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730
OPTIC PROJECTION
Ultra-violet, quartz optical system for 641-642
radiation 567, 641-642
projection of 640 642
United States Geological Survey 147 Units of alternating current . 484-486
Units of direct current 475-483
Units of electricity 475, 484
University of Pennsylvania and
animal movement 682
Unpacking moving picture machine 401
Uranium arc for spectra 628
when in the positive, and when in the negative electrode 640
Valspar varnish for water cells
205, 264
Varnishing lantern slides 205
Vertical microscope for high
powers 283
Vertical knife switch 516
Vertical projection 33
Violet lines in arc stream 546
Visibility of objects 227
Vision, daylight and twilight
121, 175, 444 Vision, experiments with normal
651-659
defective 659-672
persistence of in moving pictures
Visual angle 228
Voigtlander und Sohn 226, 250
Volt and voltage 476, 484
Voltage, alternating current .... 484
by Ohm's law 521
intermediate 544
of line and arc 544
of line, voltmeter connections 475
not present in the line 46
Voltmeter, connection for arc
voltage . .„ 476
connection to circuit 478
direct current 478
for line voltage 475
for polarity testing 508
soft cored 510
Walgensten 3, 675-677
Wall diagrams 329, 355
Wall receptacle 86, 503
Water-cell, 13, 15, 18, 57, 63, 71, 161, 194, 222-223, 237, 239-240, 264-266, 276-277, 281-282, 287, 299, 301, 309, 355, 365, 421, 432, 571, 592, 604-609 absorption of radiant heat not affected by temperature . . . 606
effect of alum, etc. in 607
efficiency 568-569
light and energy absorbed by
604-607
in micro-projection 237
the microscope stage in 608
how to make 264
need in moving pictures . . 42 1 . 432 with ordinary microscope. . . 266 position in micro-projection 239, 240
shadow from 57
stage 239-240
sunlight 161
sun and micro-projection. . . . 287 with two-lens condenser . . 365, 42 1
Water cooled rheostat 527
Waterhouse, Gen. J 673
Watt, and wattmeter. 477, 482-483
Watts, alternating current 485
equal volts times amperes
477,521
Wattmeter 482-483
amperage by 483
connecting 482
power at arc by 482
power from dynamo 483
White, Dr. A. C 673
White-washed wall screen 455
Wiedemann's Annalen 647
Williams, Brown & Earle
59, 91, 107, 130, 131, 182, 183, 300
Wimmer 9, 202
Winding and rewinding moving
picture film 430
Widow in lamp -house
72, 267, 402-403 Window shades for darkening
the room 445-447
Wires for the electric circuit . 496-505
how to connect 503
insulation of 497-498
wrong polarity 51, 506-5 1 1
Wiring the arc lamp, 10, 13, 15, 71, 84, 263, 324, 339-340. 399, 496535, 639