The Neihart herald. [volume] (Neihart, Mont.) 1890-1901, 1896-09-19
A WINDOW r
From the Inside, but q Look.
= ing Glass Outside.

ing Glass Outside.
N Transparent mirror was brought
Germany to this country re-
Gently by a New York firm. and the
p~orplexing properties of the glass
excited much curiosity. 1t was at
once in demand for many purposes,
and the same firm is now engaged
in importing it in large quantities.
1t is still a novelty, and ON Green
made of this glass have been recent
~ placed on sale at one of the local
stores. They are probably the first
to be viewed in this city.
The coating is placed on n side
Of the glass just the same as the sill
vering on the mirror and has the
same properties of rejecting the rays
OF light and color. The difference.
however, is that when looked at
from the back the coating is entirely
transparent. To one sitting indoors
the view without is not INSTRUCTED
iii the least, but a pedestrian peering
into the window OF doorway is greet
ed by his own reflection. The glass
is used largely in lieu of screens
where privacy is desired without OBJ
struction of light from the outside Or
barring the vision of those inside. It
was introduced with effect first in a
Now York club window. Behind it
the chappies could sit and ogle the
girls and view the passing throng
without being themselves observed.
Its use vas also resorted to in cafes.
where it offered privacy to those
lounging inside, while the latter had
an undisturbed view of the street.
The method of securing this effect
is described in a recent number of
The American Druggist. 1t is as fol-
lows:
Dissolve n part by weight of sill.
yer nitrate in ten parts by weight of
water and label No. 1. Prepare an
other 10 per cent solution of silver
nitrate, but in larger quantity. To
this add ammonia water, drop by
drop, stirring carefully until the pre-
cipitate formed at first is completely
dissolved, and label No. 2. Now add
solution No. l to solution No. 2 un-
til the odor of ammonia is no longer
recognizable and the liquid has again
become very turbid. Now add 100
parts by weight of distilled water for
every part of silver nitrate original.
ly used in solution No. 2 and filter
until clear. Label this No. 3. Pre-.
pare q reducing solution by dissolv-
ing g part by weight of Rochelle
salt in 1854 parts by weight of distill-
ed water, boil and to tho boiling So
luton add gradually a solution of
three parts of silver nitrate in ten
parts by weight of distilled water
and filter when cool and label No. 4.
Clean the glass to be coated thor
oughly, lay it on a perfectly level
surface in a oom at a temperature
of about 25 degrees G. (77degrees F..
Mix equal parts of No. 3 (the de-
posting fuid) and No. 4 (the reduc-
ing fuid) and pour over the glass.
The glass may, if preferred, be dip
ped into the solution. The time re-
CURED for the deposition of the layer
of silver of just the correct thickness
has to be determined by the judg-
ment of the operator in each case.
and this may be aided somewhat by
observing a piece of white paper be-
low the plato of glass. When a suf-
ticient deposit of silver has been
made, and much less is required than
for an ordinary mirror, pour off the
.silvering liquid and rinse thoroughly
with the distilled water and stand
the mirror Oh edge to dry, coat the
silvered side with a solution of color
less shellac in alcohol and finally
frame the mirror with q backing O
clear glass to protect the mirror sur
face from being scratched.-Phila-
delphia Record.