Bauhaus-Universität Weimar

Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Gage, Henry Simon and Henry Phelps Gage
§ 28. See if the lantern is centered.—Make sure that the 
different elements of the lantern are centered along one longitudinal 
axis (fig. 1,2). Then and then only will a perfect screen image be 
produced. If the apparatus was installed correctly in the begin¬ 
ning the only part liable to be out of line is the crater of the positive 
carbon. In burning the carbons frequently so wear away that the 
crater is at one side of the axis. Slight decentering of the crater 
can be easily corrected by using the fine adjustment designed for 
the purpose (§ io, fig. 3, see also Troubles § 79). 
§ 29. Slide-carrier.—Be sure that the slide-carrier works 
properly and easily. The “push-through’* form (fig. 6), is very 
convenient, for while one slide is on exhibition the one previously 
shown can be removed and another put in place, and it can be 
instantly put in front of the condenser when the lecturer signals. 
Fig. 6. "Push-Through” or Double Slide-Carrier. 
/ The frame which remains in one position in front of the condenser and 
serves as a container and guide for the "push-through” part. 
2 The movable slide-holder or “push-through” part of the carrier. It 
moves easily to the right and to the left. It contains two slides in the proper 
position for an erect image on a vertical opaque screen (see fig. 7, 8). 
3 j Notches in the movable part to enable one to grasp the slide easily. 
4 Elevator serving to lift the slide when at either end. In some forms the 
elevator lifts the entire slide from the middle instead of tilting one end. 
5 6 Inclined planes at each end. These raise the elevator when the carrier 
is moved to either end of the base. 
S i Lantern slide in the carrier in front of the condenser. 
S 2 Lantern slide in the carrier at the left end. It is of the first magic 
lantern (1665) and is in position to be removed or to be pushed to the right for 
§ 30. To start the arc light.—Turn on the current by closing 
the switch (fig. 1-4). If the lamp is of the automatic type the


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