New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1880-01-31
EDISORS LATEST PATENT.
ABSTRACT OF THE SPECIFICATIONS FOR THE ELEC-
TRIO LAMP.

ABSTRACT OF THE SPECIFICATIONS FOR THE ELEC-
TRIO LAMP
Letters patent were granted to Thomas A.
Edison or January 81 for his electric lamp, and
HE TRIBUNE has obtained copy OF the specifications
of which the following is the material portion:
Be 1t know that l. Thomas Alya Edison, OF Menlo
Park NewJersey. United states OF America. have III
nepted an IinprO yenent in electric lamps, and In the
ffetnod OF manufacturing the same cease No lS0) OF
when the following is specification
The oiic OF this invention IL TO produce electric
lamps giving light by incandescence, when lamp" snail
have high resistance so as to allow OF me practical
lghtgy1ng body OF carbon wire coiled or arranged
In manner as 10 offer great resistance to the pass
OF the electric current, and. at the same tne pre-
sent but Slight surface from which radiation can take
placr. The invention further consists III placing such
burner OF great resistance nearly perfect va um,
70 prevent oxydaton aud injury TO the conductor 6y the
atmosphere. The current conducted into the vacuum
bulb through plaliua wires sealed into gasa The
invention further consists in the method OF manuactnr
ing carbon conductors of high resistance so as To be
suitable for giving light by iucandescence.
Heretofore hight by Incandescence has been obtained
rods OF carbon Of one 10 four ohms resistance,
placed IN closed vessels IN which the atmospheric air
has been replaced by gases that DO not combine chem
always been large that their resistance shall mnny
tunes less than tue burner and In general The attempts
of previous have been to reduce the resistance
of the carbon rod. The disadvantages OF following this
practice that a lamp having but one to four ohms
resistance cannot be worked ID graf numbers ID nu
tipe without the employment OF main conductors OF
dimenslons that owing 10 the low resistance
sions good conductors, aud glass globe cannot be
the place where Tile wires pass III
cemented hence the carbon Is consumed, because there
must always perfect vacuum To render the carbon
stable especially when such carbon Is small III mass and
high In electrical resistance.
The use Of gas m the receiver at the atmospheric
pressure although not attacking the carbon serves TO
destroy iI time by aiwasnlpg, the atriiiOn
duced by rapid passage Of the air lgas the
slightly coherent ighyheated surface OF the carbon.
have reversed this practice. have discovered that
a cot on thread, properly carbonzed and placed IN
led glass bub exhausted TO One-mhOnth of at
mosphere offers from hundred 10 i've hundred ohms
resstance 10 the passage OF the current, and that II Is
absolutely stable high temperatures; that If the
thread be coied as a spiral and carbODized, II
fbrous vegetable substance which Will have carbon
residue alter heating a closed chamber be so coed.
as muoa as two thousand ohIns resistance can
be obtained without presenting radiatmg sur
face greater than threesxteentns OF an inch have
carbonizcd aud used cotton and linen thread, wood
spints papers coied IA various WAYS, also ampblack,
and carbon In various forms mixed with tar
and rolled out into wires OF various lengths and diane
tiers.
Mr. Edlson's claims concerning the lamp are indicated
clearly In this specifications though IL Will be under
stood this is only Of many patents granted to
him on electric lighting. the others covering his new
generator, modification of the Sprengel quicksilver
pump for the production of vacuum, and other parts
OF the process The above is believed be the first
statement that Mr.. Edison has made in writing, plain
lug the suDeri0rity claimed FOR ais lamp