and D, D, D, D, escape
passages for the steam from the lower valves.
Fig. 2 is an elevation of my valves as adapted for locomotive engines, the
section, Figure 1, so far as shown, being taken at the red line a, b. The
letters in both Drawings apply to the same parts. C, C, in Figure 2 are two

page_text: Salter's gunges. It is not positively necessary that the valves agree in area,
but if they do it will form a check upon their accuracy.
I do not confine myself to this precise form or arrangement of the valves.
but claim the action of two or more valves acting reciprocally, as herein
shown.
In witness whereof, I, the said James Henry Bennett, have hereunto
set my hand and scal, this Twenty-fifth day of October, in the year of
our Lord One thousand eight hundred and sixty.
JAS. HENRY BENNETT. (L.S.)