IMPROVEMENTS IN ELECTRIC LAMPS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by Julius Allmann at the Office of the
Commissioners of Patents on the 16th October 1882. Communicated to
him from abroad by L. Eugen Schwerd. and Ludwig Scharnweber both of
Karlsruhe in the Grand Duchy of Baden, Empire of Germany)
ور
JULIUS ALLMANN of Manchester in the County of Lancaster, Consulting
Engineer and Patent Agent, "IMPROVEMENTS IN ELECTRIC LAMPS (communi-
cated to me from abroad by L. Eugen Schwerd and Ludwig Scharnweber both
of Karlsruhe in the Grand Duchy of Baden, Empire of Germany)
This Invention relates to that type of electric lamp wherein the attraction of
the solenoid directly effects the regulation of the arc. Such lamps are found to
work with greater certainty, the fewer metal parts and the less mass of solenoid
core have to be actuated. The longer the light is intended to last the longer and
heavier become the carbons and carbon holders-and the lamp works with increased
uncertainty.
In the lamp constituting this Invention the arc is directly regulated by the
solenoid but the feeding of the carbon is independent thereof.
In a single arc lamp of the improved form the solenoid is attached to its lower
end and the under carbon holder is provided at its lower end with a disc working
for a comparatively short distance in a cylinder containing fluid, with the object
of retarding to some extent the play of the disc. A balance weight is employed
to raise the lower carbon holder towards the upper. When the lower carbon holder
or core has risen a certain distance corresponding to the portion of carbon consumed
a pin or projection on the holder raises one end of a lever working on a fulcrum
and depresses the other end which by means of a connecting rod releases an
arrangement of gearing at the upper part of the lamp whereby the upper carbon
and holder are allowed to descend towards the lower carbon which in its turn
recedes to its original position. As soon as it attains this position a second pin
or projection on the holder acts on the aforesaid lever and locks the gearing so
that the carbons are brought to rest. The gearing consists of a ratchet wheel
governed by an escapement retarded by any suitable means and preferably by
fluid resistance acting upon a piston working in a cylinder and connected to the
escapement. A pinion on the axis of the ratchet wheel gears with a rack formed
11

page_text: on the upper carbon holder which is thus actuated when the escapement is released
as aforesaid. This arrangement of lamp possesses a two-fold advantage. In the
first place the possible disturbance of the light consequent upon the release of the
gearing can take place only at stated long intervals-and secondly the iron
solenoid core or carbon holder and its attacliments are so light as to render the
regulation of the arc extremely accurate. The lamps may if desired be furnished
with differential coils or bobbins. In a lamp having two differential coils. or
bobbins, one of the bobbins would be covered with comparatively fow coils of
thick wire and the other with many coils of thin wire. The core is connected by
a balance lever and connecting rod with the lower carbon holder. A catch upon
the connecting rod acts upon n levor which releases gearing at the intervals
proper
and allows the upper carbon to fall. An escapement and fly-wheel or balance
lever such as are used in the works of a watch aro or may be employed to regulate
the descent of the upper carbon, or fluid pressure may be used as a retarding
medium in the modification of lamp first described.