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  Dissolving views (part 1)

This particular method of exhibiting magic lantern slides involves the employment of two or more lanterns, placed either side by side, or one over the other. The lanterns must be so arranged that their optical axes converge, thus producing coincident discs of light on the screen. A mechanism on or in front of the lantern makes the projection of the first image disappear while the second appears. The fade in and fade away of the images can also be achieved by controlling the illuminant of the lanterns. Later biunial lanterns (one unit on top of another) were used and eventually triple lanterns or triunials.

Especially in combination with mechanical slides very impressing effects can be produced.
Sometimes the images are unrelated, but mostly there is a relation, for example an identical scene at daytime and at night. Thus subtle and surprising effects could be presented. 

One popular example of a painted dissolving set was 'The soldiers dream': a soldier lies sleeping on the battlefield, while changing scenes of memories of home appear above his head. A more common effect achieved by this means is the change from day into night or summer into winter.

From the early 20th century, dissolving views became less common as motion picture films began to provide more sophisticated effects. In film the common used in and out fades and cross fades are developments of the same visual effect. 

Springtime
with flowers blooming.

the slides Autumn
with leaves falling.

the lantern This beautiful double lantern is possibly made by one John F. Hand (the name on the shield is difficult to read).
 Such a double lantern, also called a biunial lantern, is fitted for the highest class exhibition purposes.

As the word bi-unial indicates the lantern really consists of two in one. There are two optical systems and two jets, one being placed above the other. This position is for the convenience of the lanternist, so that he can manage both lanterns without moving from the position in which he stands. A triple or triunial lantern consists of, as you may guess, three lanterns, placed above each other.

Size 26 x 26 x 12 inches (65 x 65 x 30 cm). Optical lenses from Darlot (Paris). ca 1890.



The arrangement of the lanterns in which the two systems are placed one over the other in stead of side by side, only became possible with the adoption of limelight illuminants. In those days the control of the illuminant for biunial and triple lanterns was a risky and difficult occupation. The light in one lantern had to be turned up to its full height before that in the other began to diminish. To divide the gas to the burners, a dissolver, a system of dissolving taps, was used.

Lanternists of today have an easy time: they mostly use halogen lamps in their biunials, controlled by an electronic dimmer.

On the lantern was always a provision to  adjust the lenses to make sure that the projected images perfectly coincided. That way one picture could merge imperceptibly into another. In this case the adjustment is achieved by canting the upper lantern to the front.

'OPTIMUS' 
PAIRS OF LANTERNS FOR DISSOLVING.

 

 

The older lanterns were provided with a mechanical dissolving arrangement consisting of a couple of metal screens, each fitted with sharp notches on one edge. By a simple lever arrangement these 'fans' were so moved that while one gradually covered the lens of the right hand lantern, the other uncovered the lens of its neighbour. Alternatively the brass discs on the front of the lens barrels could be swivelled, one being manipulated by each hand.

With the introduction of gas dissolvers for the gas supply, dissolving could be achieved by increasing the flame of one limelight burner as another was reduced.

Photo left: This mechanical dissolve control has been manufactured by "Service des Projections Lumineuses de la BONNE PRESSE", 5 rue Bayard, Paris 8e, L'UNIVERSEL in the 1900's. This article is patented: S.G.D.G.
 

 

In later years, particularly where a triunial was used, it became possible to add further effects. The windows in a building could gradually become illuminated by using a slide that featured only the glowing windows and was otherwise entirely black (see: Life models, slide 3). During many dissolving views suddenly some snow began to fall. This impressive effect was contrived by means of a long strip of flexible opaque material, pierced with tiny holes and wound about two rollers in a light wooden framework. As the strip was passed upwards on to the top roller by turning a little winch handle at the side of the frame, the snow appeared to fall across the scene.

The operator had to take care that the handle was not turned in the wrong direction, which would cause the snow to fall upwards.

the accessories

With the increasing use of unframed glass slides in 3,25 x 3,25 en 3,25 x 4,25 inch formats, slide carriers became necessary. A common, simple form is the duplex carrier for two slides, in which an inner wooden frame slid from side to side.

 


With the aid of a special slide holder, 'Beards Universal Self-centering Eclips Single Lantern Slide Carrier', the slide to be shown next was passed in front of the one being shown. When the latter was withdrawn, the former was pressed into focus by means of a spring.

The whole assembly is 28 cm (11”) long, 11,5 cm (4 1/2") high and 2 cm (7/10”) thick. The slide changer ‘runner’ on the bottom pulls out just over 15 cm (6”). According to the instruction leaflet it is suitable for any size slide from 3 1/4" x 3 1/4" to 4 1/4" x 3 1/4". Carrier has a small insert that says ‘R.R.Beard, Selfcentering Eclipse’ 

the ambience

 

 

In his book 'The Magic Lantern. How to Buy and How to Use it' A Mere Phantom describes a dissolving view as follows:

 

- A noble palace, glowing in the golden beams of a setting sun, stands before us; its walls glittering in their marble purity, filling the imagination like an architectural dream, and forming the centre of a lovely landscape, with a background of majestic mountains, at the foot of which a limpid stream runs at its own sweet will, the cerulean heavens shedding a charm over all that makes us think of "a better land;" when lo ! a gradual indistinctness appears, the "insubstantial pageant fades ;" the glow is gone ; a grey vapoury atmosphere succeeds ; the river is ice ; the trees are bare and leafless ; the meadows and gardens white and flowerless ; our spirits fall. But now the skaters appear on the scene ; the snow falls, too, at first slightly, then heavily, and the scene is half obscured, when once more appears the enchanted palace, the everlasting hills, the beauteous landscape, and the blue sky ; and when this scene disappears, we go away filled with delight, and wondering HOW the charm was wrought. -

 

 the result


More splendid dissolving view sets......

 

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Last update: 07-02-2019.
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