SLIDES, CARRIERS, AND EFFECTS 141 



Slipping Slides have a portion of the picture painted upon a 

 separate glass, which can be suddenly drawn along in the frame 

 so as to produce some startling change. To allow of this, 

 such slides have only a wooden edge frame like a slate frame, 

 the picture being painted on an oblong piece of glass contained 

 in this, and the rest blacked out. A familiar example is some 

 figure carrying a dish ; the ' slip ' will draw forward and cover 

 the head, whilst another head appears on the dish. Or figures 

 will change heads, and so on. More seriously, the ' effect ' of 

 an explosion is sometimes done as a slipping slide. 



The Uncovering Slide, as it might be called, is the same 

 thing worked slowly, but may be single or double. Of 

 the single form an example may be cited in the gradual 

 lengthening of a comic figure's nose. A higher type of the 

 double form may be found in the gradual unfolding of a car- 

 nation from the bud, with perhaps the final appearance of a 

 fairy in the centre. In these cases the complete subject is 

 painted on the foundation glass, and carefully fitted blacked 

 screens are gradually drawn away on one or both sides. A 

 flash of lightning is shown in the same way. Or the moon may 

 emerge from behind a cloud, which, with a good dissolving- 

 view ' effect' of moonlight, exactly registered, is very fine. 



Panoramas speak for themselves, the moving parts being 

 painted on a long slip of glass without frame, which is 

 gradually drawn along in grooves over the fixed portion. 

 (In all these movable slides it will be understood that the 

 painting on both pieces of glass must be on the inner surfaces, 

 which are nearly in contact ; else the two could not be 

 tolerably focussed together.) Vessels are often made to 

 traverse a sea-scene in this way, or trains may be introduced; 

 or if the slide is made vertical, a balloon ascent may be shown 

 in the same way. 



A very charming variation of panoramic slides is to have 

 a series of good landscapes painted as a panoramic slip, 

 moving across a mask carefully fitted to coincide with the 



