716 



OPTIC PROJECTION 



Janssen astronomer, pictures of 

 the transit of Venus with a 

 photographic revolver in- 

 vented by him in 1873 (see 

 Marey, Hist. Chronopho- 



tography) 683 



Jablochoff, arc lamp with paral- 

 lel carbons (see Silvanus P. 



Thompson) 686 



Jenkins, C. F 391, 686 



Journal of Applied Microscopy. 289 

 Journal Royal Microscopical So- 

 ciety 221 



Journal Royal Society of Arts 200, 686 



Keller (P. Keller & Co.) 61 



Kepler. . .321, 361, 368, 656-657, 678 

 accommodation for distance 657 

 hypothesis of accommodation 657 

 inverted retinal image. . .656-657 



Kilowatt 477 



Kilowatt-hour 477 



Kilowatts for candle-power 558 



Kinemacolor moving pictures. . . 392 



Kinetophone 393 



Kinetoscopc 400 



mechanism 418 



Kingsbury, Dr. F. B 324, 327 



Kircher, A. magic lantern . . .676-677 



Knife switch 515, 517 



Knife switch enclosed 517 



Knife switch vertical 516 



Kohl, Max 126, 153 



Kdhler method, substage con- 

 denser 278, 305, 619-620 



Koristka's drawing apparatus . . . 323 



Labelling lantern slides 218 



Lambert, F. C 200 



Lamp arc, 12, 74, 78, 80, 182, 236, 286 

 328, 339, 343, 401, 506, 536, 549, 

 628, 639, 652, 670 



Lamp, for general lighting 442 



for small currents 78, 286 



gas 125 



incandescent 14 



lime light . 105 



on house system 78 



with special condenser for 



house system 78, 343 



Lamp-house 14, 72 



window in 14, 72 



Landscape drawing, camera for 166 



Langenheim 673 



Lantern, college bench 301 



combined 176, 180, 182 



multiple 34 



testing 20 



Lanternists, work of early . . . 1 19-120 

 Lantern slides, actual size of 



opening 202 



American 201 



arranging 30 



black ground 213 



British, spotted 203 



coated with gelatin for writ- 

 ing 205 



collecting at close of exhibi- 

 tion 30 



coloring 217 



condenser to illuminate 204 



confusion of size 202 



correct position in carrier .... 26 



developing 209 



for showing c\ c defects 



656, 665, 666, 671 

 directions for making direct 201 

 directions for "spotting". .26, 216 



duplication 19 



film 215 



for experiments in vision. 65 1-672 

 for showing eye defects . . =5 56, 665, 

 666, 671 

 frame for retouching, 203 



with guide lines 206, 207 



hand-made 205 



in individual carrier 31, 32 



labeling 26, 218 



making 200 



mounting 216 



negatives as 211 



on mica or gelatin 208 



opaque 56 



order of 19 



photographic 208 



possible images of 27 



possible positions of American 28 

 possible positions of British .. 28 



printing with camera 213 



printing from negative 208 



rapid preparation 215 



sizes 200 



size of condenser required for 202 



size of image 464 



size of print on 208, 464 



size of screen for 464 



smoked glass 208 



