Improving the Illuminating Power of Lighthouses and other Places.
Year: 1889

page_text: Date of Application, 23rd Sept.,, 1889
Complete Specification Left, 23rd June, 1890-Accepted. 26th July. 1890
PROVISIONAL SPECIFICATION.
Improving the Illuminating Power of Lighthouses and other
Places.
I, JOHN RICHARDSON WIGHAM, Engineer, of 35 Capel Street, Dublin, do hereby
declare the nature of this invention to be as follows:-
In the. Specification to Letters Patent granted to me on the 28th December 1882
No. 6195, I described an arrangement of superposed lighthouse lenses placed in pairs,
side by side in the same plane with lamps or burners in the focus of each.
My present invention relates to an arrangement by which I so place lighthouse
lenses, whether superposed or otherwise, with regard to each other, that, by the use
of two lights instead of one, a beam of double the ordinary intensity is produced
and received by the observer at shorter intervals at a given speed than can be
obtained from the arrangement described in my aforesaid Letters Patent. I place the
lenses for the juxta-posed lights, whether for one pair of lights or for any number of
pairs which may be used superposed, diagonally to each other so as to make, instead
of a two-faced apparatus as before described, an apparatus with several faces in
accordance with the figures, whether square, hexagon, octagon &c., and by this means
groups of flashes of precise optical duration and recurrence are produced or alternate
periods of light and darkness. The arrangement of mirrors dioptric or otherwise
for throwing back the light and heat on the focal burners described in the aforesaid
Letters Patent may also be applied in connection with this arrangement where
advisable.
Dated this 23rd day of September 1889
COMPLETE SPECIFICATION.
Improving the Illuminating Power of Lighthouses and other
Places.
I, JOHN RICHARDSON WIGHAM, Engineer, of 35 Capel Street, Dublin, do hereby
declare the nature of this invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:
In the specification to Letters Patent granted to me on the 28th December 1882
No. 6195, I described an arrangement for increasing the illuminating power of light-
houses, consisting of superposed lighthouse lenses placed in pairs side by side in the
same plane with lamps or burners in the focus of each.
My present invention relates to an arrangement by which I so place lighthouse
lenses, whether superposed or otherwise, with regard to each other that by the use of
two lights instead of one a beam of double the ordinary intensity is produced and
received by the observer at shorter intervals at a given speed than can be obtained
from the arrangement described in my aforesaid Letters Patent. I place the lenses
for the juxta posed lights, whether for one pair of lights or for any number of pairs
which may be used superposed, diagonally or rectangularly to each other so as to
make, instead of a two faced apparatus as described in the aforesaid specification, an
apparatus with several faces in accordance with the figures required whether square,
hexagon, octagon, &c. and by this means groups of flashes of precise optical duration and
recurrence are produced or alternate periods of light and darkness. The arrange
ment of mirrors dioptric or otherwise for throwing back the light and heat on the
Pine 621

page_text: focal burners described in the aforesaid Letters. Patent may also be applied in con-
nection with this arrangement where advisable.
The arrangement is peculiarly adapted for coloured lights, for instance one of the
faces of the hexagonal light can be used for white light as against two faces of red
light:
Figs. 1 and 2 of the accompanying drawings represent in elevation and plan an
example of hexagonal light, and Figs. 3 and 4 are similar views of a rectangular
light.
In the case of red lights, lenses c (Fig. 2) would be for white light, and lenses d
for the alternate red lights.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, 1 declare that what 1
claim is :-
The arrangement of lighthouse lights substantially as herein described.
ABEL & IMRAY,
Agents for the Applicant.