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INDEX
707
Arc lamp 12, 15, 61, 401, 536
alternating current 68, 72, 74
automatic 12, 61, 83, 328, 364, 512
ballast for 539, 544
choke coil for. ... 88, 352, 532, 544 direct current
candle-power 553-565
carbons for 87,551
current needed . . . .24, 248, 328
drawing with 328, 341
for spectra 628, 639
for micro-projection 236
for vision experiments.. 65 1-672 fine adjustments for. . .12, 72, 237
going out of 48
hand-feed 12, 62
house circuit 80
inductor for 88, 352, 544
installation of 500-505
intrinsic brilliancy of crater . . 564
lighting 21, 24, 88
"Lilliput" or baby form 81
managing 24, 414
material for installation 502
opaque projection with 182
polarity test 84, 506-511
position of carbons in
V 49, 50-51, 61, 70, 72, 550, 553
rheostat for
ii, 70, 83, 521, 539, 544
small 81, 82
small automatic 83, 364
small carbons for 341
small with clock-work 364
small with drawing 340
special dynamo for 486
starting 23
summary for small 97
testing polarity 506-512
threewire, automatic 238, 263, 512
three-wire, supply 514
turning off 88
with transformer 532-534
wiring 15, 69, 496-505, 513
wiring when far from main
.supply 513
wiring for large currents ... 513
Arrhenius 138
Asbestos-patch gloves 21, 74
Astigmatism, astigmia or unequal curvature 663-669
change with age 666
correct position of spectacles for .666
correction by cylindric lenses
665-666 correction by obliquity of
spectacles 665
correction by stenopaeic slit
669-670
demonstration of 663-668
discovery of by Young and
Airy 666
radial lines for 662-665
Atmospheric pressure 103
Attachment plugs . . . .86-87, 502-504
Auditorium for projection . . 395, 439
Automatic arc lamp, 12, 61, 83, 286,
328,334, 336,364, 512,639
Bausch and Lomb form 512
Ewon's 548
Leitz 364
Nernst 92
Reichert's 83
Thompson's 334
Axis of lenses 576-581
principal, and secondary . 576-579 Ayrton, Mrs 539
Balancing devices 521, 532
Ballast, alternating current
69-70, 521, 532, 544
direct current u, 521, 539
moving pictures 399
need with arc 539, 544
Nernst lamp 92
position of 512-513
small arc 83
Ball's Astronomy 139
Ball-pointed pen on unvarnished
glass 187, 207, 304, 306
Balopticon,
diagrams 188, 189
Edison Moving Picture attachment for 405
large for opaque objects 192
Nicholas Power, moving picture attachment 404
home 184
Balopticon, convertible. 187, 304, 306
Universal 191, 307
Barbara 675
Barrel, rheostat 526
Baseboard, for home-made apparatus 288-296
fixing track to 290