728 



OFTIC PROJECTION 



Spectra, absorption and substan- 

 ces for 637-638 



apparatus and material for, 626,643 



arc lamp for 639 



chemicals to use with 627, 637, 640 



comparison spectra 638 



current to use for emission 



spectra 639 



electrodes and stuffed elect- 

 rodes 627, 638 



emission spectra 638-640 



gratings for 627, 632-635 



illumination of the slit for. . . 636 



optical system for 628 



optical quartz system for. 62 7-641 



photography of 643 



prisms for 627, 631-632, 642 



quartz optical system. . . .627, 641 

 screens, white and anthracene 



for 627,635, 642 



slit for 626, 629-630 



substance to use for absorp- 

 tion spectra 637-638 



for emission spectra 640 



ultra-violet 641-642 



Spectrograph 642 



Spectrographic camera 643 



Specimen, stage for 239-240 



Spectacles for correcting eye de- 

 fects 659-672 



prism and colored for stereo- 

 scopic screen images 37~3^ 



Spectrum, showing visible radia- 

 tion 566 



Speed of shutter to prevent flick- 

 er .422-427 



of moving picture machine. . 420 



Spencer Lens Co., 28, 63, 8 1, 190. 193- 



196, 233,241,271,309-312,354, 



355 



Spherical and chromatic aberra- 

 tion 580-583 



Splicing moving picture film .... 428 



Spots on screen 309 



Spotting lantern slides 



19, 26, 29, 201, 203, 216 



Stage cooling device 239, 240 



Stage, mechanical 239, 241, 242 



in micro-projection 239-240 



water-cell 239, 240, 608 



Stain for tables 289 



Stampfer's magic disc 680 



Standard, aperture 571 



Standard, material for installing 



arc lamp 502 



Stanley, Geo. C 375 



Stanton, Thecd >re 673 



Starch polarity indicator 510 



Starrett (L. S. Starrett Co.) 295 



Stenopaeic slit 651-670 



Stereoscopic screen images. . . .37-38 



Stimson Hall 155 



C. H. Stoelting Co. .33, 141, 185, 302 



Storing lantern slides 218 



Straite, inventor of automatic arc 



lamp ooo 



Stray light, avoiding 380 



Striae, method of demonstrating 



647-650 



Style Brief, Wistar Institute. ... 374 

 Substage condenser 



232,271,347,619,626 



achromatic 282, 626 



aperture of 278 



centering 280 



and concave mirror 348 



Kohler method with 278, 619 



objectives with 281 



plane mirror with 348 



condenser, position 337 



position depending on slide. . 281 

 position with different ob- 

 jectives 282 



position with parallelizing lens 277 

 reduction of brillaincy by 



235, 618-620 



Summaries of the different chap- 

 ters: I, 64; II, 76; III, 97; 

 IV, 117; V, 135; VI, 164; 

 VII, 198; VIII, 220; IX, 313; 

 X, 388; XI, 438; XII, 472 

 Summary, alternating current. . 76 



direct current lanterns 64 



drawing and photography ... 388 



heliostats and sunlight 164 



house circuit 97 



lantern-slide making 220 



lime light 117 



micro-projection 313 



moving pictures 438 



oil, acetylene, alcohol 135 



opaque projection 198 



rooms and screens 472 



sunlight 164 



weak lights 135 



Sunlight for opaque projection. . 174 



