IMPROVEMENTS IN TRAMWAY LOCOMOTIVES
Year: 1884

page_text: We; JAMES COMPTON MERRYWEATHER of Greenwich Road S.E. in the county
of Kent, Engineer, and CHRISTOPHER JOHN WALLACE JAKEMAN of Greenwich
Road SE, in the county of Kent, Engineer do hereby declare the nature of our
invention for IMPROVEMENTS IN TRAMWAY LOCOMOTIVES to be as follows:-
This invention relates to improvements in steam locomotives for use on street
tramways.
1. In the condenser placed on the roof of the cab & consisting of numerous thin
tubes carried in tube plates to which are fixed troughs to connect the ends of the
tubes; these run the whole length of the plates but are divided into sections by
diaphragms suitably placed that the exhaust steam shall cross & recross the
condenser in a zig zag direction, in order that all the cooling surface may be
effectively used.
2. The condenser tubes are secured into tube plates by means of ferrules drifted
in, & are curved to allow for expansion.
3. Openings are made in the roof of the cab, for the admission of air to the
condenser from below, and converging plates are arranged under the roof to collect
the air when the engine is running, so that by its increased velocity through the
openings, a cool current of air may be introduced at or about the centre of the
condenser, breaking up the current of warm air travelling horizontally & thus
increasing the efficiency of the condenser.
4. The steam remaining uncondensed (if any) is taken into a separating chamber,
subinerged in a water tank & the condensed water is drawn from the bottom of
this chamber by a pump & returned direct to the boiler.
5. When any uncondensed vapour accumulates in the separating chamber, it is
let out by a special valve loaded to a nominal pressure & passed into a water tank.
6. When the water in the tank gets so heated as to give off vapour, the vapour
is conducted into the smoke-box and it is mixed with the hot air from the tubes,
by a series of combining cones, and thoroughly absorbed so that the emission of
visible exhaust steam is entirely prevented.
7. The self acting governor controlling the speed is driven direct from the axle
by means of gearing without the intervention of bands, cords, or chains, so that it
is not liable to get out of working order through the connection slipping or failing."
8. The governor is arranged to act first on an independent equilibrium throttle

page_text: valve in the main steam pipe, closing it when the maximum required speed is
attained, & should the speed not then be reduced, (as may be the case in descending
inclines) the valve continues to travel after shutting off steam, thus allowing
motion to be imparted to a valve admitting steam to a cylinder actuating the
brake blocks, causing the brake to be applied till the speed is reduced below that
required.
9. The same steam brake valve which is actuated by the governor is also
operated by a pedal or hand-lever so that as it is used in the ordinary course of
stopping it is always free and ready to be acted upon by the governor. The steam
brake valve is constructed without glands, and the valve is circular in form, it is
pivotted in the lever which actuates it so that it is free to rotate as it slides & thus
keep true and tight for a long period. The brakes are also arranged to be worked
by hand when necessary without the use of steam.
10. To protect the moving parts from dust we provide a dust tight casing under
the engine and fit the coupling rod bushes & other moving parts with dust tight
The oil syphons in the coupling rods are fitted with caps covering the
whole of the lubricator so that their removal for oiling ensures all the dust or mud
being removed & prevents the admission of dust to the bearings.
covers.
11. The wheels and all the moving parts of the engine are carefully cased in
with strong plating carried nearly down to rail level, and constructed in such a
manner back & front that obstacles on the road are pushed off instead of being
run over.

page_text: improvements in Tramway Locomotives.
We JAMES COMPTON MERRYWEATHER of Greenwich Road S.E. in the county
of Kent, Engineer, and CHRISTOPHER JOHN WALLACE JAKEMAN of Greenwich
Road S.E. in the county of Kent, Engineer do hereby declare the nature of our
invention for IMPROVEMENTS IN TRAMWAY LOCOMOTIVES 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 steam locomotives for use on street
tramways.
In the condenser A placed on the roof of the cab, and consisting of numerous
thin tubes carried in tube plates, we fix troughs B to connect the ends of the
tubes these run the whole length of the plates but are divided into sections by
diaphragms C, suitably placed so that the exhaust steam shall cross & recross the
condenser in a zig zag direction, in order that all the cooling surface may be
effectively used. The condenser tubes are secured into the tube plates by means
of ferrules drifted in, and are curved to allow for expansion. In the roof of the
cab we cut openings D D for the admission of air to the condenser from below, and
converging platos E E are arranged under the roof to collect air when the engine
is running so that by its increased velocity through the opening a cool current of
air may be introduced at or about the contre of the condenser breaking up the
current of warm air travelling horizontally and thus increasing the efficiency of
the condenser. The steam remaining uncondensed if any is taken into a separating
chamber F submerged in a water tank G & the condensed water is drawn from the
bottom of this chamber. by a pump & returned direct to the boiler. When any
uncondensed vapour accumulates in the separating chamber it is let out by a
special valve H loaded to a nominal pressure & passed into a water tank.
the water in the tank gets so heated as to give off vapour, the vapour is conducted
into the smoke box and is mixed with the hot gases from the tubes by a series of
combining cones J & thoroughly absorbed so that the emission of visible exhaust
steam is entirely prevented.
When
The self acting governor K controlling the speed is driven direct from the axle
by means of gearing L without the intervention of bands, cords, or chains so that
it is not liable to get out of working order through the connection slipping or
failing. The governor is arranged to act first on an equilibrium throttle valve M
on the main steam pipe N, closing it when the maximum required speed is attained,
& should the speed not then be reduced as may be the case in descending inclines
the valve continues to travel after shutting off the steam, thus allowing motion to
be imparted to a valve O admitting steam to a cylinder P, actuating the brake
blocks causing the brake to be applied, till the speed is reduced below that
required.
The same steam brake valve which is actuated by the governor is also operated
by a pedal R or hand lever, so that as it is used in the ordinary course of stopping,
it is always free, and ready to be acted upon by the governor.
The Steam Brake valve O, shown enlarged in fig. 1 is constructed without
glands, and the Valve 1 is circular in form. It is pivotted on the lever 2, working

page_text: in the cone 3, and held in position by the spring 4, so that it is free to rotate as it
slides and thus keeps true and tight for a long period.
The brakes are also arranged to be worked by hand when necessary without the
use of steam. To protect the moving parts from dust we provide a dust tight
casing S under the engine & fit the coupling rod bushes T and other moving parts
with dust tight covers. The oil syphons in the coupling rods are fitted with caps
covering the whole of the lubricator so that their removal for oiling ensures all the
dust or mud being removed and prevents the admission of dust to the bearings.
The wheels and all the moving parts of the engine are carefully cased in with
strong plating U carried nearly down to rail level & constructed in such a manner, 1
back and front that obstacles on the road are pushed off instead of being run over.
Having now particularly described and ascertained the nature of our inven-
tion & in what manner the same is to be performed, we declare that what we
claim is
1. The construction of the condenser, substantially as & for the purposes
Bet forth.
2. The general disposition of the parts, substantially as & for the purposes
set forth.
3. The construction of the steam brake valve, substantially as & for the purposes
set forth.
4. The method of operating the steam brake substantially as & for the purposes
set forth.
Dated this 7th day of August 1885.