Year: 1887

page_text: Date of Application, 2nd Dec., 1887
Complete Specification Left, 3rd Sept., 1888
Complete Specification Accepted, 26th Oct., 1888
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E. do hereby declare the nature of this invention to be as follows:-
:-
It has been tried for some time, but without success to use an electric lamp in
connection with an accumulator or a battery for velocipedes, but it was found that the
apparatus was too heavy and bulky and that the lamp did not last for a sufficiently
long time.
The object of the present invention is to avoid these disadvantages and to construct
an apparatus which is of very small dimensions and combines compactness and solidity
with great efficacy and gives a beautiful and steady light.
The invention consists in an incandescent lamp in connection with a very small
but very powerful dynamo electric machine worked by the revolving wheel of the
velocipede.
To construct the dynamo as small as possible the poles of the electro-magnet which
is in horse-shoe form are bent inwards over the winding and the bobbin revolves
between these poles in the interior of the horse-shoe. This bobbin consists of a series
of double T plates of iron and insulated from each other round which the wire is
wound lengthwise and it is mounted on a spindle running in bearings formed in brass
supports fixed to the electro-magnet, so that the whole of it forms a very compact and
strong little machine, which is placed in a suitable casing.
On the lower end of the spindle is mounted the commutator consisting of two half
rings of gun metal to which are fastened the wire ends of the bobbin.
Against this commutator press the brushes which are fastened to the pole ends
of the electro-magnet but insulated therefrom.

page_text: The bearings of the spindle are lubricated by means of capillary lubricators
having their reservoirs on the top of the casing and conducting the lubricant to the
bearings through tubes.
The lantern consists of a hollow truncated cone closed at the smaller end with a
suitable plate through which reach the ends of the circuit wires to which the wires of
an incandescent lamp placed in the interior of the cone are suitably attached. The
incandescent lamp is preferably held in position by means of a spiral spring surrounding
the stem of the lamp and interposed between the lamp and the lantern closing plate.
In this lantern is also placed a parabolic reflector though the centre of which
projects the lamp and the front of the lantern is closed by a removable glass dise to
prevent dirt or other foreign matter from entering the lantern, which is fixed to the
handle bar or other suitable part of the velocipede.
The dynamo must be fastened to the velocipede in such a manner that when the
lamp is to burn the small roller mounted at the top of the bobbin spindle can easily
be brought to bear against a suitable part of the wheel of the velocipede.
Dated this 2nd day of December 1887.

page_text: I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E. 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 :-
It has been tried for some time, but without success to use an electric lamp in
connection with an accumulator or a battery for velocipedes, but it was found that the
apparatus was too heavy and bulky and that the lamp did not last for a sufficiently
long time.
The object of the present invention is to avoid these disadvantages and to construct
an apparatus which is of very small dimensions and combines compactness and
solidity with great efficacy and gives a beautiful and steady light.
The invention consists in an incandescent lamp in connection with a very small
but very powerful dynamo electric machine worked by the revolving wheel of the
velocipede.
In the accompanying drawings:
Figs. 14 represent the dynamo electric machine.
Figs. 5-8 represent the electric lamp and its attachments.
To construct the dynamo as small as possible the poles C of the electro-magnet B
which is in horse-shoe forin are bent inwards over the winding A and the bobbin
revolves between these poles (in the interior of the horse-shoe. This bobbin consists
of a series of double T plates of iron D and insulated from each other round which
the wire E is wound lengthwise and it is mounted on a spindle F running in bearings
formed in brass supports M N fixed to the electro-magnet, so that the whole of it
forms a very compact and strong little machine which is placed in a suitable casing.
On the lower end of the spindle is mounted the commutator G consisting of two
half rings of gun metal insulated from each other to which are fastened the wire ends
of the bobbin.
Against this commutator press the brushes J and K, which are fastened to the pole
ends of the electro magnet but insulated therefrom.
The bearings a and b of the spindle F are lubricated by means of capillary lubricators
having their reservoirs d on the top of the casing and conducting the lubricant to the
bearings through tubes e i.
The lantern consists of a hollow truncated cone closed at the smaller end with a
suitable plate or box P, through which reach the ends of the circuit wires h by
means of terminals & and wires formed with hooks r at the end to which the wires

page_text: of an incandescent lamp U placed in the interior of the cone are attached. The
plate P is fastened to the cone by means of a bayonet joint and screws ". The
incandescent lamp is preferably held in position by means of a spiral spring s
surrounding the stem of the lamp and interposed between the lamp and the lantern
closing plate.
In this lantern is also placed a parabolic reflector W through the centre of which
projects the lamp and the front of the lantern is closed by a removable glass disc X
to prevent dirt or other foreign matter from entering the lantern which is fixed to
the handle bar or other suitable part of the velocipede.
The dynamo must be fastened to the velocipede in such a manner that when the
lamp is to burn the small roller F¹ mounted at the top of the bobbin spindle F can
easily be brought to bear against a suitable part of the wheel of the velocipede.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is:-
--
1. A dynamo electric machine comprising an electro-magnet such as B in horse-
shoe form, the poles C of which are bent inwards over the winding thus making the
machine of very small dimensions, the bobbin revolving between the poles substantially
as described and illustrated in the accompanying drawings.
2. The construction of the bobbin of a dynamo electric machine of double T plates
of iron insulated from each other for the production of an extra strong current
substantially as described and illustrated in the accompanying drawings.
3. The lantern comprising the plate or box P carrying the incandescent lamp, a
parabolic reflector W, the hollow truncated cone and glass plate X, the last three
parts being easily detached from the plate or box P to replace the incandescent
lamp and at the same time preventing dirt or other foreign matter from entering the
lantern substantially as described and illustrated in the accompanying drawings.
Dated this 3rd day of September 1888.