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INDEX
PAGE
Abbe diffraction theory 644-647
apparatus for 644
demonstrating to an audience and to an individual . . . 646-647
grating needed for 644
light for 646
Abbe substage condenser
273, 280, 626
Abbott, the Sun 139
Aberration, chromatic and
spherical 580-583
maximum and minimum. 582, 589
Absolute temperature 547
Absorption spectra 637-638
comparison spectrum with
637-638
glass box for use with 637
substances for 637-638
Accommodation in vision
651, 656-659
Kepler's theory of , . 657
lantern slide for experiments 656
necessity for 657
produced by muscular effort 659
Scheiner's theory 658
Acetylene, flame and lamp. .127-130 amount in prestolite tank. . . 129
position of lamp 128
summary 135
Achromatic and aplanatic combinations 581-583
substage condenser 272, 626
Adam's Essays 142
Adapters for small carbons in
large lamp 80
Advertising Magic Lanterns .... 435
a-k on microscope slide 361, 387
Alcohol, burner 130
ethyl, methyl and denatured
supply 130
Alcohol lamp 131
lighting 131
precautions, with 133
putting out 133
summary for use 137
Alco-radiant 130
Alternating current 475
advantages 475
PAGE
amperage 484
arc 542
arc, form of lamp 68
ballast with 544
carbons for 87, 552
cycle 486
disadvantages with arc lamp
68, 475
frequency 486
how produced 475
magic lantern with 68-77, 87
micro-projection with 284
power factor with 485
radiant efficiency of arc. .568-569 summary for use with the
magic lantern 76
units of 484
voltage 484
watts with 485
wiring 69, 512
Ambronn's Handbuch, Astrono
mische Instrumente 138
American, Institute of Electrical
Engineers 500
Journal of Science 157
lantern slides 200, 201
Microscopical Society 383
Ammeter 479, 510
alternating current 73
connections 480-482
direct current n, 481
does not register 52, 510
external shunt 479
in projection 236, 481
need in micro-projection .... 236
precautions for use 481
self-contained shunt 479
soft-cored 510
to measure current 479
testing polarity with 509, 510
Amperage 476, 484
alternating current 484
carrying capacity of copper
wires 500
cords and cables 501
for different forms of projection 500
found by Ohm's law 521-522