IMPROVEMENTS IN THE MANUFACTURE OF GLOBES OR SHADES FOR GAS OR OTHER LAMPS as follows:
Year: 1884

page_text: I JOHN HENRY JOHNSON of 47 Lincoln's Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of said Invention for "IMPROVEMENTS
IN THE MANUFACTURE OF GLOBES OR SHADES FOR GAS OR OTHER LAMPS
as follows:-
"
to be
Hitherto in manufacturing Lamp globes and shades it has been the main object
to make them in such a manner that the light of the flame was dispersed whilst
the body of the flame itself remained invisible within such globes and behind such
shades. In order to attain this invisibility of the flame the globes and shades had
to be made of such a degree of opacity as to essentially decrease the brightness of
the light dispersed through these globes and shades for if the said globes and shades
were made of such a degree of transparency that it would readily allow the light
to pass or penetrate this advantage would be balanced by the defect, that the body
of the flame behind such shade or within such globe would become visible.
This Invention has for its object to so manufacture the said globes or shades that
there is attained the advantage of the light through the globe or shade at the same
time avoiding the visibility of the body of the flame itself through the globe or
shade.
According to this Invention the said globes and shades are manufactured of such
quality of milk or enameled glass that the flame within or behind said globe or
shade would be visible through the glass and the inner surface of such shade or
globe is obscured by any suitable process. The entire surface of the shade or globe
may be blinded or obscured or only that part through which the light passes in a
downward direction the upper part or half of the globe being left in its original
condition that is to say not obscured or blinded. The use of feld spar and fluor
spar is preferred in manufacturing this glass in order to give it the enamelled or
milk glass quality by which substances the enamelled or milk glass does not obtain
such a degree of opacity as if it would if it were manufactured with cryolite. The
Globes and shades manufactured as herein before described will perfectly hide the
body of the flame itself within or behind such globes or shades but they will allow
the light to be dispersed or to pass through to a far greater extent than is the case
with globes or shades as hitherto manufactured.

page_text: "
I, JOHN HENRY JOHNSON, of 47 Lincolns Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of said Invention for "IMPROVEMENTS IN
THE MANUFACTURE OF GLOBES OR SHADES FOR GAS OR OTHER LAMPS and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
Hitherto in manufacturing lamp Globes and shades it has been the main object
to make them in such a manner that the light of the flame is dispersed whilst the
body of the flame itself remains invisible within or behind such Globes or Shades
In order to attain this invisibility of the body of the flame the said Globes and
shades have had to be made of such a degree of opacity as to materially decrease
the brightness of the light dispersed through the said Globes and Shades for if they
were made of a degree of transparency such as would readily allow the light to
pass through or penetrate them this advantage would be counteracted by the
defect that the body of the flame would be visible within or behind such globes or
shades.
This Invention has for its object to so manufacture Globes and Shades, that
there is attained the advantage of the utmost penetration of the light through the
Globe or shade combined with the advantage of avoiding the visibility of the body
of the flame itself through the globe or shade-According to this Invention the
said Globes and Shades are manufactured of such a quality of milk or enamelled
glass that the body of a flame within or behind the globe or shade would be visible
through the glass, and the inner surface of the shades or globes thus made, are
obscured by any suitable process. The entire inner surface of the globe or shade
may be obscured, or only that portion through which the light passes, say in a
downward direction, the other part or half of the globe or shade being left in its
original condition, that is to say, not obscured,-The use of feldspar and fluorspar
is preferred in manufacturing this glass, in order to give it the enamelled or milk
glass quality because when these substances are used the enamelled or milk glass
produced does not attain such a degree of opacity as it would attain if it were
inanufactured with cryolite. The globes and Shades manufactured as hereinbefore
described will perfectly hide the body of the flame itself within or behind such
globes or shades, but they will also allow the light to be dispersed or to pass
through to a far greater extent than is the case with globes or shades as hitherto
manufactured.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
The manufacture of Globes or Shades for Gas and other lamps by first forming
the said Globes or Shades of such a quality of milk or Enamel Glass that the body
of a flame is visible through it and then obscuring the inner surface or part of the
inner surface of the said Globes or shades substantially as and for the purpose
herein before described.
DOLL
100%