712 



OPTIC PROJECTION 



size condenser to use 331 



size and lettering 376 



small 330 



small arc lamp, for 340 



summary 388 



surface horizontal 322 



surface vertical 32 1 



table 324 



with mirror attached . 323-325 

 with movable shelf . . . 325-326 



tracing 374 



troubles in 384 



varnished slides for 205 



wall diagrams 329 



Dresbach, Dr. Melvin 651 



papers on eye defects 659 



Durand, Dr. Albert C 651 



Dust to show light rays 247 



Dynamo 474 



connected directly to arc lamp 



486-488 



special for arc lamp 486 



wattmeter to measure power 

 delivered by 482 



Eastman Kodak Co. ...212, 215, 319 



Eclipse voltmeters and ammeters 510 



Ecliptic 163 



Edinger 345 



apparatus, erect images with 373 



large apparatus 360-362 



outfit for small arc lamp and 



ordinary microscope 363 



vertical apparatus 360 



Edison, Thomas A., figures loaned 

 by and text references 



113, 400, 406, 418, 429, 435, 686 



"Effects" with multiple lanterns 34 

 with single lanterns 36 



Efficiencies of current and car- 

 bon arrangement 560-562 



Electric, apparatus, list of. .474, 499 



arc 535-538 



circuit 496 



fan for drawing room 320 



flashlight 14 



measurements 475-486 



supply, connections to ... 502-505 

 units 475-478 



Electrical behavior of arc . . . 536, 539 

 World 553 



Electrodes, of carbon 539 



and potential drop at arc 536-539 

 for spectra 627, 638 



stuffed with various sub- 

 stances 638, 639 



Electromotive force, unit of .... 476 



Emission spectra 638-643 



arrangement of the electrodes 



for 640 



automatic arc lamp for ... 638-639 



current to use for 639 



different appearances with 

 positive and with negative 



electrodes 640 



electrodes for 640 



yellow-flame carbons for. ... 638 



Enclosed knife switch 517 



Energy losses in projection . . 603-609 

 comparison of in water, etc . . 607 



example of 609 



in the condenser 604 



in the projection objective . . 609 



in sheet mica 608 



in the specimen 607 



table of 607 



Energy, required for projecting 



moving pictures 57O-57 1 



with inductor and rheostat . . 533 



Energy transmission 606 



table of absorption and trans- 

 mission 607 



English Mechanic 221 



English Photographic Club 29 



Enlargements with projection 



apparatus 378 



Enterprise Mfg. Co 101 



Episcope for drawing 332 



Equivalent focus 580 



Erect images, in drawing .... 359-373 

 with two projection lenses 368 



Ether saturator 113 



Ewon's automatic lamp 548 



Exhibition, with, alcohol light. . 132 

 alternating current lantern . . 73 

 direct current magic lantern 19 



high powers 271 



lime light no 



mazda lamp 92 



moving pictures 433~435 



Nernst lamp 95 



opaque lantern 179 



projection microscope 270 



room lighting, 19, 52, 66, 96-99, 

 1 12, 120, 143, 175, 235, 303, 314, 

 320, 395, 441-443, 626 , 6 33 

 with small arc lamp 90 



