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INDEX
715
Hopwood, H. V 391
Horizontal objects 32, 268
Homer's Zoetrope 680, 682
House system for projection
microscope 285
fusing 83
lamp for 78
Hubbell (Hubbell Inc.)
86-87, 503-505
Huygenian ocular 230, 233, 280
Hydrogen, cylinders 103
substitute for 1 13
Hyperopia or long sight 66 1
Iban Al Haitem and the camera
obscura 674
Illumination, dark ground. . .647-650 Foucault's method of . . . .650-651
Toepler's method of 650-651
Illumination, flashes per second
at which flicker disappears 424
with high powers 599-601
with lower powers 598
with magic lanterns 16-18,584-587 with moving pictures
411-415, 593-598
with projection microscope
247-256, 271, 278, 284, 286, 287,
328, 335, 346, 598-601, 617-620
Illuminating gas for lime light ... 112
for magic lantern 125-127
Image, brightness of . . 18-19, 612-617
carbons 251
.condenser with spherical aberration 585
condenser without spherical
aberration 584
connection with aperture .... 615
correct 26-27, 371, 387
dim and brilliant in combined
projection 177
erect 26-27, r9O, 359. 363-365367/369,371,373,387 with opaque lantern . . 363-365 with translucent screen
26, 362
with two lenses 368-369
formation with, the magic
lantern 584
effect of an extended source
of light 586
moving pictures 59i~598
point not on the axis 617
projection microscope. . .598-601
Image projection microscope with
amplifier or ocular. . . .600-601
a microscope objective 616
hazy 308
inverted 26-28, 359-371, 584
for micro-projection 470
for different microscope tubes 243
for moving pictures 468
for opaque projection 181
for screen distances 466
lantern slides for 464
sharpness of 28-30, 256
size, found by calculation. . . 261 found by measurement
257-260 stereoscopic with the magic
lantern 37~39
troubles with screen images
52-57,301,308
Incandescent lamp 14
after rheostat 17
before rheostat 13
testing for voltage 46
tracing pictures 374
Inclined carbons 61, 70, 543-550
Indirect room lighting 441-443
Inductor 352-532
with arc lamp 352, 532
varying amperage with 532
wiring. 352, 532
Infra-red radiation 566
Ink for unvarnished slides 207
Inks and pens for varnished slides
206-207 Insulation with large currents
5I3-5H
for long distance wiring 513
of wires 497-498
regulating amperage 501
Intensity of light, in different
directions 563
Intrinsic brilliancy, of crater of
arc 564
of the light source
138, 564, 612-615
of the sun 138-139
Iodized starch polarity indicator 510 Iris diaphragm, effect on cone of
light 279, 620
Italian lantern slides 201
Ives, Fred E. — Ether oxygen lime light, history and new apparatus 686