IMPROVEMENTS IN EXHAUSTING THE BULBS OF INCANDESCENT ELECTRIC LAMPS OR OTHER ARTICLES "
Year: 1882

page_text: LETTERS PATENT to Nelson King Cherrill of Paris in the Republic of Franco
Engineer for an Invention of " IMPROVEMENTS IN EXHAUSTING THE BULBS
OF INCANDESCENT ELECTRIC LAMPS OR OTHER ARTICLES
"
PROVISIONAL SPECIFICATION left by the said Nelson King Cherrill at
the Office of the Commissioners of Patents on the 22nd November 1882.
NELSON KING CHERRILL of Paris in the Republic of France Engineer
"IMPROVEMENTS IN EXHAUSTING THE BULBS OF INCANDESCENT ELECTRIC LAMPS
OR OTHER ARTICLES
"
My Invention relates to improvements in the means employed to obtain the
vacuum needed for incandescent electric lamps or other purposes and has for its
object to produce a very high or perfect vacuum with rapidity and convenience.
Hitherto the exhaustion of the air from the said bulbs has been effected by
mercurial pumps such for example as the Sprengel pump. According to my
invention I rely chiefly upon chemical means to obtain the vacuum using a pump
more as an auxilliary than as the sole means of securing the vacuum.
In carrying my said Invention into effect I pass into or form in the bulb or
article in which the vacuum is to be formed a gas which when caused to issne
therefrom will pass into over or through a substance with which it will combine
so that it leaves behind it a vacuum in the bulb or other article and being con-
verted into a non-gaseous form before it reaches the pump (if such be used) the
said pump acts as an auxilliary to the chemical means stated for producing the
vacuum-An an example I may give ammoniacal gas as the gas with which I fill
the bulb or other article and phosphoric anhydride as the substance which I place
in the passage between the said bulb or other article and the pump-On the pump
being set to work the animoniacal gas will be drawn from the bulb or other article
and in passing over the anhydride it will combine therewith leaving behind it
a vacuum in the bulb or other article.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Nelson King Cherrill in the Great Seal Patent Office on the
19th May 1883.
NELSON KING CHERRILL of Paris in the Republic of France Engineer,
"IMPROVEMENTS IN EXHAUSTING THE BULBS OF INCANDESCENT ELECTRIC LAMPS
OR OTHER ARTICLES
"
My Invention relates to Improvements in the means employed to obtain the
vacuum needed for incandescent Electric lamps or other purposes and has for its
object to produce a very high or perfect Vacuum with rapidity and convenience.
Hitherto the exhaustion of the air from the said bulbs has been effected by
mercurial pumps such for example as the Sprengel pump. According to my
Invention I rely chiefly upon Chemical means to obtain the vacuum using a pump
more as an auxiliary than as the sole means of securing the vacuum.
In carrying my said Invention into effect I pass into or form in the bulb or
article in which the vacuum is to be formed a gas which when caused to issue
therefrom will pass into over or through a substance with which it will combine
so that it leaves behind it a vacuum in the bulb or other article and being con-
verted into a non-gaseous form before it reaches the pump (if such be used) the
said pump acts as an auxiliary to the chemical means stated for producing the
Vacuum. As an example I may give ammoniacal gas as the gas with which
I fill the bulb or other article and phosphoric anhydride as the substance which
I place in the passage between the said bulb or other article and the pump. On
the pump being set to work the ammoniacal gas will be drawn from the bulb or
other article and in passing over the anhydride it will combine therewith leaving
behind it a vacuum in the bulb or other article.
The accompanying diagram will serve to clearly illustrate a system mode or
manner in which my Invention may be carried into effect. A represents a bulb
to be exhausted. B the chamber or tube containing the matter which takes up
the gas as it is drawn from the said bulb and c is the pipe or passage communi-
cating between the said chamber and the said bulb; d is the pipe or passage
leading to the pump. Gas as aforesaid being placed or formed in the bulb and
the pump set to work the said Gas is thereby drawn into the chamber B and
combines with the matter therein, leaving behind it a vacuum in the bulb.
Having now described and particularly ascertained the nature of my said
Invention and the manner in which the same is or may be used or carried into
effect I would observe in conclusion that what I consider to be novel and original
and therefore claim as the Invention secured to me by the herein before in part
recited Letters Patent is :-
1 Creating a vacuum in the bulbs of incandescent Electric lamps or in other
articles by placing or forming therein a Gas which is drawn or passed therefrom
into over or through a substance with which it will combine and leave behind it
a vacuum in the bulb or other articles as hereinbefore described.
2nd In creating a vacuum in the bulbs of incandescent electric lamps or other
articles the employment of ammoniacal gas in connection with phosphoric anhydride
as hereinbefore described.
In witness whereof I the said Nelson King Cherrill have to this my
Specification set my hand and Seal the Eighth day of May One thousand
eight hundred and eighty three.
NELSON K. CHERRILL. (L.S.)