The Neihart herald. [volume] (Neihart, Mont.) 1890-1901, 1896-08-01
A WINDOW MIRROR.
Transparent From the Inside, but a Look
i-E Glass Outside.

Transparent From the Inside, but a Look
i-G Glass Outside.
y transparent mirror was brought
from Germany to this country re-
Gently by a New York firm, and tho
perploNing properties of tho glass
excited much curiosity. 1t was at
once III demand for many purposes,
and the same firm is now engaged
in importing it in large quantities.
1t is still anovelty, and some screens
made of this glass have been recent
ly placed ON sale at one of the local
stores. They arc probably the first
to be viewed in this city.
The coating is placed on one side
of the glass just the Same a the sill
vering on the mirror and has tho
same properties of rejecting the rays
of light and color, Tho difference,
however, is that when looked at
from the back the coating i, entirely
transparent. To oncsitting indoors
the view without is not obstructed
in the least, but a pedestrian peering
into the window or 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. 1t
was introduced with effect first in a
kTnyr- NN,1- n1,-h .rf,,1A1r DAl5,,l -
the chappies could sit and ogle the
girls and view the passing throng
without being themselves observed.
It's use was also resOrted to in cafes,
where it offered privacy to those
lounging inside, while the latter had
an undisturbed Wow 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 one part by weight of sill.
yer nitrate i'll ten parts by weight of
water and label No. l.. Prepare an
other 10 per cent solution of silver
nitrate, but i'll larger quantity. To
this add ammonia water, drop by
drop, stirring carefully until the pro-
oipitate formed at first is completely
dissolved, and label No. ?. Now add
solution No. / to solution No. Gun
til the odor Of ammonia i no longer
recognizableand 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 - part by weight Of Rochelle
salt III 3Sl parts by weight Of distill-
ed water, boil and to the boiling so.
luton add gradually 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 q perfectly level
surface in a Don at il temperature
of about 25 degrees G. (1r degrees F..
Mix equal parts of No. 3 (thc de-
posting fluid and No. 4 (tho reduc.
ing huid) and pour over the glass.
The glass may, il 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 DO determined by tho judg.
ment of the operator in each case,
and this may be aided somewhat by
observing a piece of white paper be.
low the plate of glass. When II sui
iicient deposit of silver has bcel
made, and much loss is required tl1al
for an ordinary mirror, pour off the
silvoring liquid and rinse thoroughly
with tho distilled water and stant
the mirror on edge to dry, coat The
silyered side with solution of color
less shellac in alcohol and finally
frame the mirror with Il backing o
clear glass to protect the mirror sur
face from being scratched.-Phila
delphia Record.