INDEX 



725 



Projection apparatus, exhibition 270 



on house circuit 234, 285 



illumination for, 237, 247, 251, 

 271-282, 328, 335, 347, 598, 601 



limitations 223-224 



on market 296 



solar 142 



microscope 221, 234, 249, 271 



use 249 



defective vision demonstra- 

 tions 659-672 



moving pictures 



409, 420, 433, 593 



microscopic specimens 269 



multiple lanterns 34 



normal vision 652-659 



objective 18, 224, 464 



shield for 292 



objectives, micro-projection 



224-226, 244, 263 

 objective for moving pictures 



406, 412 



ocular 230-234, 280, 366, 600 



optics of 572 



position of carbons for 

 49-50, 249, 342, 415, 507, 537-550 

 room, form and darkness . 440-444 



specimens for 252, 268 



table 287 



with drawing shelf 325 



with vertical microscope. . . . 267 



with weak lights 120 



Projectors for home use 435 



Projectoscope combination. .185-186 



universal 302 



Proportion of gases for lime light 108 



Pseudoscopic effect 39 



"Push-through" slide carrier. ... 23 

 Pupil for eye experiments . . . 65 1 , 669 



effect of size in vision 669 



Ptolemy, phenomena of refrac- 

 tion 576 



Quartz optical system for ultra 



violet 641 



spectrograph for ultra violet 642 

 system for spectra of ultra 



violet 641 



Queen & Co 166 



Radial lines for showing eye 



defects 662-667 



Radiant or light source, 1 1, 68, 78, 90, 



92, IOO, 113, 119, 121, 125, 127, 



130, 138, 553 



Radiant, arrangement and cen- 

 tering 39-4 6 , 56 



distance from condenser. ... 41 



for drawing 328, 329 



Radiant efficiency 567 



and mirror. 189 



energy for moving pictures 

 with alternating current. . 570 



direct current 571 



for opaque projection 1 74 



position and illumination of 



condenser 42 



position of in opaque projec- 

 tion 174 



tilted 188-196 



Radiation, light energy of. . .566, 569 



visible and invisible 566 



Ramsden's Circle or disc 230 



type ocular 234 



Reactor 532 



Read, E. A 673 



Rectifier for alternating current 489 



Red lights near exits 443 



Reducing valve for gas cylinders 102 



Reflection 572 



irregular 572~573 



law of 140, 572 



losses by 175, 602 



metallic surfaced screens. . 458 



mirror 573 



regular 572 



semi-regular 573~574 



of various screens. .460, 463, 465 

 visibility of reflected beam. . 573 



Reflector, acetylene lamp 127 



gas lamp 126 



in opaque projection 175 



petroleum lamp 122 



Reflectoscope 180 



Refraction 575~576 



at plane surfaces 575 



at curved surfaces 575 



air to glass 575 



air to water 575 



density and refraction 576 



index of 576 



law of sines 576 



Ptolemy's laws of refraction 576 

 Snell and Descartes law of 



sines 576 



Refractive eye defects 659-672 



Regulations, fire underwriters, 



for wiring 499~5O5 



Reichert 82, 83, 93 



