A NEW OR IMPROVED SPEED INDICATOR. FOR MARINE AND OTHER ENGINES
Year: 1885

page_text: :
I LORENTZ ALBERT GROTH K.G.V. Civil Engineer and Proprietor of the Patent
Industrial and Financial Agency 30 Finsbury Pavement London E.C. do hereby
declare the nature of: said invention for A NEW OR IMPROVED SPEED INDICATOR.
FOR MARINE AND OTHER ENGINES a communication to me from abroad by Fridolf
Freon Almquist Constructing Naval Engineer of Stockholm in the Kingdom of
Sweden to be as follows:-
The object of this invention is to control and register the speed of a motor
especially marine engines from any place required..
It is based upon the cataract principle in which a closed air vessel is connected
by a tube at the bottom to a pump containing liquid which it presses into the air
vessel while another tube of the same size conveys it by means of a funnel and
pipe back to the pump The return pipe is provided with a cock by which the flow
can be regulated.
When the strokes of the pump are uniform the liquid will remain at a certain
height in the reservoir or air vessel but if the speed is increased the liquid will rise
and compress the air which by means of pipes are led to indicators in any suitable
position.
The air vessel is enclosed in a cylindrical outer case A cock by means of a
stuffing box and tube ending below the liquid regulates the escape valve by means
of a screw spindle which can thus be operated without any escape of air which
would be noticed by the escape of liquid up the tube on to the lid of the vessel.
In the case of great pressure in the air vessel safety valves are provided with
openings at both ends to prevent accidents.
The air vessel should be placed as near as possible to the pump or be made in
the same piece.
-
An extra air receiver is attached for irregular speeds.
"
By the use of special pumps and sealed indicators the number of strokes per
minute "ahead" or "astern can be seen thus enabling the captain on the bridge
to see if his order has been executed and the number of strokes taken.
1
1
1001

page_text: I LORENTZ ALBERT GROTH K.G.V. Civil Engineer and Proprietor of the Patent
Industrial and Financial Agency 30 Finsbury Pavement London E.C. do hereby
declare the nature of said invention for A NEW OR IMPROVED SPEED INDICATOR
FOR MARINE AND OTHER ENGINES" a communication to me from abroad by
Fridolf Frson Almquist, Constructing Naval Engineer of Stockholm, in the Kingdom
of Sweden and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
The object of this invention is to control and register the speed of a motor
especially marine engines from any spot.
It is based upon the cataract principle in which an open vessel A. Fig. 1. or a
closed air vessel P. Fig. 2. is connected by a tube a at the bottom to a pump B
containing liquid which it presses into the air vessel P while another. tube 6 of the
same size conveys it by means of a funnel D and tube b back to the pump The
return tube is provided with a cock c by which the overflow can be regulated.
When the strokes of the pump are uniform the liquid will remain at a certain
height in the reservoir or air vessel P but if the speed is increased the liquid will
rise and compress the air which by means of pipes & are led to indicators C. in any
suitable position.
Fig. 3. is a modification of this apparatus in which the air vessel P is inclosed
in a cylindrical outer case D. A cock c by means of a stuffing box and
tube fending below the liquid regulates the escape valve by means of a screw
spindle e which can thus be operated without any escape of air which would be
noticed by the escape of liquid up the tube on to the lid of the vessel.
In the case of great pressure in the air vessel, safety valves are provided with
openings at both ends to prevent accidents.
The air vessel should be placed as near as possible to the pump or be made in
the same piece.
An extra air receiver is attached for irregular speeds.
"
"
By the use of special pumps and scaled indicators the number of strokes per
minute "ahead
"
or astern can be seen thus enabling the captain on the bridge
'to see if his orders have been executed and the number of strokes taken.
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
1st The apparatus for indicating the speed of marine engines consisting of
closed air vessel P, pump B, supply tube a return tube b, funnel D, regulating

page_text: cock c, air tube d, and indicator C as herein before described and illustrated in
Fig. 2 of the drawings.
2nd The modification shown in Fig. 3 in which the air vessel P. is enclosed in
an outer cylindrical vessel D the overflow valve being regulated by a spindle e
passing through a stuffing box in the cover, and an internal pipe the lower end of
which is below the level of the water as hereinbefore described.
Dated the 25th day of October 1884