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INDEX
717
Lantern, square 29
"spotting" or marking
19, 201, 216
standard 202
standard American 25, 200
storing 218
summary 220
troubles in making 219
typewritten 215
unvarnished, ink and pen for 207
varnishing 205
Lantern slide carrier for delinea
scope 28, 63, 196
carrier for experiments in
vision 651-654
permanent 31-32
push-through form 23
ways of making 203
writing them with a pen . . 204-208 Lathe bed type of projection apparatus 262, 289
Latitude and heliostat 160
Lavasseur, Professor E 673, 685
Law of magnification and reduction 357,369
Law of reflection 140, 572-574
Law of refraction 576
Lecturer, suggestions to on magic
lantern exhibition 19
Lecture rooms 439-454
Lecture room with gallery 448
with raised seats 449-451
screen at side 450-45 1
transluctent screen 453
Lehmann, fluid crystals, etc. ... 621
Leiss, C 138
Leitz, Ernst, 79, 178, 225, 299, 360,
362, 363, 364, Lens, aberration, chromatic. . . . 583
spherical ; . . . 580-586
how corrected 581
achromatic 583
aplanatic 581
axis of, principal and secondary 576-579
center of curvature 577
center, optic 576-577
concave, convex and meniscus 577
concave to make light cone
parallel 273,276
convex to make light cone parallel 274-276
Lens, crystalline of the eye 657
change of shape in accommodation 658
definition of 576
dioptry of 229-230
equivalent focus of 580
focus of, principal and conjugate 578-582
focus, equivalent 580
holder for trial lenses. .651-654
meniscus 577
optic center of 576-577
principal focus of 578
principal focus, how found
579-58o principal and secondary axes
576-579
radius of curvature of 577
secondary and principal axes
of 576-58o
support for trial lenses. . .651-654 unit of strength (diopter) .... 229 Lenses, cylindrical for eye defects 664 detecting strain in by polarzed light 626
for experiments in vision. 65 1-672
forms of 577
position in the triple and in the double lens condenser
10, 13, 591-592
Oculists' trial 651
Leonardo da Vinci 674
Lettering, drawings 374
fastening the letters 375
size for drawings 376
Letters, a-k on specimen. . . .361, 387
on tissue paper 375
white on black ground 375
Levi Ben Gersen 674
Light from alternating current
arc 565
absorption by lenses and object v 601-602, 620
amount from sun 138
amount with petroleum lamp 125 for demonstrations in vision
652, 670
from arc, cause of 546
from arc direct and alternating current 554
of arc dependent on temperature 547
avoiding stray 380
in center of condenser face ... 44