Improvements in Styles for Producing Stencils employed in Reproducing Writings, Drawings, or the like.
Year: 1895

page_text: Date of Application, 19th Feb., 1895-Accepted, 23rd Mar., 1895.
COMPLETE SPECIFICATION.
Improvements in Styles for Producing Stencils employed in
Reproducing Writings, Drawings, or the like.
We, JOSEPH SLADEN, and FREDERICK, WILLIAM LAMBART SLADEN, both
of Ripple Court, Ringwould, Dover, in the County of Kent, 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 :-
In our Specification No. 8625 of 1893 we described means of producing stencils
employed in reproducing writings, drawings, or the like by writing or drawing
with an electrically heated style on sheets of porous paper coated with wax or
other suitable fusible material, so as to fuse the coating and render the sheet porous
along the lines traced by the style.
Our present invention has for its object to economise the expenditure of
electrical energy required for producing the stencil, by improved means of
applying it to heat the style when it is in use, and by automatically stopping the
current when the style is not in use, as we shall describe referring to the
accompanying drawings which, for the sake of clearness are drawn to an enlarged
scale.
Fig. 1 is a longitudinal section of the style and holder, Fig. 2 shews a modified
form of style.
The style shewn in Fig. 1 is a piece of steel or other suitable wire A bent in
the form of a staple and inserted in the end of a holder B which may be of ivory,
wood, ebonite or other material preferably non-conductive of electricity.
Around the limbs of the style A is wound in a number of convolutions a
wire C of low conductivity such for instance as a "platinoid" wire, which is
covered with insulating material, preferably asbestos fibre, which is not injured
should the heat be excessive.
As, however, only a moderate heat is required, silk may be used instead of
asbestos, but in this case the electrical circuit should be provided with an
automatic regulator or indicator of any known kind so as to prevent damage to
the silk by overheating.
The insulated wire C is connected to a pair of conducting wires D D' which
are led along grooves cut in the holder B and connected by flexible wires to a
battery in any convenient situation. These wires may be bare when the holder
is of non-conducting material, but have to be insulated when it is of conducting
material.
One of the wires D is divided and has attached to its ends contact springs E
and F in such a position that, when the style is in use, the finger pressing on a
knob holds the two springs in contact so closing the circuit with the battery, in
which condition the wire becomes heated and heats the style A.
When the style is not in use, the springs E and F' separate, opening the circuit
and so preventing useless expenditure of electric energy.
The style instead of being in the form of a staple as in Fig. 1 may be simply
part of one of the conducting wires made with a rounded end, as shewn in Fig. 2,
the insulated wire C after coiling several times round it being metallically
connected to it.
The conducting wire D' and the parts of D which lead to and from the
springs E and F, instead of being laid in grooves in the holder, may be led along
holes bored in it; or the holder may be tubular, with the wires led along its

page_text: interior. Also the spring F and knob f may be covered with insulating material,
but as only a small amount of electric energy is required, such insulation is not
necessary.
Instead of a single style there may be several carried by one holder, as for
instance five for ruling a stencil for music.
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 :-
1. For producing stencils by fusing a wax or like coating on porous paper, a
style consisting of a holder terminating in a metal wire wound with insulated wire
of low conductivity connected by conductors led along the holder to a source of
electricity, 'substantially as described.
2. In a style, such as is above referred to, a pair of contact springs arranged in
the holder, substantially as and for the purpose set forth.
Dated this 19th day of February 1895.
ABEL & IMRAY,
Agents for the Applicants.