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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,