INDEX 



707 



Arc lamp 12, 15, 61, 401, 536 



alternating current 68, 72, 74 



automatic 12, 61, 83, 328, 364, 512 



ballast for 539, 544 



choke coil for. ... 88, 352, 532, 544 

 direct current 



candle-power 553-565 



carbons for 87,551 



current needed . . . .24, 248, 328 



drawing with 328, 341 



for spectra 628, 639 



for micro-projection 236 



for vision experiments.. 65 1-672 

 fine adjustments for. . .12, 72, 237 



going out of 48 



hand-feed 12, 62 



house circuit 80 



inductor for 88, 352, 544 



installation of 500-505 



intrinsic brilliancy of crater . . 564 



lighting 21, 24, 88 



"Lilliput" or baby form 81 



managing 24, 414 



material for installation 502 



opaque projection with 182 



polarity test 84, 506-511 



position of carbons in 



V 49, 50-51, 61, 70, 72, 550, 553 



rheostat for 



ii, 70, 83, 521, 539, 544 



small 81, 82 



small automatic 83, 364 



small carbons for 341 



small with clock-work 364 



small with drawing 340 



special dynamo for 486 



starting 23 



summary for small 97 



testing polarity 506-512 



three- wire, automatic 238, 263, 512 



three-wire, supply 514 



turning off 88 



with transformer 532-534 



wiring 15, 69, 496-505, 513 



wiring when far from main 



.supply 513 



wiring for large currents ... 513 



Arrhenius 138 



Asbestos-patch gloves 21, 74 



Astigmatism, astigmia or un- 

 equal curvature 663-669 



change with age 666 



correct position of spectacles 

 for .666 



correction by cylindric lenses 



665-666 

 correction by obliquity of 



spectacles 665 



correction by stenopaeic slit 



669-670 



demonstration of 663-668 



discovery of by Young and 



Airy 666 



radial lines for 662-665 



Atmospheric pressure 103 



Attachment plugs . . . .86-87, 502-504 



Auditorium for projection . . 395, 439 



Automatic arc lamp, 12, 61, 83, 286, 



328,334, 336,364, 512,639 



Bausch and Lomb form 512 



Ewon's 548 



Leitz 364 



Nernst 92 



Reichert's 83 



Thompson's 334 



Axis of lenses 576-581 



principal, and secondary . 576-579 

 Ayrton, Mrs 539 



Balancing devices 521, 532 



Ballast, alternating current 



69-70, 521, 532, 544 



direct current u, 521, 539 



moving pictures 399 



need with arc 539, 544 



Nernst lamp 92 



position of 512-513 



small arc 83 



Ball's Astronomy 139 



Ball-pointed pen on unvarnished 



glass 187, 207, 304, 306 



Balopticon, 



diagrams 188, 189 



Edison Moving Picture at- 

 tachment for 405 



large for opaque objects 192 



Nicholas Power, moving pic- 

 ture attachment 404 



home 184 



Balopticon, convertible. 187, 304, 306 



Universal 191, 307 



Barbara 675 



Barrel, rheostat 526 



Baseboard, for home-made ap- 

 paratus 288-296 



fixing track to 290 



