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OPTIC PROJECTION
Foucault, Recueil des Travaux
Scientifiques 138
Fourtier 9, 202
et Moltini 621
Frame for darkening window
margins 445~447
for retouching slides 29, 203
French Congress of Photography 200
French lantern slides 200
Frequency, of alternating currents 486
apparatus adapted to 495
Fuess, R 56, 138, 150, 159
Fuse blocks, location of 520
Fuses 399.519
"blowing" of 519
burned out 47, 519-520
capacity 520
and circuit breakers 518-519
location and installation .... 519
on each line 519-520
on house circuit 83, 520
replacement of 520-52 1
wattmeter 519-520
Gas, amount in cylinders
103-104, 129
lamps 125
lighter 106
management 127
reflector 126
summary 136
Gases, proportion of in lime light 108
Gauges, pressure 102, 103, 129
Gelatin for lantern slides 205
General Electric Co 553
cuts loaned by 489-495
Generator 474
shunt 487
Gcntner (J. H. Gentner Co.) .... 459
German lantern slides 200
"Ghost" from reflections 245
Glass plates for polarizing light . . 624 tinted in combined projection 177
unvarnished 207
Glassine ink for writing on glass 207 Gloves, asbestos-patch . . . .21,22, 109
Glower of Nernst lamp 92-93
Golgi method 240
Goodwin, inventor of photographic film 682-683
Goring and Pritchard 283, 454
Gothic type for drawings 377
Gratings for spectra. . . .627, 632-635
s 'Gravesande . 140, 146
Ground of electric current
48, 497-498
Ground-glass to diffuse light 380
screen, transmission. 46 1-462, 465 Guide for making lantern slides . 207 Guides for apparatus blocks .... 292
Guil pastils 101
Gundlach-Manhattan Optical Co. 412
Hand-feed arc lamp 12, 15, 62
lamp for alternating current 68
lamp for small currents 286
Hartford Screw Co 296
Hassock and Rosenberg 9, 621
Heat, getting rid of, in rheostat 523
with small currents 350
Heating unequal on condenser . . 58
Heliostat 139
clock-driven 145
for east window 144
for south window 143
for west window 145
hand-regulated 140
how to set clock-shaft 147
kinds of 140
lens and prism 157, 159
mirror parallel to clock-shaft
154, 155
setting up 154
one-mirror 145, 146, 148, 150
setting up 149
positions of mirror 144, 156
principle of 151
southern hemisphere 156
setting up 158
two-mirror 145, 152, 153
arranging fixed mirror. . . 154 arranging movable mirror 152
Hepworth, C. M 391
Heyl, H. R 680
Hepworth, T. C 9
Historical Summary 673-687
Hitchcock, Prof. Romyn 265
Holland, translucent screens in . . 462
Home kinetoscope 435
Home-made optical bench . . . 288-296
projection apparatus 4, 287
rheostats 525~53°
Home projectors 435
Hood, on objective 245
showing light centered and
not 246
Hooke's joint and rod 82, 329