7 i8 



OPTIC PROJECTION 



Light, centered on objective 



face 44 



centering by objective hood 246 

 closing angle for screen 



image 611 



direct on screen 52 



distribution of intensity . . 562-563 

 distribution in semi-diffuse 



reflection 459 



distribution from white screen 



462-463 



early sources 1 19, 686 



energy, proportion of total 



radiation 566, 569 



flux 172, 613, 614 



flux in opaque projection .... 172 

 from converging carbons . 564-565 



from right-angled arc 564 



in exhibition room. .112, 161, 441 



increasing with sunlight 161 



insufficient 51 



on screen in 



on screen, insufficient 301 



parallelizing 273, 276, 335 



projection with feeble 120 



red near exits 443 



reflection with various screens 



249, 250 



relative amount with trans- 

 parent and opaque projec- 

 tion 171 



shield beyond objective .... 246 

 shield on the window frame 



445-447 



sun most brilliant. ... 138, 619 

 sources, arc lamp, oil, gas, 

 acetylens, lime and mazda 

 lamps ; sunlight 

 11, 79, 100, 119, 125, 127, 138 



sources for spectra 627-628 



source, parts of 537, 547 



size and brilliancy of 



screen image 610 



stray, how to cut off 266 



stray, vertical microscope. . . 268 

 stray, effect on screen image 



443-444 

 turning on and off .20, 88, 1 10, 162 



unequal on screen 308 



weak for micro-projection ... 287 



Light losses by, 601 



absorption by lenses and 



object 601-602, 619 



polarization 603 



reflection from lens surfaces 



601-602 

 shutter in moving pictures . . . 603 



sheet mica 608-609 



small condenser or objective 



601-602 



substage condenser 618-620 



Lighting, blackboard, 448-449 



entire opaque object 187 



indirect method 442 



Lilliput lamp 81 



Limes, for lime light 104 



Lime, arranging 109 



cracks in 115 



pitting of 109 



putting in place 108 



rotating 109 



warming 108 



Lime light 100 



burner 102 



connectors 108 



lamp for 107 



lighting 106 



management 106 



micro-projection by 287 



oxygen generator and ether 



saturator 113 



oxygen and illuminating gas 112 



regulating flame 108 



shield in 



snaps out 114 



starting 106, 1 10 



summary 117 



troubles 114 



turning out no 



Litmus polarity indicator 510 



Long sight or hyperopia 66 1 



Loos, A. J 673 



Loss of light 601-609 



Loss of energy 603-609 



Lumen 613 



McAllister 167 



Mclntosh Bat. and Opt. Co. ... 123 

 Mclntosh Stereopticon Co. . .62, 301 



Maddox 682 



Magic disc 680 



Magic lantern, 9, 68, 78, 100, 119, 138, 

 414, 584-587 



acetylene 127 



addition of micro-projection 309 



advertizing form 435 



American forms 59 



