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708
OPTIC PROJECTION
Bausch & Lomb Optical Company, cuts loaned by, 35, 60, 90, 91, 127, 184, 187-189, 191-192, 304, 306-308, 356, 358, 404-405 ref. in text, 80, 190, 286, 459, 512
Bayley 9, 217
Bench, home-made optical 288
Beseler, (Chas. Beseler Co.) .... 94
Blackboard, lighting 448-452
Black stain for tables 289
Blackened, apparatus. . . .7, 242-246
objectives 246
Block with lead sheets 292
Blocks for apparatus 291
Blondel, intrinsic brilliancy determination 564-566
Blood corpuscles, demonstration
of 227
"Blow" said of a fuse 83
Blow-through jet 105
Botanical Gazette 289
Botanische Zeitschrift 289
Boyle's law and camera. . 104, 129,675
Box to cover switch 517
Break in circuit 514
Briggs* lantern slides 673
Brilliancy, of screen image 610
intrinsic. . .564-566, 613-615, 619 limit of, with projection microscope 618
reduction by substage condenser, amplifier and ocular 61 8
sunlight most brilliant 619
British lantern slide 200, 203
British photographic society .... 217 Brown & Sharp's wire gauge .... 502 Bulletin of the Bureau of Standards 547, 566
Bunsen burner 125
Burner, blow-through type 105
lime light 105
mixed jet 107
roars or hisses 115
Burning out a fuse 519
Burning point or focus 578
Burr, Geo. L 673
Bushings for small carbons in large lamp 80
Camera, adjustable back 212
and plate-holder 382
enlarging, reducing, copying 210 hinged baseboard 211
landscape drawing 166, 167
lantern slide making 209, 213
printing by projection 378
spectrographic 643
tilting 212
vertical 382
Camera obscura, history . . . 673-575
Candle-power, and current 559
current and size carbons
87, 248, 551-552 direct current inclined carbons 556
formula for finding 613
of arc lamps 553-565
from kilowats 558
lime light, relative 100
petroleum lamp 125
power consumption 561-562
rectifier 558-559
rectifier
inclined carbons 557
right-angled carbons. . . . 558
sun 138
variation with current . . . 553-556 watts, alternating current,
inclined carbons 557
right-angled carbons 557
right-angled carbons 556
Capacity of gas cylinders 104, 128-129
Capacity meter 103
Carbon arc lamp for spectra. ... 628
Carbons, adjusting 252
alternating and direct current with 340
arc with 10 and 20 amperes . . 249 arrangement of 543, 545, 548, inclined; right-angled, 342, 507, 538, 540-542
arrangement in micro-projection 284
bad position 50
composition and movement. 72 converging, with alternating
current 564-565
cored and solid 250
correct position 49
efficiency of different arrangements .560-561
electrodes 539
feeding with alternating current 74
feeding on house circuit 342
feeding with small arc 87
house system 341
image on screen 251