The Art of projection and complete magic lantern ... - Yesterday Image

T30For small discs the " Focus incandescent lamp " fig. 63, shown actualsize, is very useful, as a disc of 8 to 12 feet can be obtained with the 100candle power pattern. The great advantage of this for home use andFig. 63.experimental work, is that once' in position and adjusted for the'centre ofoptical system of lantern, it is only a question of making the connectionwith the electric supply, or switching on the current, to get the apparatusready for use, and project pictures, &c., on the screen.THE APHENGESCOPE OR OPAQUE LANTERN.An instrument for exhibiting opaque objects and photographs, the sizephotograph that it will take up or cover depends entirely upon the lens,