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716
OPTIC PROJECTION
Janssen astronomer, pictures of the transit of Venus with a photographic revolver invented by him in 1873 (see Marey, Hist. Chronopho
tography) 683
Jablochoff, arc lamp with parallel carbons (see Silvanus P.
Thompson) 686
Jenkins, C. F 391, 686
Journal of Applied Microscopy. 289 Journal Royal Microscopical Society 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 condenser 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 writing 205
collecting at close of exhibition 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