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726
OPTIC PROJECTION
Reinhold, use of camera obscura
in eclipses 674
Requirements for good projection
7, 1 8, 222-223, 313-317, 433 for projection with weak
lights 120
Resistance, to control current . . . 539 how to get amount needed ... 52 1
unit of 477
Retouching frame 29, 203
Rewinding moving picture film . . 430
Reynolds' 374
Rheostat 521-531
adjustable 263, 326, 523-524
alternating current 69, 532
barrel, saltwater 525-526
calibration of 525
direct current 1 1 , 52 1
energy used 533
fixed 523
heat developed in 523
home-made 526-530
installing 84, 339, 504, 524
in parallel 531
on 1 10 volt line 542
range of 263, 326, 523-524
salt water 525-526
series 531
tin strips 529~53O
water cooled 527-528
wiring 504, 524
Richardson's Motion Picture Handbook
390-391,397,420,439
Riley, Dr 327, 331
Ripolin white paint 264
Roaring of alcohol lamp 134
Roaring of lime light 115
Rods for optical bench 290
Roller screens 456
Rooms, for projection 439
Room, apparatus on lecture table
451-452
darkening 443
darkness for opaque projection 175
for drawing and photography 32 1
for micro-projection 235
for moving pictures 395
form for projection 440
light in projection 441, 443
limiting size of screen 469
Room, size with sunlight 162
tint and decoration 440
troubles with 471
Salt and water polarity indicator 511 water rheostat 525-526
Scale, diagrams with opaque lantern 356
wall diagrams 355
Scheiner 361, 679
demonstration of retinal
image 656
theory of accommodation 658
Oculus 368
Science 2 1 1 , 327
Scientific American 221
Schmidt & Haensch 102, 126
Screens 454-466
anthracene 627, 635-642
Screen, in alcove 443
cloth 457
dark spots on 309
distance 464-471
distance, for high powers. . . . 282 distance, micro-projection
225,282 for opaque projection. . . 181, 454
for high powers 272, 282
hinged to meet axial ray 449
image, actual size 257
with amplifiers and oculars 258 perfection and brilliancy
18,612-617 image, not photographically
sharp 256
with polarized light 626
size of 464
spectra 627, 635, 642
stereoscopic 37
with vision experiments 654
not light enough 301
with metallic surface .... 458-463
micro-projection 235, 454
moving pictures 395, 454
painted cloth 455
painted on wall 454
paper 458
plaster of Paris 454
qualities of goods 454
reflection 460-465
reflection, semi-diffuse 459
reflection, white. .246, 460, 462