CH. XII] POSITION OF PROJECTION APPARATUS 



451 



616. Projection with inclined seats or gallery. If the seats 

 in the auditorium are raised after the manner of an amphitheater or 

 if a gallery is present, in many cases the apparatus can go to the 

 back of the room or in the gallery. This may make it necessary to 

 point the projection apparatus somewhat downward towards the 



FIG. 243. GROUND PLAN OF A LECTURE ROOM WITH THE MAGIC LANTERN 



ON THE LECTURER'S TABLE AND THE SCREEN AT THE SIDE OF THE ROOM. 



B Black-board. 



Ml Magic lantern on the lecture table (L T) and pointing up to the screen 

 (Sc) on the side of the room. 



Sc The screen is shown tipped forward to avoid distortion. 



Such a position of the lantern enables the lecturer to perform experiments or 

 show lantern slides conveniently. 



