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724
OPTIC PROJECTION
Porte lumere, setting up 142
for south window 143
for west window 145
Porter, T. C 424-426
Position of Ballast 512-513
condenser and objective. . .43, 251 of filament (mazda lamp) ... 91 of moving picture machine . . 396
of object on stage 257
of object with various objectives 256
of switch 515-518
Post-card projector 183
Potato polarity indicator 511
Potential drop and arc length 536-539
and current 536
and electrodes 536
Potential, oscillogram, electromotive force supplied 494
Potter, A. O 177
Power at arc, wattmeter connections 482
Power, Nicholas Company
391,402,404,410,417 Power consumption, candlepower 559, 561
factor 485
Precautions, alcohol lamp 133
ammeter, wiring 481-482
heavy currents 186, 513
lime light 116
in polarity tests 506
for wiring 498, 513
Precision Machine Co 406
Presbyopia, old age sight. . . .661-662
Pressure gauges 102, 103
gauge, acetylene tank 128
of one atmosphere 103
reducing valve 102
Prestolite tanks 127, 128, 129
Principal axis 577~58i
focus and how obtained . . 578-579
Print, size for lantern slides 208
Printing, artificial light 214
on paper or a dry plate,
directly 381
exposure for 380
how to hold paper 379
lantern slides 209
lantern slides with camera. . . 213
paper to use 379
Prints, enlarged from negatives. 378
white on black 213
Prism, 37, 46, 190, 196, 322, 337, 344, 368, 629-632, 640-643
erecting 368
direct vision 627, 631
drawing 322, 337, 344
glass 627, 629-630
hollow for liquids. . .627, 631-632
polarizing 622-626
quartz for ultra-violet 641
right-angled with vertical
objective 46
Rutherford's 630-631
spectacles of 37
Prism, Nicol for polarizing or
analyzing light. . .622, 624, 626 Proceedings of the American Association for the Advancement of Science ..211,321 Proceedings of the International
Electrical Congress 566
of the American Microscopical Society 320
of the Royal Society 426
Projection apparatus, with mirror on lecture table. . . .451-452
outside the room 453
for photographic enlargements 378
rules for construction 6
aid to drawing 319
apparatus, best position in
room 446
early use with drawing. . . . 372
form for drawing 321
home-made 287
similarity of all 221
from three standpoints 3
universal 178, 185, 191
of human face 1 70
horizontal objects
33, 185, 190, 268 illumination in high power. . . 271
in physics 621-651
material and apparatus for
622, 626-627, 643, 644, 651
of spectra 626-642
special experiments in 622
with polarized light 622-626
with ultra-violet light
627, 641-642
microscope, 178, 221, 222, 271, 282, 299, 300, 303, 309, 322, 598 60 1 microscope with amplifier
238, 366, 599-600
drawing with 333
erect images with 367-373