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INDEX
711
Dark ground illumination . . . 647-650
apparatus required 647
for demonstrating inhomogenieties in liquids or transparent solids 648-650
Foucault's method 650
method of striae 647
Toepler's "Schlieren-Methode"
647-650
Darkening room, method 446
Darkness, avoiding 112
in opaque projection 175
of room for sunlight 143
relative for different projection 443-446
Davids (Thaddeus Davids Co.) 207
Davy's Carbon Arc 686
Daylight vision 175
Decentering, effects of 53
Decoration of projection room
440-441
Defective vision 659-672
apparatus required for. . .651-655 condenser for demonstrations
652-653
demonstrations of 659-672
lantern slides for. . . .656-666, 671
source of light for 670
trial lenses for 651-655
Delineascopes
63, 193-196, 310, 312, 355 Descartes sine law for refraction 576
Deschanel's Physics 212
Diaphragm, effect on cone of
light 279
of substage condenser, effect with Koehler method, and with main condenser method of illumination 620
Diffraction, gratings 631, 644
images 632
pattern 644-645
Diopter, definition 229
in spectacle lenses 655
Direct current apparatus 9
arc, radiant efficiency compared with alternating
69, 474-475, 553-565
production of 474
summary for magic lantern . 64-67
units 475-478
use of 474
Dirt on lenses 55
Distortion, how to avoid in drawing 338
of image 338
Distribution of light, different forms of arc 562
Diverging light, to parallelize. . . 274
Dolbear, Art of projecting
122, 138, 174, 211, 621
Double-pole switch. . . 12, 70, 515-517
Drawing apparatus 319-389
attachment for ordinary magic lantern 327
booth 321
direct current arc lamp for ... 328
distance, varying for 335
fastening letter to 375
from lantern slides 326
high power 335
horizontal surface with magic
lantern 331
with opaque lantern 332
house lighting system for .... 339
landscapes 166
large objects with low powers 333
lettering the 374
microscope for 344, 385
microscope and lamp at right
angles 348
microscope in a dark room . . . 346 microscope without ocular or
substage condenser 334
models 357
objectives, 16-8 mm 335
oculars for 337
opaque lantern 332
outfit 350
house system 343
with inductor 352
(Koristka) 323
with microscope 343~354
with small currents 343
photographic camera for. . . . 332 projection apparatus for. ... 319 projection apparatus, early
forms 372
projection microscope for. . . 333
publication of 373
radiants other than the arc . . 329 range of objects with projection microscope 333
room and curtains 321
room, special 320
shelf 325
on projection table 326