via OPTIC PROJECTION 



504; Stray light, 505-506; Magnification of drawings, 507-508; 

 509-510; Drawings for models, 511; Erect images in the drawings, 

 512-516; 517-526; Drawings for publication with projection appara- 

 tus, 527-530; Drawings and their lettering, 531; Photography with 

 projection apparatus, 532-547; Troubles met in Ch. X, 548; Sum 

 mary of Ch. X, 549. 



CHAPTER XI 

 Moving Pictures 



Fig. 221-236; 550-599 .. .pp. 390-438 



Apparatus and material, 550; Introduction, 552; Auditorium, screen 

 and operating room, 553-557; Current, lamps and moving picture 

 machine, 558-574; Installation of a moving picture outfit, 575; 

 Optics of moving picture projection, 576-578; Magic lantern with the 

 moving picture machine, 579; Management of the lamp, moving pic- 

 ture machine mechanism, 580-589; flicker, 590-592; General precau- 

 tions, 593; Splicing films, 594; Winding and rewinding, 595; 

 Danger of fire, 596; Conduct of an exhibition, 597; Home projectors 

 and advertising magic lanterns, 598; Troubles with moving pictures, 

 599; Summary of Ch. XI, 599 1 . 



CHAPTER XII 

 Projection Rooms and Screens 



Fig. 237-251 ; 600-642 pp. 439-473 



Apparatus and material for Ch. XII, 600; Suitable room for projection, and 

 its lighting, 602-611; Position of the projection apparatus in the room, 

 612-620; Screen for the image, 621-628; 629-632; Size of screens and 

 screen images, 633-640; Troubles with rooms and screens, 641; 

 Summary of Ch. XII, 642. 



CHAPTER XIII 



Electric Currents and their Measurement; Arc Lamps, Wiring and Control; 

 Candle-Power of Arc Lamps for Projection 



Fig. 252-308; 650-782 pp. 474-571 



Apparatus and material for Ch. XIII, 650; Electric currents, kinds and 

 comparison, 652-653; Electric units, 654-661; Electric measure- 

 ments and apparatus, 662-671 ; 672-674; Power factor, cycle, frequency, 

 675-677; Special dynamo for arc lamps, 678-680; Current rectifiers, 

 681-683; 135 and 25 cycle currents for projection, 684-685; Wiring 

 for arc lamp from dynamo back to dynamo, 686; Amperages for 

 different purposes, short circuit, ground, insulation of wires, 687-690; 



