34 SCIOPTICON MANUAL. 



in the evening ; shutting out daylight is not only trou- 

 blesome, but the eye is not prepared for the contrast. 

 Lights should bo turned down near the screen, but may 

 be left dimly burning in the distance, or out of range 

 of the screen. 



Light the lamp in the instrument, as it stands in the 

 diagram, by removing the back glass, (?', turning up the 

 wicks by a turn inward of the buttons w 10, and reach- 

 ing the wicks V V through E with a lighted match. 

 To avoid smoke, turn the wicks almost down again till 

 the glass is replaced. 



Turn up the flames evenly about half an inch at first; 

 they will rise a little after the wicks are warm, when 

 they may need looking to again, after which they will 

 stand steady without requiring further attention. 



Put out the light by drawing the wicks down with a 

 turn of the buttons outward, and then blowing under 

 the reflector. 



The wicks may be trimmed when the lamp is taken 

 out to bo filled; cut them level; it may bo done more 

 evenly by only removing the black part. 



If kept in a dry place the reflector will keep its polish 

 for a long time; it is protected by a film which should 

 not be rubbed. 



While exhibiting, the operator should stand behind 

 the instrument, having the slides arranged at his right, 

 in the proper order and inverted position required for 

 exhibition. If the instrument is in front of the screen, 

 the wire ring fastening the double glass into the wooden 

 mounts should be towards the condenser, in order to 

 show the views in a right-handed position. Some oper- 

 ators mark what should be the upper right hand corner 

 of each picture, with a piece of white paper, or a notch. 



Pass the slides in with the right hand, level and true, 



