IMPROVEMENTS IN TRAMWAY LOCOMOTIVES AND IN CARS FOR THE SAME
Year: 1874

page_text: PROVISIONAL SPECIFICATION left by Leonard Jennett Todd at the
Office of the Commissioners of Patents, with his Petition, on the
1st May 1874.
I; LEONARD JENNETT TODD, of Leith, in the County. of Mid Lothian,
North Britain, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN TRAMWAY LOCOMOTIVES AND IN CARS FOR THE SAME," to be as
follows, that is to say :—
:
This Invention has principally for its object the arranging or com-
bining of the parts of a tramway locomotive in an improved and superior
manner, and also comprises several improvements in detail connected
with tramway locomotives and in passenger cars for working with the
same..
I place my improved locomotive on four coupled wheels with as small
a wheel base as convenient, and these are driven by the usual cylinders.
The engine is made double ended so as to run equally well in either
direction, with duplicate driving platforms and gear at each end, arranged
as described in the present applicant's earlier Provisional Specification,
No. 225, of the present year.

page_text: The brush gear I make movable vertically so that it will at all times
bear equally on the rails, and also that it may be lifted when not
required or when the engine is running backwards. The steam and
hand brake gear of each platform communicates with a central brake
shaft from which the engine brakes are worked, and they also actuate
draw rods at each end of the engine which are attached to the car
brakes. There are the usual entrance rails at each platform, and also
tool boxes, buffers, and draw gear at each end.
A sheet iron casing with side doors shields the engine motion from
sight, and this is also carried up in the centre of the engine and formed
into a double cab over each end, and with the top of this cab the funnel
is flush so as not to be seen.
The boiler is of the accumulater class described in the earlier
Provisional Specification herein-before referred to, and is placed in the
centre of the engine. I improve it by, making the small furnace
concentric with the outer shell and by making it funnel-shaped at the
top where it enters the combustion chamber. There are hanging water
tubes and a fire hole at each side of the boiler. On one side of the
boiler is a double ended coke box, and on the
on the top of which is placed an exhaust driven blowing fan, which
thus drains into the tank, whilst the air discharge is led downwards to
the close ash pan.
other a water tank,
For working heavy inclines I fit my improved tramway locomotive
with an almost central chain wheel connected to a similar wheel on the
car, so that the entire weight can be coupled for adhesion without the
objection of putting a boiler into the passenger carriage itself.
-Those tramway locomotives which have a single pair of drivers and
the engine motion on top of the boiler I improve by placing the
leading end on a bogie, so as to give greater security on curves than at
present.
To fit already existing horse tramway cars for working with locomotives,
or in building. new cars for this purpose, I place two stout beams under
the floor, say about 30 inches apart. These extend a little distance
beyond the end platforms or ladders of the car, and are fitted with
rounded buffer beams which carry the eyes for the usual horse poles.
To the under sides of these beams, and sufficiently far from each axle to
clear the brake gear, I attach strong draw pins, between which and the

page_text: engine draw pins the rigid draw rods extend. I prefer to have each
draw and brake rod always attached to the car, and always projecting
at each end so that either end of the car can be attached to either end
of the engine in less time than the present horses. Below the car draw
5 and brake rods I place guards to prevent the rods at what is for the
time being the tail end of the car from trailing on the ground. Each
cross brake bar of the engine and also of the car I fit with rubber springs
to equalise the strain on all the blocks.