IMPROVEMENTS IN REVOLVING LAMPS FOR LIGHTHOUSES AND OTHER PURPOSES
Year: 1882

page_text: LETTERS PATENT to John Trotter of 7 Great Winchester Street Buildings
"
in the City of London for an Invention of "IMPROVEMENTS IN REVOLVING
LAMPS FOR LIGHTHOUSES AND OTHER PURPOSES Communicated to him
from abroad by L. F. Lindberg of Stockholm in the Kingdom of Sweden
PROVISIONAL SPECIFICATION left by the said John Trotter at the Office
of the Commissioners of Patents on the 6th October 1882.
"
JOHN TROTTER of 7 Great Winchester Street Buildings in the City of London
"IMPROVEMENTS IN REVOLVING LAMPS FOR LIGHTHOUSES AND OTHER PURPOSES
[Communicated to him from abroad by L. F. Lindberg of Stockholm in the
Kingdom of Sweden]
This Invention has for its object improvements in revolving lamps for lighthouses
and other purposes.
Above the burner there is at the top of the lamp an agate cup supported by a
frame upon which rests the point of a pivot, to which is attached a frame work of
metal or other material, the sides of which may or may not be enclosed as the
case may be-at the top of this frame, suspended on the pivot, is fixed a series of
blades, so arranged that the heat on rising from the burner, strikes against them
and causes the whole of the outer frame, and anything that may be attached to it,
to revolve about the pivot. The heat rising from below may also be directed by
meaus of blades fixed to the inner frame, so as to form currents which may vary
in their rapidity or direction. In some cases dampers are also introduced beneath
the fans so as to further regulate the rising heat. The inner and outer frames
respectively may have glass or other materials fixed in them so as to stop the light
entirely partially or intermittently. The angles of the fixed and moving blades
are varied according to the speed of rotation required.

page_text: When the lamp is lighted the hot air rises into the collecting box K and striking.
against the fixed blades takes the form of a spiral stream which strikes at a greater
or less angle against the faces of the moveable blades above which causes them to
rotate together with the parts of the apparatus which are attached to them.
After the foregoing description the following explanation will suffice for the
other drawings respectively the same letters representing the same parts.
In the apparatus represented by drawings 4, 5 and 6 two sets of fixed propellers
E E are used placed in a special collecting box K.
The apparatus shewn in Figures 7 and 8 is placed at the side of the main light Z
and is caused to rotate by a special smaller lamp, this apparatus has two occulting
faces M and M and a parabolic reflector P belonging to the light given by the
smaller lamp.
In the apparatus shewn in Figure 9 the revolving portion is carried on a support
formed by the heat collecting box K the upper part of which has a conical shape
and the lower portion the form of a cylinder-this collecting box is fixed to a
ring Qabove the lenses R. The collecting box has in its upper portion the set of
fixed blades E-the rod C is attached to these and supports the conical heat
regulator D and the cup F surrounded with non-conducting material, inside this
cup is the moveable agate concave F¹. The regulator D is furnished at the top
with a circular disc of non-conducting material. This regulator is made in. the
form of a cone for the purpose of directing the stream of warm air towards the
outer and therefore broader faces of the propelling blades. The suspending rods I
are attached to the moveable pivot H and support a carrying frame T from which
four rods I kept in their places by the ring U descend to and support the occulting
cylinder M, in this cylinder there are two openings one of which is filled in with
red glass V.
Having thus described the nature of the said invention and the mode in which
I carry the same into effect I would have it understood that I do not bind myself
to the precise details herein shown and described but I claim:-
First. Revolving lighthouse lamps substantially as described.
Secondly. Lamp apparatus composed of a revolving occulting screen or screens
fixed to propelling blades attached to and supported on a central pivot such
propelling blades being placed above the flame and above stationary inclined
directing blades substantially as described.
In witness whereof I the said John Trotter have hereunto set my hand and
seal this fifth day of April in the year of our Lord One thousand eight
hundred and eighty three.