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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 projection 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 lantern 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 substage condenser 281, 337
tray 270
Slip-slides 36
Slit for spectra 626, 629-630
for Abbe diffraction experiments 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 refraction 576
Sockets for apparatus 292
Socket, railing flange and 293
separable attachments. . . .87, 504
wall 86,503
Sodium peroxide 113
Sodium tungstate for fireproofing 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