Year: 1887

page_text: Date of Application, 13th July, 1887
Complete Left, 12th Apr., 1888
Complete Accepted, 18th May, 1888
I THOMAS STANLEY of Hyde in the County of Chester, Engineer, do hereby declare
the nature of my invention to be as follows:-
These improvements relate to the construction of Dynamo-Electric Machines whereby
the same are simplified in construction and cheapened in first cost and consist in
constructing the machine with a substantial iron frame enclosing a single pole magnet
and armature in lieu of two poles opposite to each other as heretofore. The armature
is carried in bearings resting upon the frame aforesaid which completely encircles both
the single magnet and the armature.
In this manner I find I can obtain as complete a magnetic field with one limb as is
now obtained with the double limb with the result of a considerable simplification of
the machine and proportionate reduction of cost.
JOHN G. WILSON,
Agent for the Applicant.

page_text: I THOMAS STANLEY of Hyde in the County of Chester, Engineer do hereby declare
the nature of my invention and in what manner the, same is to be performed to be
particularly described and ascertained in and by the following statement :-
This invention relates to a novel construction of Dynamo-Electric Machine in
which there is only one magnetic limb (by preference placed directly over the
armature) to be excited by the current-such limb being enclosed on each side of the
armature by a substantial iron frame. This frame not only constitutes the base to
carry the armature bearings &c. but forms the bottom or opposite pole of the magnetic
field.
On the accompanying drawing I illustrate my improved Dynamo - Electric
Machine Fig. 1 being a front sectional view Fig. 2 an end view and Fig. 3 a plan of
the same.
In all the views a is the cast iron frame rising from the foundation plate or base b.
c is the armature mounted upon the shaft d revolving in the usual bearings e and
carrying the driving pulley d¹.
It will be observed that the iron frame a is of a heavy substantial character and
encloses the one single magnetic limb f which is situated by preference directly over
the armature c. So arranged the frame a not only forms in itself the bottom pole of
the magnetic field but a higher electrical efficiency is obtained seeing that the single
limb requires less exciting power for a given number of lines of force produced
compared with double limbed dynamos as hitherto constructed.
In addition to the advantage of having the magnetic coil thus placed directly at its
work viz. magnetising the armature core &c. simplicity of construction-the number
of separate parts being considerably diminished-and reduction of cost are claimed as
features of this invention.
The quantity of copper wire and other expensive insulating material employed are
also reduced by reason of the one limb being dispensed with. The mechanism being
self contained and all the parts easily accessible repairs can most readily be effected
whilst being driven from the base and with the centre of gravity so low down great
steadiness of driving and durability are also ensured.
These improvements are equally applicable to apparatus for electric-lighting, motors
and other electric purposes.
Having thus particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1st. The improvements in dynamo-electric machines substantially as hereinbefore

page_text: 2nd. The improved construction and arrangement of single limbed dynamo-electric
machines substantially as and for the purposes hereinbefore described and illustrated
on the accompanying drawing.
3rd. In the construction of a dynamo-electric machine the employment of a single
magnetic limb when mounted and operating substantially as hereinbefore described
and illustrated on the accompanying drawing.
JOHN G. WILSON,
Patent Office,
55, Market Street, Manchester,
Agent for the Applicant.