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SCIOPTICON MANUAL. 37 oil is thoroughly drained out of the lamp-cup should the instrument have to be repacked for transportation by public conveyance. Standing behind the instrument, placed about breast high—as upon its box on a stand or table—close down the reflector jBT, pass in the slides at o c? with the right hand, taking them out with the left as other slides take their places. Focus the picture by the milled head e, upon the screen, which may be distant sixteen feet, more or less, as it is desired to have the scenes on a larger or smaller scale. k (unlike the cut) is horizontal, and turns up to give the appearance of a falling curtain on the screen. THE SCREEN. There can be nothing better for the projected pictures than the white-finished, whitewashed, or white-papered walls of many a lecture-room or dwelling. An appro- priate space specially set apart and papered with white wall paper, having an outline, say of a wide recess or niche for statuary, is an inexpensive and not inelegant fixture, on which to display before the assembled house- hold, without waste of room or trouble in arranging, the richest treasures of all the art galleries in Christendom. The time is coming, when for purposes of demonstra- tion and illustration in the lecture-room, this whiteboard will rival the blackboard. The best material in the market for a movable screen of good size, seems to be bleached sheeting of close texture, but not very fine, twelve-quarters wide. This gives us the material, nine feet square, for about two dollars. It has the advantage of being available whether the instrument is placed before or behind it. As, however, every pencil of light falling between the