Improvements in the Centreing Motion of Arc Lamps and Lime Light Jets.
Year: 1897

page_text: Date of Application, 21st Dec., 1897
Complete Specification Left, 21st Sept., 1898-Accepted, 19th Nov., 1898
PROVISIONAL SPECIFICATION.
Improvements in the Centreing Motion of Arc Lamps and Lime
Light Jets.
We, JOHN STUART, Managing Director of Ross Limited, of 111, New Bond
Street, in the County of London, and JoHN HENRY BARTON, of the same place,
Optical Assistant, do hereby declare the nature of this invention to be as
follows:
:-
This invention consists of an improved construction of the centreing motion
of arc lamps and lime light jets by which lateral movement is given to the are
or jet to properly centre the light. The lamp proper is secured to a foot piece
which is mounted so that it can slide laterally upon the base or bed plate.
According to this invention a bearing strip of brass or other suitable material
is secured to the base or bed plate, upon which strip the forward part of the
foot-piece of the lamp bears. At the rear end of the said base or bed plate another
similar strip is placed temporarily for the rear of the said foot piece to rest
upon. The rear part of the said foot piece is provided with a transverse rib
and the base or bed plate is provided with lugs, one situated at each end of the
said transverse rib, the distance between the lugs exceeding the length of the
said transverse rib to an extent equal to the lateral movement to be given to
the lamp. A hole is then bored through the said lugs and transverse rib and
a pin is inserted therethrough, and is secured in the lugs and acts as a rear
guide for the foot piece after the rear strip aforesaid has been removed.
centre pin or post is secured to the base or bed plate and projects through a
lateral slot in the foot piece. Upon the said centre pin or post a head or disc
is mounted this head or disc being preferably provided with a milled edge.
It carries at its underside a pin or teeth which engages or engage with a hole
or slot or with teeth in the foot piece so that when the said head or disc is
turned upon the centre pin or post the foot piece (and consequently the lamp
carried by it) is moved laterally upon the base or bed plate. The said headl
or disc is confined in place and the foot piece held down upon the front bearing
strip by placing a cap on the projecting end of the centre pin or post so that
the lower edge of the said cap rests against the upper part of the head or dise
and then a transverse hole is bored through the cap and centre pin or post and
a cotter pin is driven therein to secure the parts in place.
Dated this 21st day of December 1897
A
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in the Centreing Motion of Arc Lamps and Lime
Light Jets.
We, JOHN STUART, Managing Director of Ross Limited, of 111, New Bond
Street, in the County of London, and JOHN HENRY BARTON, of the same place,
Dine Rd1

page_text: Optical Assistant, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement:.
-
This invention consists of an improved construction of the centreing motion
of are lamps and lime-light jets by which lateral movement is given to the arc
or jet to properly centre the light. In describing the invention we will refer
to the accompanying drawings in which Figure 1 represents a longitudinal sec-
tion of the apparatus, Figure 2 a corresponding plan, Figure 3 a separate plan
of the foot piece to which the arc lamp or lime-light jet is secured and Figure 4
an underside view of the head or disc forming part of the apparatus. The lamp
proper is secured to a foot piece A by any suitable means such for instance as
screws screwing into the screwed 'holes the said footpiece A being mounted
so that it can slide laterally upon the base, or bed-plate B. According to this
invention a bearing strip B2 of brass or other suitable material is secured to
the said base or bed-plate, upon which strip the forward part of the foot-piece A
of the lamp bears. At the rear end of the said base or bed-plate another similar
strip is placed temporarily (during construction) for the rear of the said foot-
piece to rest upon. The rear part of the said foot piece A is provided with a
transverse rib A2 and the base or bed-plate B is provided with lugs 13 one
situated at each end of the said transverse rib A² the distance between the lugs
exceeding the length of the said transverse rib to an extent equal to the lateral
movement to be given to the lamp. A hole is then bored through the said
lugs B3 and transverse rib A2 and a pin D is inserted therethrough and is secured
in the said lugs B3 by a screw d and acts as a rear guide for the foot piece A
after the rear strip temporarily used as aforesaid has been removed.
pin or post E is secured to the base or bed-plate B and projects through a lateral
slot A in the foot piece. Upon the said centre pin or post E a head or disc F
is mounted this head or disc being preferably provided with a milled edge.
It carries at its underside a pin f (see Figure 4) or teeth which engages, or
engage, with a hole, or slot a² or with teeth in the foot piece A so that when
the said head or disc is turned upon the centre pin or post E the foot piece A
(and consequently the lamp carried by it) is moved laterally upon the base or
bed-plate B. The said head or disc F is confined in place and the foot piece
held down upon the front bearing strip B2 by placing a cap G on the projecting
end of the centre pin, or post E so that the lower edge of the said rests
cap
against the upper part of the head or disc F and then a transverse hole is
bored through the cap G and centre pin or post E and a cotter-pin g is driven
therein to secure the parts in place.
A centre
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
A centreing motion for are lamps and lime-light jets consisting of the con-
struction and arrangement of parts as herein before described and illustrated in
the accompanying drawings.