Willmar tribune. [volume] (Willmar, Minn.) 1895-1931, 1913-11-19
VIEW I E: \ nj {: C1R| I: j lam

NEW LEc CTR 6 Ahd
Nitrogen Filled incande scent Lamp
Saves Halt the Cost 81 Current.
as Announcement was made q few
weeks ago that new incandescentI
lamp has been perfected which con-
ssumes only half a watt of electrical
energy against a full watt re auired. BY
the best lamps Of today. The new
nitrogen lamp 3. is really q. tungsten
lamp, filed with nitrogen gas, and Of
high efficiency.
NJ For many years scientists and in
ventors have been trying. to increase
the efficiency Of, the incandescentI
lamp. The most noteworthy achieve
ment was the perfection Of the tung-
5sten flament lamp which gives three
times as much light, Of a better quail
ity, as the old carbon filament lamp
perfected by Edison. This in itself
was a wonderful Improvement, but
the invention J. Of the nitrogen filled
lamp almost equals it so far as high
candle-power lamps are concerned.
New lamps are usually the result
of long and tedious study. Edison
worked for years to produce the first
carbon lamp and sent men securing
the earth for the bamboo to be used
in the flaments. It was years before
the squirted carbon tilament was
found. The carbon remained practi-
cally the same for nearly twenty
years previous to the discovery of the
tungsten lamp. The new nitrogen
lamp was not the result Of accident.
Long and laborious research work in
trio Company was necessary before a
| hint of the new lamp was found. 1t
| was to eliminate the blackening of
the tungsten lamp during its lifetime
that the new lamp was discovered.
Owing to the chemical action of tiny
bit Of water vapor in the vacuum of
the" globe acting upon the metal fila
ment, the minute PARTICLES. of the
tungsten are carried from the fila
ment to the globe, blackening the
lamp It was to remedy this that the
experimenters hit upon the new lamp.
Besides their high efficiency Of but
half watt per candle-power there
are certain features of the new lamps
which may prove of distinct advant-
! age. *.5-"~ -GsS55 , II
-. Color Of the ight-The tempera-
ture Of the filament being several hun
dred degrees higher than that of ordi-
nary tungsten lamps. causes the light
to be of a very much whittier color, so
that it comes closer to daylight than
any other form Of artificial illuminant
except the direct current arc: and the
special Moore tube containing carbon
dioxide. The color is almost exactly
like that which can be obtained for a
few minutes by rubbing an ordinary
tungsten lamp at double it's rated volt
age. - 1s:@ss1@5 y *ss VA, 3
BY the use of special color screens
it is possible to obtain a true daylight
color at an efficiency Of about two
watts per candle, whereas with ordi-
nary tungsten lamps the efficiency
obtained with the proper screens is
ten to twelve watts per candle.
| 2. High intrinsic brilliancy-The in.
trinsic brilliancy is five to ten times
that of the filament of the ordinary
tungsten lamp. This renders it es-
pecially suitable for projection work
!: such as headlights and stereopticons.
Although the intrinsic brilliancy is
less than that of the arc, this differ.
ence is often more than Offset by the
fact that the wandering of the crater
of the arc prevents as sharp focusing
as is possible when the source OF
light is fixed in position. I.
3. Constancy of characteristics dur.
ing life-Because of the freedom from
blackening of the bulb in these lamps
and because the heically wound fila:
ments may be so designed that the
sagging compensates other changes
during life, it is possible to make nj
trogen filled lamps which maintain
their volt-ampere candle-power char
acteristics practically constant during
their whole life. The ultimate failure
of these lamps is due to the breakagc
of the filament. The candle-power is
usually we'll above 80 per cent even
just before failure.