INDEX 



715 



Hopwood, H. V 391 



Horizontal objects 32, 268 



Homer's Zoetrope 680, 682 



House system for projection 



microscope 285 



fusing 83 



lamp for 78 



Hubbell (Hubbell Inc.) 



86-87, 503-505 



Huygenian ocular 230, 233, 280 



Hydrogen, cylinders 103 



substitute for 1 13 



Hyperopia or long sight 66 1 



Iban Al Haitem and the camera 



obscura 674 



Illumination, dark ground. . .647-650 

 Foucault's method of . . . .650-651 



Toepler's method of 650-651 



Illumination, flashes per second 



at which flicker disappears 424 



with high powers 599-601 



with lower powers 598 



with magic lanterns 16-18,584-587 

 with moving pictures 



411-415, 593-598 



with projection microscope 



247-256, 271, 278, 284, 286, 287, 



328, 335, 346, 598-601, 617-620 



Illuminating gas for lime light ... 112 



for magic lantern 125-127 



Image, brightness of . . 18-19, 612-617 



carbons 251 



.condenser with spherical aber- 

 ration 585 



condenser without spherical 



aberration 584 



connection with aperture .... 615 



correct 26-27, 371, 387 



dim and brilliant in combined 



projection 177 



erect 26-27, r 9O, 359. 363-365- 

 367/369,371,373,387 

 with opaque lantern . . 363-365 

 with translucent screen 



26, 362 



with two lenses 368-369 



formation with, the magic 



lantern 584 



effect of an extended source 



of light 586 



moving pictures 59i~598 



point not on the axis 617 



projection microscope. . .598-601 



Image projection microscope with 



amplifier or ocular. . . .600-601 



a microscope objective 616 



hazy 308 



inverted 26-28, 359-371, 584 



for micro-projection 470 



for different microscope tubes 243 



for moving pictures 468 



for opaque projection 181 



for screen distances 466 



lantern slides for 464 



sharpness of 28-30, 256 



size, found by calculation. . . 261 

 found by measurement 



257-260 

 stereoscopic with the magic 



lantern 37~39 



troubles with screen images 



52-57,301,308 



Incandescent lamp 14 



after rheostat 17 



before rheostat 13 



testing for voltage 46 



tracing pictures 374 



Inclined carbons 61, 70, 543-550 



Indirect room lighting 441-443 



Inductor 352-532 



with arc lamp 352, 532 



varying amperage with 532 



wiring. 352, 532 



Infra-red radiation 566 



Ink for unvarnished slides 207 



Inks and pens for varnished slides 



206-207 

 Insulation with large currents 



5I3-5H 



for long distance wiring 513 



of wires 497-498 



regulating amperage 501 



Intensity of light, in different 



directions 563 



Intrinsic brilliancy, of crater of 



arc 564 



of the light source 



138, 564, 612-615 



of the sun 138-139 



Iodized starch polarity indicator 510 

 Iris diaphragm, effect on cone of 



light 279, 620 



Italian lantern slides 201 



Ives, Fred E. Ether oxygen lime 

 light, history and new ap- 

 paratus 686 



