A New or Improved Film Holder for Lantern Slides and Negatives.
Year: 1892

page_text: Date of Application, 28th Jan., 1892
Complete Specification Left, 1st Mar., 1892-Accepted, 9th Apr., 1892
PROVISIONAL SPECIFICATION.
A New or Improved Film Holder for Lantern Slides and Negatives.
ALFRED WILLIAM SCANLAN 12 Blenheim Road, Bedford Park Chiswick,
London, Middlesex Accountant do hereby declare the nature of this invention to
be as follows :—
The principal feature of this invention is a means of holding loose films of every
description perfectly flat and firm on a transparent support whilst in the carrier of
the optical lantern for exhibiting slides or for enlarging and reducing by artificial
light free from buckling from the heat of the lantern and for holding film negatives
when transmitting daylight for enlarging, reducing &c.-in the stereoscope-and
for various other purposes where it is necessary to hold the film flat.
The film holder is made in two forms viz. A the frame form and C the spring or
clip form A consists of a metal frame barely 8ths of an inch thick on the outside
with opening in the centre and a lap of th inch on each side into which a selected
glass of the thinnest description and perfectly free from colour is permanently
bound at top and bottom-a space being provided to slide in the film and another
loose glass of the same description as that above mentioned (which is bound at the
edges to prevent the film from scratches when being inserted in the holder)-an
opening is provided at the bottom lap to facilitate removal of the film with the
thumb of the left hand. The lantern film previously having a suitable mask stuck
on the gelatine or film side with the two white spots at the top corners is inserted
in the holder, spots downwards, in the same manner as glass slides in the carrier
but with the gelatine or film side in contact with the fixed glass in the holder. The
loose glass is then inserted in its place at the back of the film-thus ensuring the
latter being held tightly in its position between the two glasses. The holder is
then inserted in the lantern carrier open end upward with the white spots at bottom
facing the condenser. The holder is lifted from the lantern carrier in the same way
as glass slides by grasping both glasses between two fingers. It will be observed
that the glasses can easily be cleaned on the four faces when necessary. This holder
can also be used without the loose glass for transmitting daylight or with artificial
light where the heat is not too great. C consists of two glasses bound at edges and
connected together at one end clip fashion which remains partially open into which
the film is inserted and clipped between them-and when pushed into the lantern
carrier closes itself and holds the film firmly. When used for other purposes it is
closed by means of a metal binder fixed at one end.
The accompanying illustrations show the holder A without, and with the film and
loose glass in position; that marked B the thinner form of A, and C the clip form.
The holders can be made any size required.
This invention is also intended to supply the means whereby a collection of
several hundreds of film slides (which being an enormous reduction in weight as
compared with glass slides can be carried in the pocket with ease) with the aid of
two of these holders can be shown in the optical lantern on a screen, with the same
precision and as successfully as glass slides. And the irksome binding of slides is
entirely done away with.
1
ليهم
1
1000

page_text: "
COMPLETE SPECIFICATION.
A New or Improved Film Holder for. Lantern Slides and Negatives.
I ALFRED WILLIAM SCANLAN of 12 Blenheim Road, Bedford Park Chiswick,
London W. Middlesex County, Accountant 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 :-
The film holder is made in two forms as shown in the drawings hereto attached―
viz. the clip form-marked C, and the frame form-marked F. The C form will be
chiefly adapted for film lantern slides. It consists of two specially selected glasses
perfectly free from colour 3 inches square bevelled th inch all round on one side,
bound to a metal frame with openings 24ths inches square clear glass. It is bent
over bringing the glasses together. This holder from the nature of its construction
remains sufficiently open of its own accord to admit the lantern film (which has a
suitable mask stuck on the gelatine or emulsion side with the two white spots at the
top corners); it is then closed by means of a wire catch-and the holder dropped
into the lantern carrier-and lifted from it in the same way as glass slides. With
the aid of two of these holders (C) a collection of several hundreds of film slides
(which being an enormous reduction in weight as compared with glass slides, can be
carried in the pocket with ease) can be shown on a screen by the optical lantern
with the same precision and as successfully as glass slides-a particularly invaluable
aid to lecturers. This holder entirely does away with the condensing of moisture
which too often shows good lantern slides to great disadvantage on the screen-and
dispenses with the irksome binding of slides.
The form marked F which is chiefly made for, and better suited to, larger sizes
for holding film negatives whilst enlarging or reducing by artificial light or when
the film is subjected to considerable heat, consists of a metal frame (with
about 24th inches square opening in the centre showing clear glass) into which a
selected glass of the description before mentioned is permanently bound at top and
bottom the film is inserted gelatine or emulsion side in contact with this fixed
glass the cover glass sliding down at the back of the film holds the latter tight in
its position. The opening provided at the bottom lap of the frame facilitates
removal of the film negative with the thumb of the left hand. This holder will fit
the ordinary carriers made for use of images on glass. This form can also be
adapted for viewing film transparencies in the stereoscope.
A thinner form of F (marked F a) to perform the same functions as F without
the cover glass can be used for transmitting daylight or when the film is not
subjected to any heat which would curl the film-in this holder the film is inserted
with the emulsion side outward or exposed.
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. To supply the means of holding loose films of every description perfectly flat
and firm in a transparent support so that they shall be free from buckling and
protected from injury.
a. When exhibiting lantern slides on films by an expeditious method in the
holder C in the optical lantern.
b. In the holder F when enlarging and reducing from films of various sizes by
photographic means, when the film is subjected to lengthened exposure to
heat and
c. In the holder Fa-which performs the same functions as F-when using
daylight for illuminating or when the film is not subiected to any heat.
A. W. SCANLAN.