An Improved Pencil for Retouching Photographic Negatives, Bromide Prints, and the like, applicable also for Ordinary Drawing Purposes.
Year: 1891

page_text: Date of Application, 12th June, 1891-Accepted, 18th July, 1891
COMPLETE SPECIFICATION.
An Improved Pencil for Retouching Photographic Negatives,
Bromide Prints, and the like, applicable also for Ordinary
Drawing Purposes.
I EDWARD THOMAS HUGHES, of 38 Chancery Lane, London, in the County of
Middlesex, Patent Agent (a communication to me by Edmund George Kerby, of
154 Longmarket Street, Pietermaritzburg, Natal, South Africa, Gentleman, 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:-
This invention refers to an improved pencil for use in retouching photographic
negatives, bromide prints, and the like, and also for ali ordinary drawing purposes,
and is designed chiefly to reduce the difficulty and time in retouching photographic
negatives, bromide prints, and the like, as by the arrangement of the pencil
hereinafter described, the lead is deposited on the photographic negative or the
like, by the simple direct pressure of the pencil, without any other motion of the
hand being required.
The pencil is also adapted for ordinary drawing work of any description.
And in order that my invention may be more readily understood, I have shown
the same upon the accompanying sheet of drawings, in which
Fig. 1 is a section of a pencil constructed according to my invention, and Fig. 2
is a plan view thereof..
A is the case formed of any suitable material, whether metal or otherwise,
containing a hollow tube or barrel a in which fits the lead a'. A spiral tension
spring a works upon the said tube or barrel a. One end of this spiral spring rests
against a sliding piece B, working inside the case A, while the other end presses
against the butt c of an ordinary pencil-case point C, through which the lead a¹
passes.
C
This butt c also acts as a pivot on which in conjunction with another pivot, the
tube or barrel a turns.
c is a guiding slot formed in the end of the case, through which passes a pin c³
projecting from the pin c.
An adjustable collar D, is provided, as shown, for the purpose of regulating the
automatic motion of the pencil, and also for entirely dispensing with same.
The beforementioned inner sliding piece B is connected to an outer sliding
collar B by means of a screw-threaded or other pin, so that when the sliding
collar B' is slid backward or forward in the slot E, it also moves with it, the
aforementioned inner sliding piece B, against which the end of the spring a²
as aforesaid.
presses
The strength of this spring is regulated or adjusted, by moving the collar B
either backward or forward.
When it is desirable that the spring should be adjusted to a different tension, the
collar B is slid along the slot E, and given a half turn towards the side slots e,
when the aforementioned pin is slid into the desired slot and so keeps the spring a²
at the desired tension.
The aforementioned tube or barrel a has at one of its extremities, a rounded
picce F, which passes through a perforation in the end of the pencil-case, and
which acts as a pivot on which turns the whole tube or barrel a.
When the pencil is to be used as a "stippler" for retouching photographic
negatives, bromide prints, and the like, the collar D is turned to the left, so that it
is in the position shewn in Fig. 2, whereby the pin c² can have free play in the
slot c.

page_text: The pencil has to be held in a vertical position and the point of the lead pressed
directly onto the negative or the like, when by so doing, the tube or barrel a is
caused to revolve, thereby turning with it, the lead a', and so leaving a distinct
mark upon the surface of the article operated upon, without the necessity of any
other motion of the hand being employed, as in the present style of "stippling" and
the like pencils.
In order to use the pencil for ordinary drawing purposes, in which case the
sliding and revolving motions are not required, the collar D is turned fully home to
the right, thereby bringing the shoulder d firmly against the pin c² and preventing
it from sliding in the slot and imparting the revolving motion to the lead tube or
barrel a.
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. In pencils of the kind described, the slot c¹ in which works the pin c² in
conjunction with an adjusting collar D, substantially as described and shown, and
for the purpose set forth.
2. In pencils of the kind described, the adjusting collar D for regulating the
working of the pin 2, in conjunction with the slot c¹ and pin c², substantially as
described and shown and for the purpose set forth.
3. In pencils of the kind described, the outer collar B, inner sliding piece B',
and pin in combination wi̟ the spring a² and slotted part E, substantially as
described and shown, and for e purpose set forth.
4. The arrangements of the various parts to form a pencil for use in retouching
photographic negatives, bromide prints, and the like, applicable also for ordinary
drawing purposes, substantially as described and shown, and for the purpose set
forth.
Dated this 10th day of Tung 1801
HUGHES, SON & Co.,
38, Chancery Lane, London, W.C., Agents for the Applicant.