Improvements in Electric Arc Lamps.
Year: 1893

page_text: -Date-of-Application, 25th_Jan., 1893
Complete Specification Left. 25th Oct.. 1893-Accepted, 16th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Electric Arc Lamps.
I FRANK GODFREY LOTT of 139 Edgware Road, in the County of Middlesex,
Electrician, do hereby declare the nature of this invention to be as follows:-
According to this invention I connect the top of the solenoid to the inside upper
portion of the frame of lamp the wire from the solenoid is continued round a "cut
magnet suitably fixed in lamp such wire is then connected with one of the
main terminals of the lamp and one end of shunt wire is connected with the other
main terminal of the lamp and the other end of shunt wire is connected with the
" cut out so that in the event of the carbon rod hanging up or the carbon breaking
the shunt is immediately opened by means of the "cut out."
out
I place insulating material between the outside and inside of lamp.
The feeding of the carbon rod is controlled by a clutch connected direct with the
core of the solenoid.
BROWNE & Co.,
9, Warwick Court, W.C., Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in Electric Are Lamps.
I, FRANK GODFREY LOTT of 139 Edgware Road, in the County of Middlesex,
Electrician, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
66
According to this invention I connect the top of the solenoid.to the inside upper
portion of the frame of lamp the wire from the solenoid is continued round a cut
out" magnet suitably fixed in lamp such wire is then connected with one of the
main terminals of the lamp and one end of shunt wire is connected with the other
main terminal of the lamp and the other end of the shunt wire is connected with the
"cut out" so that in the event of the carbon rod hanging up or the carbon breaking
the shunt is immediately opened by means of the "cut out."
I place insulating material between the outside and inside of lamp.
The feeding of the carbon rod is controlled by a clutch connected direct with the
core of the solenoid.
.
And in order that my said invention may be better understood I will now refer to
the accompanying sheet of drawings in which :-
Fig. 1 shews elevation of a lamp with outer casing removed so as to shew the
construction.
Fig. 2 is a view to shew more clearly the connections between the magnets.
One end of the main coil u of the lamp is connected to inside frame and then to
cut-out magnet f. back to the main terminal k. One end of the fine wire coil i. is
connected to the cut-out contact h and the other end to the opposite terminal n. the
wire leading from the terminal n. passes through the side rod g. to bottom carbon
holders. The core of the solenoid b. is made in two pieces being insulated in centre
with hard pieces of insulating material a thus preventing any sluggish movement of
the core b. and giving each coil its own core.
The lower portion of core 6 has two arms r. and the arm r. being connected to
the clutch arm p and the arm carries a spiral spring c. of such strength as to
balance the core b. d is an adjustable screw in top of solenoid which acts as a
guide for the carbon rod e. and to adjust the length of the arc.
TD
021

page_text: f is the cut-out magnet provided with a switch v. which closes the circuit through
the fine wire coil i when the current is turned on, the carbon points being together
the current passes through the main coil u. thus causing the core b to be raised
at the same time closing clutch o. on the carbon rod e. raising this latter and causing
the current to pass through the arc.
When the resistance of the arc increases the core 6 will drop and the clutch
arm p. will come in contact with the tripj so as to allow the rod è to slide down to
its proper position thereby keeping the arc in one constant position.
e
By constructing are lamps as above described there is no clockwork or
complicated parts and the frame of the lamp being thoroughly insulated there is no
danger in handling.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
(1.) The improved method of magnetically striking the arc and regulating the
feed substantially as hereinbefore described and shewn on the drawings.
(2.) The improved clutching device substantially as hereinbefore described and
shewn on the drawings.
(3.) The general construction and arrangement of electric arc lamps as herein-
before described and shewn on the drawings.
Dated this 25th day of October 1893.
BROWNE & Co.,
9, Warwick Court, W.C., Agents for Applicant.