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722
OPTIC PROJECTION
Oculist's trial lenses, 651, 655
where to be obtained 651
Ohm 477, 521
Ohmage 477
Ohmage by Ohm's law 521-522
Ohm's law 521
Oil lamp 121
Object, position on stage 257
for projection, objectives. . . . 268 projection when horizontal. . 268 size for opaque projection ... 179
visibility of 227
to draw with projection
microscope 333
erect image when vertical. . . 190
horizontal, image erect 190
how to light 335
illumination with main condenser 234
large, drawing with low
powers 333
for opaque projections 1 79
position with different objectives 256
Objective 18, 224, 226, 281, 609
aperture for opaque and
transparent objects 172
apparatus at rear of room . . . 464 apparatus not at rear of room
464, 468 brilliancy of the screen image 613
centering 247
demonstrations with high
powers 271
diaphragm of 380
distance from condenser 43, 247
drawing 335
focus and brightness of
screen 613
focus for room and screen . . 467
for different sized fields 254
formula for getting proper
focus 467
with hood for 245
immersion 225, 349
low power, mounting 241
magic lantern
18, 464, 597, 601, 609 microscope construction .... 616 microscope and image formation with 616
moving picture 406
painting black 246
Objective, photographic, construction 225
for photography 384
for photographic printing. . . 379 proportioned to condenser 43, 277
revolving nose-piece for 249
screen limited in size by 469
shield for 30-31, 246, 293
to use with substage condenser 281
various fields 255
various objects 268-269
Old age sight or presbyopia 66 1
Opaque lantern for drawing. . . . 332 drawing on horizontal surface 332
one source 173
two sources 173
with sunlight 174
Opaque objects, bright images of 174
lighting entire 187
magnification and size of
image 181
projection, 166, 168, 183, 184, 187, 188, 191, 192, 196
screen and distance 181
size and kind of objects 179
summary 198
troubles 195
versus transparency. 1 68, 169, 170 Operating room, for moving pictures 396-398, 453
construction (M. P. World) . . 397
permanent 396
temporary 396
Operation of moving picture
machine 420
Operator, competent 390
Optical bench 288-289, 294
deceptions 36
system for spectra 628, 641
Optics of moving pictures. . .409, 591
of projection, general 572
Orange G for staining masks .... 253 Oscillogram, anode currents. . . . 495 current supplied and delivered 493
potential and electromotive
force 494
rectifier 493~495
Oxodium 113
Oxone 113
Oxygen, cylinder 101