Improvement in Magic Lantern Slide, Carriers, whereby the Slide is Tinted or Colored During Projection.
Year: 1896

page_text: Date of Application, 26th Mar., 1896..
Complete Specification Left, 22nd Sept., 1896-Accepted, 21st Nov., 1896
PROVISIONAL SPECIFICATION.
Improvement in Magic Lantern Slide, Carriers, whereby the Slide
is Tinted or Colored During Projection.
I, ALFRED EDWARD BINGEMANN of Glenholme, Hilltop Road, West
Hampstead, London N.W. Gentleman, do hereby declare the nature of this
invention to be as follows:-
Instead of the single slot which is ordinarily cut in magic lantern slide carriers
to receive the slide, I make two slots or places for the magic lantern slides to
slip into; one directly behind the other; and I provide the back slot (that which
comes nearest the condensing lense) with a slide suitably tinted for the views,
statuary, or photograph that is intended to be projected, the tiuter being inserted
upside down the same as the ordinary lantern slide; which is inserted in the front
Blot; and I make two longtitudinal strips of wood (or metal) of the same thickness;
(length & breadth to suit the various carriers it is applied to) I fasten these strips
one across the top & one across the bottom of the frame portion of the slide
carrier. On that side which would come nearest the condensing lense of the
lantern, when the carrier is in use. Thus forming a gap between the slide.carrier
frame and the lantern itself, next. the condensor; for this gap I make suitable
tinted or colored glasses, which I insert from the side of the lantern, the glasses.
being inserted upside down; thus tinting or coloring the slide projected. And as
in this manner the coloring medium is nearer the condensing lense than the lantern
slide; it does not injure the sharpness of the lantern slide, when the slide is
projected on the lantern screen, as does the means now ordinarily employed.
I find it convenient to make the partition of the two slots draw out, by running
it in a groove, in which case partitions with openings carefully cut circular or
square can be inserted, or changed to form a mask suitable to the lantern slide to
be projected, & I also find it convenient to slope down the top of the slotted part,
so as to make the back slot rise slightly above the front one at the top, as it thus
avoids confusion of the two slots when in work. The gap formed between the
carrier frame, and the lantern by the longtitudinal strips forms some ventilation
between the condensing lense and the slide, thus reducing the likelyhood of burning
a lantern slide as is sometimes now the case, from the concentrated heat of the light
employed in the lantern to project it.
Dated this 26th day of March 1896.
ALFRED. E. BINGEMANN.
COMPLETE SPECIFICATION..
Improvement in Magic Lantern Slide Carriers, whereby the Slide
is Tinted or Colored During Projection.
I, ALFRED EDWARD BINGEMANN of Glenholme, Hilltop Road West
Hampstead N.W. London 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 :-
Instead of the single slot or mortise which is ordinarily cut in magic lantern

page_text: slide carriers to receive the slide, I make two slots or mortises or places for the
magic lantern slides to slip into A & B; one directly behind the other; and
I provide the back slot B or mortise (that which would come nearest the
condensing lens of a lantern when in use) with a slide suitably tinted to give a
morning, noon evening, or other desired effect to the views, statuary, or photograph
intended to be projected. The tinter slide being placed in the back slot B, or
mortise, upside down in similar manner to ordinary magic lantern slides, and the
slide to be projected is placed in the front slot or mortise A. And as the illuminant
passes through the tinter it carries the shades of the colouring through the slide
placed in front of it, to the magic lantern screen; thus tinting or coloring the slide
projected.
And as in this manner the tinting medium is nearer the lantern condensing lens,
than the lantern slide, it does not injure the sharpness of the latter when this is
projected on the lantern screen, as does the means now ordinarily employed
i.e. that of tinting in the nozzle of the front lens.
I find it convenient to make the partition C dividing the two mortises to draw
out, by running it in a groove formed each side D, and about the middle of a
double and suitably sized mortise to accomodate two magic lantern slides in which
case, partitions C made of metal having openings carefully cut, circular, or square,
to suit requirements, can be inserted; or changed; and so form a mask suitable to
the lantern slide to be projected. I also cut down the top E or mouth of the front
mortise, or slot, A, so as to make the mouth of the back mortise B rise slightly
above the front one, as it thus avoids confusion of the two apertures when in work
in darkness.
And I make two longtitudinal strips of wood H, H, or metal, of the same thick-
I fasten
ness; the length and breadth to suit the various carriers it is applied to.
these strips one across the top, and one across the bottom-of the frame. portion of
my lantern slide carrier; on that side which would come nearest the condensing
lens of the lantern, when the carrier is in use thus forming a gap between the slide
carrier frame and the lantern itself, next the condensor, which gap should be of
sufficient width to allow two glasses for coloring to slide in together. This gap
can be also formed during the manufacture of lantern carriers, by shaping the top
and bottom parts of the frame to project sufficiently, on that side of them which
would come nearest the condensor when in use and thus form a suitable For
gap.
this gap I make suitable tinted or colored glasses, cutting them to size of gap, 80
as to allow these glasses to slide in easily. I insert these glasses (one or two)
from the side, upside down, and thus I tint the lantern slide which is held in
mortise in front during projection; without injuring its sharpness on the screen.
I obtain numerous effects of a pleasing nature by using one or two suitably
tinted glasses in this gap, without the likelihood of breaking them by the heat of the
illuminant used in the lantern. This gap formed between the carrier frame and
the lantern also forms a ventilation between the condensing lens and the lantern
slide, thus reducing the likelihood of burning a lantern slide as is sometimes now
the case from the great heat given off by the condensor, during an exhibition.
I make good tinters for ordinary use with my improved carrier, by selecting a
piece of thin clear glass, of a suitable size; this I tint on one side, as desirable for
a certain effect; then I place a mask (one having a large opening), on this tinted
side. I then select a thin cover glass and bind together. The tinter used at the
back of the carrier frame may be plain colored glasses cut to size of gap, or the
oblong tinted glasses ordinarily used for sunrise and other effects in lanterns.
Having now particularly described and ascertained the nature of my inven
tion, and in what manner the same is to be performed, I declare what I claim is.
1. The combination of double mortises or slots, one placed directly behind the
other, and separated by a metal, or wooden, mask C, removable in a groove D
and applied to tinting slides in lantern carriers.

page_text: 2. The back mortise B or slot used for the purpose of holding glass tinters, for
the purpose of tinting a slide held in the front mortise A of magic lantern
carriers.
3. The raising of the mouth of the back slot or mortise above that of the front.
one, to better assist manipulation of the two slots in darkness.
4. The two longtitudinal strips H. H, fixed one at the top, and one at the bottom
of that side of the lantern carrier frame, which comes nearest the condensor when
in use, and there forming a gap for tinting, or for ventilation.
5. The projection of the top & bottom part of the frame H. H. of magic lantern
carriers, for the purpose of forming there on the side which would come against or
nearest the condensor when in use a gap for tinting lantern slides during projection
or for ventilation.
Deted this 22nd day of September 1896.
ALFRED E. BINGEMANN.