Year: 1898

page_text: Date of Application, 1st Mar., 1898-Accepted, 23rd Apr., 1898

page_text: same layer, such as a¹ from a² or a from a³. I preferably place this insulation so that
the joints in the upper and lower layers will be staggered. The insulation between
the different members of the upper layer is not absolutely essential.
Referring to Figure 4, e is a tap bolt which screws into the upper layer of plates
as a¹ and is insulated from the lower layer as a by suitable insulating compound e¹
cast about the bolt.
Referring to Figure 5, d is a tap bolt which screws into the lower layer of plates
as a and is protected from the upper layer of plates as a¹ by the moulded insulating
compound d¹ cast about the bolt. It is of course obvious that I may, if desired,
use the construction shown in Figure 4 for all the fastenings.
With this form of magnet, it is clear that I entirely avoid the danger of short
circuiting the railway system under the conditions which I have previously set forth.
'At the same time, I do not weaken the magnetic field to any appreciable extent for
the magnetic lines are distributed over such a large surface area, when passing through
the insulator C that the loss is inappreciable.
On Sheet 2 of the drawings, I illustrate another form which my invention may
take. In this form, I provide a plurality of channel iron's A¹, connected by rivets to
continuous wooden blocks C¹ and separated by suitable insulators C2, such as fibre or
mica.
Under some circumstances, this form of magnet might be desirable, for it is very
simple and may be cheaply constructed. It has not, however, as good a magnetic
path as the magnet shown on Sheet 1 and I therefore generally prefer to use the
latter.
It is clear that I am not limited to the particular details described, for I believe
that it is broadly new to provide a magnetic closer having a longitudinal pole which is
substantially continuous magnetically, but discontinuous electrically, and it is my
desire to claim this feature regardless or the particular details of construction by
which it is obtained.
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. A magnetic closer having an extended pole adapted to supply a substantially
continuous magnetic field throughout its length and composed of a plurality of
sections insulated from each other.
2. A magnetic closer having a longitudinal pole adapted to supply a substantially a
continuous magnetic field throughout its length and composed of electrically
disconnected sections.
3. A magnetic closer comprising a plurality of cores and energizing coils for the
same, in combination with continuous members secured to the ends of the cores and
'composed of a plurality of electrically disconnected sections.
4. A pole piece for a magnetic closer composed of adjacent parallel layers, each
layer being composed of a plurality of magnetizable members, the members of
each layer and the adjacent members of different layers being insulated from each
other.
4
5. An extended pole piece for magnetic closers having a plurality of sections arranged 4
in sufficiently close proximity to each other to provide a substantially' continuous
magnetic path, but separated by suitable insulating members.
6. An extended pole piece for magnetic closers, comprising the combination of an
upper magnetizable layer contacting with the cores of the magnet, a centre layer
of insulating material, and a lower magnetizable layer made up of a plurality of
sections separated by suitable insulation.
7. The extended pole piece herein described, comprising the upper and lower
members, each composed of a plurality of iron plates separated by insulators,
and the centre layer composed of a sheet of rubber or other suitable insulating
material.

page_text: 8. In combination, the layer of iron plates a, a³, a²,
insulating material, the second layer of iron plates, a¹, a², a³, .
separated by suitable
similarly separated,
the interposed sheet of insulating material, and insulated tap bolts securing the whole
together.
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C..
Agents for the Applicant.