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 cur- 

 rents 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 photo- 

 graphic 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 5 2 5~53 



Home projectors 435 



Hood, on objective 245 



showing light centered and 



not 246 



Hooke's joint and rod 82, 329 



