INDEX
715
Hop wood, H. V............... 391
Horizontal objects..........32, 268
Homer’s Zoetrope.........68o, 682
House system for projection
microscope................ 285
fusing ................... 83
lamp for.................. 78
Huhbell (Hubbell Inc.)
86-87, 503-505
Huygenian ocular......230, 233, 280
Hydrogen, cylinders........... 103
substitute for.............. 113
Hyperopia or long sight........ 661
Iban A1 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 aber¬
ration ................. 585
condenser without spherical
aberration.............. 584
connection with aperture.... 615
correct..........26-27, .371 > 3®7
dim and brilliant in combined
projection.............. 177
erect 26-27, »9°. 359. 363-365-
367. 369. 37». 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.....591 -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, 359-37». 5®4
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............ »3
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
5»3-5»4
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..............»38-»39
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 ap¬
paratus................. 686