INDEX 



Oxygen-ether 114 



generator 113 



use of 113 



tank 102 



Oxy-hydrogen flame 100 



Oxylithe 113 



Paint, amount for cloth screen . . 456 

 for blackening apparatus .... 245 



for projection room 440 



Painted cloth screen 457, 460 



Painted wall screen 454 



Paper, holding while printing. . . 379 



Paper for masks 253 



Paper for printing with projec- 

 tion 379 



Paper screen 458 



Parallel light, how to obtain. ... 273 



Parallel, rheostats in 531 



Parallelizing light 276, 335 



Patching a film 428 



Pen for slides . 206, 207 



Pennock, Edward 673 



Pennsylvania Metallic Tubing 



Co 108 



Petroleum, amount to use 125 



lamp 121, 123, 124 



lamp, amount of oil 125 



lamp, candle-power 125 



chimney 122 



condenser position 125 



management 123 



lamp for photo-micrography 386 



position of flame 125 



reflector 122 



smoking 133 



summary 136 



Phenakistoscope or magic disc of 



Plateau 680-681 



Photographic booth 321 



camera for drawing 332 



enlargements with projec- 

 tion 378 



lantern slides 200, 208 



objectives for prints 379 



for projection 224 



objects to project with .... 268 



paper with projection 379 



room 320 



Society, British 217 



Photography apparatus 319 



with projection apparatus 



319,381 



with Quartz spectrograph . . . 642 



Photography, with spectra 643 



summary 388 



troubles 384 



Photo-micrographic camera. . . . 382 



microscope 385 



vertical camera 384 



Photo-Mineature Series 200 



Physical Review 567-569 



Physics, special projection ex- 

 periments in 622 



Plaster Paris screen 454 



Plate, exposing directly 381 



Plateau and moving pictures . . . 680 



Pointer for lecturer 271 



Polarity determination 506-5 1 1 



by arc lamp 506 



with direct current. .496, 506-511 



direct current ammeter 506 



direct current voltmeter. . . . 508 



incorrect 51, 507 



indicating on wires 51, 508 



indicators, chemical 510 



Nernst lamp 95 



right and wrong in arc lamp 



51,507 



small arc 84 



test 51, 506-511 



testing by ammeter 506 



testing by voltmeter 508 



Polarized attachment plugs. .87, 504 



light 622-626 



brightness of screen image 626 

 condensers and objectives 



for 625 



dark room needed for experi- 

 ments 626 



detecting strain in lenses by . 626 

 projection experiments with 



622-626 



setting up the experiments. . 626 

 showing rings and brushes 



with 625 



small Nicol prism for 624 



specimens for 623 



use of piles of glass plates . 623-624 



use of small prisms 624 



wall socket 86, 503 



Popular Science Monthly . . .321, 521 

 Porta, Baptista and the camera 



obscura 674 



Porte lumiere 140, 144 



installation 140 



with microscope 142 



operation 143 



