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May, 1911.
MOTOGRAPHY
91
k Kmks m St
ereopticon
By T. Stanley Curtis*
Handling
A POPULAR form of slide carrier with dissolving stereopticons is that shown in Fig. 1. This carrier is quickly and easily manipulated, and it holds the slide in register as perfectly as any other form of carrier. The mat or mask on a slide is generally very inaccurate, as is shown when one slide is being dissolved into another. This applies more to the low-priced slides used for illustrated songs, etc. The inaccuracy is not exactly in the mat itself but in the careless method of binding the mat between slide and cover glass. It is practically impossible to perfectly register these slMes on the screen without the
manipulating the various adjustments on the upper stereopticon the two pictures may readily be brought into perfect register.
Most slides are marked with a spot or thumb mark in the lower left-hand corner when slide is held upright and facing the operator. For some unaccountable reason a few manufacturers place the spot in a different position. This is extremely confusing, especially when the operator is handed a complete set of shdes at the last moment, when he does not have time to look them over. The professional exhibitor would find it to his advantage to mark each of his
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Some Handy Things for Stereopticon Operatin'g.
use of a supplementary mask in the slide carrier. Such a mask is easily made and fitted into any carrier. The opening A, Fig. 5, should be made about 1-16 inch smaller that that of any of the slides to be used. Two of these masks are finished up to exactly the same size and one is fitted into each silde carrier.
Fig. 4 shows a very convenient registering slide. The circle and crossing lines are scratched on two pieces of gelatine, care being taken to see that the two slides are exactly alike. Each gelatine is bound between two cover glasess. One of these slides may be dropped into each of the slide carriers, and by
*From "The Dissolving Stereopticon" in American Photography.
slides in the manner shown in Fig. 3 with a small white spot or star easily seen in the dim light.
The sketch, Fig. 6, illustrates a handy box which combines a carrying case and slide holder in one. The length of the box will be governed by the number of slides to be carried. It should be long enough to hold the entire number of slides with a piece of straw board between each. The box should be 4 inches in width and 3% inches in height. The slides are placed with their longer dimension across the box in packing them and a piece of straw board goes between each one and its neighbor. When ready for exhibition, the straw board packing is removed