XVI CONTENTS 



343. Glare sensibility 331 



344. Rate of adaptation of sensibility 331 



345. Apparent diameter of pupil and flux density at retina 332 



346. Relative visibility of radiation (international standard — 1924) . . 332 



347. Miscellaneous eye data 332 



Photometric Tables 



348. Photometric definitions and units 333 



349- standards 334 



350. Waidner-Burgess standard of light 334 



351. Intrinsic brightness of various light sources 334 



352. Brightness, Crova wave length, mechanical equivalent of light . . . 335 



353. Luminous and total intensity and luminous efficiency of black-body. 335 



354. Color of light emitted by various sources 335 



355. Blue brightness B, brightness in candles of incandescent oxides . . 336 



356. Efficiency of various electric lights 337 



357. Color and brightness temperatures, and brightness of illuminants . 338 



358. Temperature, efficiency, brightness of vacuum lamps 338 



359. Temperature, efficiency, brightness of gas-filled tungsten lamps . 338 



360. Energy distribution for some tungsten lamps 339 



361. Brightness of some tungsten lamps and other sources 339 



362. Characteristics of some miniature lamps 339 



363. " sunlight Mazda lamp (Si) 300 w, a.c 340 



364. " photoflash lamp 340 



365. Visibility of white lights 340 



Photographic Data 



366. Sensitometric constants of type plates and films, definitions .... 341 



367. Formula for laboratory pyrogallol developer 341 



368. Sensitometric constants of type plates and films 342 



369. Resolving power, sharpness, and astro gamma, definitions .... 342 

 3/0. " " " " " " data 343 



371. Relative spectrum sensitivity of various plates and films 343 



372. Spectrum sensitivity of photographic materials 344 



373. Relative photographic efficiency of illuminants 344 



374. Variation of resolving power with plate and developer 345 



375. Relative intensification of various intensifiers 345 



376. Reflection and transmission by photographic plates 345 



Spectrum Wave Lengths 



377. Wave lengths of Fraunhofer lines 346 



2/8. Primary wave-length standard. Definition of Angstrom 347 



379. International secondary standards. Iron arc lines 347 



380. Computed wave lengths of iron arc lines 349 



