146 SCIOPTICON MANUAL. 



LARGE SLIDES A NEW DEPARTURE. To improve the 

 size and brilliancy of a Sciopticon exhibition, the expe- 

 dient, next to perfecting the instrument itself, is to bring 

 into use larger and clearer views. 



A magic lantern picture of the standard size is 3 in- 

 ches in diameter, mounted in a frame 7 inches long by 

 4 inches wide. The new picture is 3 inches in the clear, 

 in a frame 7 inches by 4i inches. 



The new picture having a third more surface, the 

 illuminated disk shows larger in proportion and to very 

 much better advantage. No one seeing an exhibition 

 of the new slides, would willingly select from the old. 



No inconvenience arises from using both kinds in the 

 same exhibition. The larger frame, reaching a little 

 higher than where the spring meets the condenser, 

 slides more smoothly into place. 



Great pains has been taken to get the best subjects 

 with which to inaugurate this new departure, and to have 

 them worked up in the most artistic style. 



MARCY'S EIDOTROPE. Two disks of perforated tin are 

 mounted so that one extends beyond the frame to the 

 right, and the other to the left; and so, not having a 

 common centre, an eccentric revolution is given to each, 

 little by little, when moved by the fingers at either side 

 of the lantern, producing upon the screen a great variety 

 of strikingly beautiful patterns, which may be pleasingly 

 modified by a varying use of the tinters. Its simplicity, 

 however, may be against it, for effects are quite apt to be 

 valued in proportion to their cost and trouble. 



WHEEL OP LIFE. In the English Wheel of Life, in its 

 best form, the opaque disk with the open section, as 

 seen in Fig. 33, is revolved rapidly, while the transpar- 



