A NEW OR IMPROVED MOTIVE POWER ENGINE
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by Herbert Boyd at the Office of the
Commissioners of Patents on the 30th July 1881.
"
HERBERT BOYD, of Weston-Super-Mare, in the County of Somerset, Doctor of
Medicine, Surgeon H. M's 14th Regment Sikhs. A NEW OR IMPROVED MOTIVE
POWER ENGINE."
This Invention relates to certain new or improved construction and operating of
engines for obtaining motive power.
The engine will be worked in a closed circuit between two reservoirs with the
cylinders, the same as in a steam engine, but with lip valves, not slide valves, and
which cylinder is supplied with two reservoirs to equalize the work.
The reservoirs consist of concentrically coiled tubes shaped double tube in
centre.
A tap or two-way cock is used between the condensor and boiler, and is
provided with a winged plug with delivery and exhaust borings or ways opening
into the chambered casing of the cock, whereby the gas or vapour is always
directed into the cylinder in the same direction, no matter front which reservoir
the vapour or gas is supplied.
One of the reservoirs acts always as "a boiler" and the other as a " condensor,"
and alternately with each other, so that boiler becomes condensor, and condensor
becomes the boiler as required.
The change from boiler to condensor, and vice versa, to be effected automatically
either by the action of gravity (the one reservoir containing the fluid being
heaviest), or by difference of pressure in the two reservoirs, a spring stop
preventing the movement before the boiler is exhausted.
The governor will be placed between the delivery and exhaust pipes connected
at each end to one of them, and consists of a cylinder and piston, the head of which
piston is bored out with a valve way and corresponding to the exhaust and
delivery pipes. When the difference of pressure used above a certain point, which
can be regulated by a spring on a rod connected to the piston rod by a cross arm,
direct communication is established between the delivery and the exhaust, at the
same time; the lever connected with the governor piston rod by means of link
action cuts off part of the amount admitted to engine_cylinder at each stroke, and
Price 211

page_text: in this manner any severe strain on the engine is prevented without any direct
escape of gas from the delivery pipe into the exhaust. The governor acting
through the link action cuts off the amount of gas admitted at each stroke into the
engine cylinder, in proportion to the difference of pressure between boiler and
condensor.
The tubes of condensor and boiler are covered with cotton, and the condensor is
to be cooled by the evaporation of water in a current of air produced by a fan.
The water dripping on it to be cooled by means of solution of crystals of a
potash or ammonia salt, surrounding the vessel containing it, as is done in India.
to be
This salt can be recovered by evaporating the water, and the "boiler"
heated by water warmed by the sun or a small lamp, and the gas used will be
either ammonia or carbonic acid, both of which I have tried.
The action of the engine depending on the difference of the temperature of the
two reservoirs containing the gas. In a cold climate it may be more convenient to
heat one reservoir above the temperature of the sun heat, and also at night
artificial heating by a small lamp would probably be required. In a hot climate
like India cooling one reservoir will be sufficient for the purpose. At sea one
reservoir might be artifically heated, while the other was artificially cooled, the
principle being the same in all cases.
The safty valve on the exhaust pipe is arranged by the side of the governor and
connected with a reservoir containing charcoal, and can be weighted to the pressure
the reservoir will stand; should the engine be left exposed to heat, so that both
reservoirs become heated, the excess of gas would escape and be absorded by the
charcoal from which it could be again recovered.