CONTENTS ix 



Regulations for wiring, 691-692; 693-700; Polarity tests for direct 

 current, 701-703; Wiring the three-wire automatic lamp, 704; Wiring 

 for alternating current, 705-710; Switches, circuit breakers and fuses 

 711-722; Resistors or rheostats, 723-735; Reactors, inductors, 

 choke-coils, etc., 736-738; Transformer, 739; The electric arc, 740- 

 743; The use of ballast (rheostats, etc.), 744 748; The arc lamp, light 

 and heat from, 749-752 ; Carbons and their position, 753 ; Table show- 

 ing size and wear of carbons, 753a; Candle power of arc lamps, 754- 

 762; Candle power, and energy required, 763-768; Distribution of light 

 intensity in different directions, 769-771; Intrinsic brilliancy of the 

 crater, 773; Visible and invisible radiation, 774; Radiant efficiency 

 of arc lamps, 775-776; Energy required for moving picture projection, 

 779-78i ; Effect of opacity in the film, 782. 



CHAPTER XIV 

 Optics of Projection 



Fig- 309-349; 790-865 pp. 572-620 



Reflection and refraction, 792-801; Lenses, 802-808; Spherical and 

 chromatic aberration in lenses, 809-810; Image formation with the 

 magic lantern, 811-817; Focus of Condenser and objective, 818; 

 Types of condensers, 819-821; Image formation with moving pictures, 

 822-832; Image formation with the projection microscope, 833-838; 

 Light losses, 839-843; Energy losses, 844-854; Effect of aperture, 

 855-856; Brightness of the screen image, 857; Microscopic image 

 and aperture, 858-863; Koehler method of illumination, 864-865. 



CHAPTER XV 

 Uses of Projection in Physics; Normal and Defective Vision 



Fig. 350-402; 875-932 pp. 621-672 



Apparatus and material for Ch. XV, 875; Introduction, 877-878; Experi- 

 ments with polarized light, 879-884; Projection of spectra, 885-900; 

 Absorption spectra, 901-902; Emission spectra, 903-905; Ultra- 

 violet light, photography, 906-908; Abbe diffraction theory, 909-911; 

 Dark ground illumination, striae, 912-915; Normal vision and eye 

 defects, 916-932. 



Appendix. Brief Historical Statement on the Origin and Develop- 

 ment of Projection Apparatus 673 



Projection Apparatus and Accessories in the Open Market; Manu- 

 facturers 688 



Bibliography on Projectior 693 



Index of names and subjects 705 



