INDEX 



709 



inclined 61, 70 



incorrect position 51 



not near enough 47, 48 



observing with moving pic- 

 tures 403, 414-415 



polarity right and wrong. 506-5 12 

 position, 72, 284, 507, 538, 540- 



548, 

 preparation for exhibition 250, 433 



distribution of light 565 



size 87, 415, 551-552 



size for moving pictures 415 



current, candle-power. . . 248 



house circuit 341 



small with alternating current 342 



small arc lamp 79, 87 



small with direct current. . . . 342 



solid and cored 250 



terminals 12, 539 



too short 47 



why small on house circuit ... 341 



Cardboard screen 80, 458 



Cardanus 674 



Carrying capacity of electric 



cords, how calculated 501 



and insulation 500 



flexible cables 501 



of copper wire 500 



Caution for lime light 107 



Celluloid, films 431 



inflammability of 431 



Center of lenses 576, 577 



of lens face, how to find .... 40, 41 



Centering 23, 39 



alternating current lantern . . 73 

 apparatus for vision experi- 

 ments 653, 671 



heliostat 150 



mazda lamp 91 



mechanical 40 



micro-projection. . . .246, 251, 285 

 moving picture machine. 4 10-4 12 



Nernst lamp 93 



objective 247 



objective hood 246 



objective, vertical 45 



optical test, condenser and 



objective 44 



perpendicular to axis 41 



radiant and condenser 41 



substage condenser 280 



troubles if incorrect 53 



Centimeter rule 27, 318, 371 



Cerium iron gas lighter 106 



Chadburn 173, 180, 183, 190 



Chadwick, Hepworth and Wright 173 



Chamot, Dr. E. M 207 



Chemical polarity indicators. ... 510 



Chevalier 322 



Choke-coils 88, 352, 532, 544 



Chromatic and spherical aberra- 

 tion 580,583 



Circuit, electric 496 



breakers 518 



open and closed by switches 



514-518 



with break 514 



with one ground 497 



with two grounds 498 



Clock-shaft of heliostat, parallel 



with earth's axis 147, 160 



Cloth screens 457 



Cohn, eye defects in school child- 

 ren 659 



Color, used in moving pictures . . 392 



Colored moving pictures 392 



Coloring lantern slides 217 



Combined apparatus 356 



Combined projection, 175, 176, 180, 

 182, 184, 186, 189, 193, 194, 295, 

 297, 300 

 avoiding contrast of images . . 177 



two complete outfits 297 



Comparison spectrum 637-638 



Compensation ocular 232 



Concave lens for parallelizing 



light 337 



Condenser 14, 587 



Abbe substage 273, 626 



aperture of, to increase, or 



diminish 616-617 



achromatic substage 272, 626 



aperture of substage 278 



centering substage 280 



diaphragm opening 337 



distance from objective, in 



microprojection 247 



distance from radiant 41 



end to be next the radiant 



58, 62, 66 



ends reversed 58, 62, 66 



first element of 65, 588 



focus of second element for 



the objective 65, 590-591 



focus too long 55 



focus too short 55 



for demonstrations in vision 



652-653 



