This dif
ficulty most apparent when there are only
a few lamps circuit.
NIKOLA TESLA, SMILJAN LIKA, AUSTRIA-HUNGARY, ASSIGNOR THE
TESLA ELECTRIC LIGHT AND MANUFACTURING COMPANY, RAHWAY,
NEW JERSEY.
15 The objects invention are prevent
the frequent vibrations the movable elec
trode and flickering the light arising there
from, prevent the falling into contact the
electrodes, dispense with the dash-pot,
20 clock-work, gearing and similar devices
heretofore used, and render the lamp ex
tremely sensitive, and feed the carbon al
most imperceptibly,and thereby obtain very
steady and uniform light. (Xo model. 65
After this the carbon-rod holder released by
the action the feed mechanism,so feed
the carbon and restore the arc its normal
length.
Application filed March 30,1885. combine two electro-mag
nets—one low resistance the main or
lamp circuit, and the other comparatively
high resistance shunt around the arc—a
movable armature -lever, and novel feed 55
mechanism, the parts being arranged that
in the normal working position the arma
ture-lever the same kept almost rigidly in
one position, and not effected even con
siderable changes the electric circuit; but fio
if the carbons fall into contact the armature
will actuated the magnets move
the lever and start the arc, and hold the car
bons until the arc lengthens and the arma
ture-lever returns the normal positiou. Fig.
My invention consists, mainly, the par- 70
ticular manner which the armature com
bined with the magnets and acted upon by
them and the feed-controlling mechanism.United States Patent Office. elevation the
balancing lever and spring, and Fig. 80
section the clamping-tube. lessen this diffi-
35 culty, lamps have been constructed which
the lever armature, after the establishing
of the arc, kept fixed position and can
not vibrate during the feed operation, the feed
mechanism actingindependently; butin these
4c lamps, when clamp employed, frequently
occurs that the carbons come into contact aud
the light momentarily extinguished, and,
frequently,parts the circuit are injured.
N helix fine wire shunt between S5
the positive binding-screw and the negative
binding-screw The upper-carbon holder
S parallel rod sliding through the plates
S' S3of the frame the lamp, and hence the
electric current passes from the positive bind- 9c
ing-post through the plate S2
, carbon-
holder and upper carbon the lower car
bon, and thence the holder and metallic
connection the helix M.
SPECIFICATION forming part Letters Patent No. In
both these classes lamps has been custom-
45 ary use dash-pot, clock-work, equiva
lent retarding devices; but these are gener
ally unreliable and objectionable, and increase
the cost construction. de
tached plan view the pole-pieces and arma
tures upon the friction-clamp, and Fig.
My invention intended effect the de
sired objects and remedy the before-men- 50
tioned defects. plan view the same be
low the line Fig. Serial išTo.
25 that class lamps where the regulation
of the arc effected forces acting oppo
sition free movable rod lever directly
connected with the electrode, all some of
the forces being dependent the strength
30 the current,any change the electrical con
dition the circuit causes vibration and a
corresponding flicker the light. 335,786, dated February 1886.
ELECTRIC-ARC LAMP.
M helix coarse wire circuit from
the lower-carbon holder the negative bind
ing-screw —.
My invention relates more particularly to
those arc lamps which the separation and
feed the carbon electrodes their equiva-
xo lents accomplished means electro
magnets solenoids connection with suit
able clutch-mechanism; and designed to
remedy certain faults common the greater
part the lamps heretofore made. 160,571.
The carbon-holders are any desired char- 95
acter, and insure electric connections the
springs are made use grasp the upper-
carbon holding rod but allow the rod tó
.)
To all whom concern:
Be known that Nikola Tesla, Smil-
jan Lika, border country Austria-Hungary,
have invented certain new and useful Im-
5 provements Electric-Arc Lamps, which
the following specification.
In the drawings, Figure elevation of
the mechanism made use the electric 75
lamp
