INDEX 



727 



Screen, roller 456 



size 464 



size dependent on distance. . 466 



size for lantern slides 464 



size limited by room 469 



size for micro-projection. . . . 470 

 size for moving pictures. .395, 468 



size for petroleum lamp 125 



size for sunlight 162 



tipped to meet axial ray. . 449, 452 



translucent 461 



travelling 458 



troubles 471 



white washed wall -455 



Screws and nuts, thumb 296 



Search-light, use in opaque pro- 

 jection 187 



Sections, masked 253 



Separable, attachments . . 87, 503-504 



extension connector 87 



wall receptacles 86, 503 



Serial sections, masked 253 



Series, rheostats in 531 



Shadow projection with the lan- 

 tern 62 1 



Shadows, alternating current 



lantern 75 



avoidance of 190 



on screen 53 



Shedd , Dr. on history of Ohm's law 521 



Shellac for sizing 456 



Shield, asbestos paper for 266 



beyond objective 246 



for drawing in dark room .... 351 

 for drawing in light room .... 351 



objective 31, in, 292 



on condenser tube 349 



to hold objective 293 



Shock, electric, if on damp floor 59 



Short sight or myopia 660 



Short circuit 47, 496 



Shunt with ammeter 479 



generator 487-488 



adaptibility for arc lamp . 487-488 



connected to arc lamp 488 



Shutter, automatic fire 420 



Shutters for darkening room .... 446 

 on moving picture machine 



406-408, 410, 680 

 early use, by Heyl and Muy- 



bridge 680-682 



best position 422 



on moving picture machine 

 inside 407 



Shutters, number of wings 425 



outside 408, 410 



setting or "timing" 422 



speed to prevent flicker . .423-427 

 Size of carbons for house system 



87-88, 285, 341 



of condenser for drawings. . . 331 

 of drawing, how to obtain . . . 329 

 of screen 



125, 162, 395, 464, 468-470 

 Sizing, and amount for cloth 



screen 456 



Slide box 271 



cabinet 219 



carrier, individual 31,32 



lantern 23 



on moving picture machine. . 404 



push-through form 23 



masks and masking. 2 52-2 53, 387 

 thickness, and position of sub- 

 stage condenser 281, 337 



tray 270 



Slip-slides 36 



Slit for spectra 626, 629-630 



for Abbe diffraction experi- 

 ments 644 



home-made slit 630 



illumination of slit 636 



Smoke to show the path of light 



rays 247, 582 



Snap switch 515, 518 



Snell, mathematical law of re- 

 fraction 576 



Sockets for apparatus 292 



Socket, railing flange and 293 



separable attachments. . . .87, 504 



wall 86,503 



Sodium peroxide 113 



Sodium tungstate for fireproof- 

 ing cloth 321 



Source of light for projection 



n, 68, 78, 90, 92, 100, 113, 119, 

 I2i, 125, 127, 130, 138, 553 

 of light in demonstrations in 

 normal and defective vision 



652, 670 

 Specimen, effect of heat on. .252, 607 



for high powers 283 



for high power drawing 338 



for projection 224, 252 



Spectacle makers for supplying 



trial lenses 651 



Spectra 626-643 



