INDEX 



PAGE 



Abbe diffraction theory 644-647 



apparatus for 644 



demonstrating to an audience 

 and to an individual . . . 646-647 



grating needed for 644 



light for 646 



Abbe substage condenser 



273, 280, 626 



Abbott, the Sun 139 



Aberration, chromatic and 



spherical 580-583 



maximum and minimum. 582, 589 



Absolute temperature 547 



Absorption spectra 637-638 



comparison spectrum with 



637-638 



glass box for use with 637 



substances for 637-638 



Accommodation in vision 



651, 656-659 



Kepler's theory of , . 657 



lantern slide for experiments 656 



necessity for 657 



produced by muscular effort 659 



Scheiner's theory 658 



Acetylene, flame and lamp. .127-130 

 amount in prestolite tank. . . 129 



position of lamp 128 



summary 135 



Achromatic and aplanatic com- 

 binations 581-583 



substage condenser 272, 626 



Adam's Essays 142 



Adapters for small carbons in 



large lamp 80 



Advertising Magic Lanterns .... 435 



a-k on microscope slide 361, 387 



Alcohol, burner 130 



ethyl, methyl and denatured 



supply 130 



Alcohol lamp 131 



lighting 131 



precautions, with 133 



putting out 133 



summary for use 137 



Alco-radiant 130 



Alternating current 475 



advantages 475 



PAGE 



amperage 484 



arc 54 2 



arc, form of lamp 68 



ballast with 544 



carbons for 87, 552 



cycle 486 



disadvantages with arc lamp 



68, 475 



frequency 486 



how produced 475 



magic lantern with 68-77, 87 



micro-projection with 284 



power factor with 485 



radiant efficiency of arc. .568-569 

 summary for use with the 



magic lantern 76 



units of 484 



voltage 484 



watts with 485 



wiring 69, 512 



Ambronn's Handbuch, Astrono- 



mische Instrumente 138 



American, Institute of Electrical 



Engineers 500 



Journal of Science 157 



lantern slides 200, 201 



Microscopical Society 383 



Ammeter 479, 510 



alternating current 73 



connections 480-482 



direct current n, 481 



does not register 52, 510 



external shunt 479 



in projection 236, 481 



need in micro-projection .... 236 



precautions for use 481 



self-contained shunt 479 



soft-cored 510 



to measure current 479 



testing polarity with 509, 510 



Amperage 476, 484 



alternating current 484 



carrying capacity of copper 



wires 500 



cords and cables 501 



for different forms of projec- 

 tion 500 



found by Ohm's law 521-522 



