13 



To Operate the New Cut-off, 



Each framed slide is taken upside down, with the right- 

 hand thumb nail at the mark, half an inch from the wire 

 ring, and rested in readiness on the end of the stage, while 

 the left hand is placed in readiness to close the latch with 

 the fingers and to receive the outcoming slide, pressing it 

 forward against the lever which opens the latch the instant 

 the right-hand thumb reaches the condenser ring. The 

 change may be effected instantaneously, but to prevent see- 

 ing any glimpse of movement on the screen it is better to 

 time the starting of, first the left hand, then the right, by 

 counting one, two. This order soon becomes habitual, when 

 the counting may be discontinued. 



Glass slides follow each other in the same way through 

 the carrier, only each outcoming slide opens the latch at 

 the first notch in the spring. 



The operation is not quite automatic, like the original 

 cut-off, but the effect is quite as satisfactory. It allows the 

 operator to be governed by circumstances, it is not liable to 

 get out of gear, and it is applicable to both oil and gas 

 Sciopticons, and to all sorts of slides. 



The Sciopticon Lamp and Flame Chamber 



Can now be made interchangeable with the triple jet in the 

 Gas Sciopticon, with cut-off arranged for all sorts of slides, 

 all for $65.00. Only the clamp has to be omitted to allow 

 the base of the oil cup to run in the side grooves, the same 

 as in the Oil Sciopticon. 



This arrangement is better than introducing the triple 

 jet into the Oil Sciopticon, as described in the Manual, p. 

 160 ; but it is not better, except in the matter of bulk^than 

 using an extra body. See Catalogue, p. 2, No. 13. 



This Lamp arrangement is not sold without a lantern. 



