An Improved Arrangement applicable to Windows and Panes of Glass for Preventing the same being Obscured by Moisture.
Year: 1898

page_text: Date of Application, 25th Nov., 1898-Accepted, 1st July, 1899
An Improved Arrangement applicable to Windows and Panes of
Glass for Preventing the same being Obscured by Moisture.
We, LUDWIG PINNER, Merchant, of 29, Kaiserstrasse, and WILHELM ORNSTEIN,
Foreman, of 38, Alexanderstrasse, both of Berlin, in the Empire of Germany,
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:―
The object of the present invention is to provide an arrangement applicable
to windows of all kinds, but especially suitable for show windows, whereby the
coating of moisture which often obscures the window owing to differences of
temperature is obviated.
The mode of carrying the invention into effect is illustrated in the accompany-
ing sheet of drawings, where,
Figure 1 is a shop window to which the device is applied viewed from the
interior, and,
Figure 2 is a transverse vertical section through the said shop window.
The arrangement is constructed by applying a pipe, such as a, running com-
pletely across the bottom or lower edge of the window. This pipe, however, is
not continuous in cross section, but, as is evident from Figure 2, is provided at
its upper edge with a curved margin or flap c, which deflects air admitted from
underneath against the inside of the window pane.
The pipe a is connected to the exterior atmosphere by any given number of
small pipes such as b, b1, b2.
An air valve d is arranged on the inner side of the window at the top portion
thereof, and like the pipe b, runs entirely across the width of the window. This
air valve or flap serves the purpose of producing or helping to produce an up-
ward current or draught along the whole inner surface of the window pane in
the following manner.
and
The operation of the arrangement hereinbefore described consists therein that
air passes from the exterior atmosphere through the tubes into the pipe
is directed by the flap or edge c against the bottom surface of the interior of
the window and passes upwards over the whole pane and out by the flap or
valve d. By this means the temperature of the two surfaces of the window pane
are rendered nearly equal and therefore the vapour or moisture which is usually
deposited upon these surfaces owing to the differences in temperature between
the exterior atmosphere and the inner part of the pane is avoided. The function
of the air valve d at the top is to exhaust the warm air out into atmosphere
again and therefore to keep a thin current of cool air flowing upwards over the
entire inner surface of the pane.
This device is distinguished from the usual complicated mechanism employed
to prevent the obscuring of window panes by its great simplicity and automatic
arrangement.
It is evident that many other mechanical deviations from this construction

page_text: could be designed but as long as the essential feature of providing mechanism
whereby a cold current of air from the outside is conveyed to the interior surface
of the window pane and likewise conveyed along that window pane and again
exhausted then the principal subject matter of the present invention is present.
In a device of this kind gauze can be stretched over the admission pipes and
similarly over the exit passages of the upper flap or valve. This, of course,
is for the purpose of preventing the penetration of dust or insects. The gauze
can be composed of ordinary woven material or of metallic net-work and may be
of any size or design. If desired metallic perforated sheet iron may be sub-
stituted for the gauze.
Having now particularly described and ascertained the nature of our said in-
vention, and in what manner the same is to be performed, we declare that what
we claim is :-
1. An improved arrangement applicable to windows and panes of glass for
preventing the same being obscured by moisture, consisting in arranging at the
foot of the glass pane an air passage or passages connecting the exterior atmo-
sphere with the interior and arranging a deflecting tube, or its equivalent, so
that a cold stratum of air spreads over the surface of the pane or window on the
inside thereby equalising the temperature.
2. In the improved arrangement applicable to windows and panes of glass for
preventing the same being obscured by moisture as claimed in Claim 1, the
application of an air valve, flap, or its equivalent, to the upper portion of the
window pane so as to preserve an upward Howing current or film of air over the
entire inner surface of the window pane and thereby equalising the outer and
inner temperature.
11
1
T
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.