Xvi CONTENTS, 



c>5i. Media for microscopic determinations of refractive indices: resin-like 



substances, noio-S^gf^) = 1.88 to 2.10 294 



352. Media for microscopic determinations of refractive indices: perma- 



nent standard resinous media, no = 1-546 to 1.682 294 



353. Optical constants of metals 295 



354. " " " " 296 



Reflecting Power 



355. Reflecting power of metals (see Table 359) 296 



356. Light reflected when incident light is normal to transparent medium . 297 

 ,^y_ " *' " n is near unity or equals i + dn, i = 0° to 90°. . 297 

 ,r8, " " " w = 1.55, *= 0° to 90°, polarization percentages. 297 



359. Reflecting power of metals (see Table 355) 298 



360. Percentage diffuse reflection from various substances 298 



361. Reflecting power of pigments, X = 0.44/x to 0.70/x 299 



362. Infra-red diffuse reflecting power of dry pigments 299 



363. Reflecting power of powders (white light) 300 



364. Variation of reflecting power of matt and silvered surfaces with angle 300 



365. Infra-red reflectivity of tungsten, temperature variation 300 



Transmissive Powers 



366. Transmlssibility of radiation by dyes, X = 0.44/x to 0.70/i 301 



267, " " " '' Jena glasses, 0.375 to T,.ifx 302 



368. " *' " " " " 0-280 to 0.644/i .... 302 



36g, " by Jena ultra-violet glasses, 0.280 to 0.397^1 .... 302 



370. " of radiation by glasses (American) 0.5 to 5.0/i . . . 303 



271. " by same glasses for various lights 304 



372. " of radiation by substances of Tables 330 to 338 . . . 305 



373. Color screens (Landolt) 306 



374. " " (Wood) 306 



375. " " (Jena glasses) 3°? 



376. TransmissibiHty of radiation by water, X = 0.186/x to 0.945/i .... 307 



377. Transmission percentages of radiation by moist air, 0.75/x to 20^ . . 308 



378. Long-wave absorption by gases, 23)U to 314/^ 309 



379. Properties with wave-lengths 108* /i: 



(a) Percentage reflection 3^9 



(jb) Percentage transparency 3^9 



(c) Transparency of black absorbers, 2fx to loSfX 309 



380. Rotation of plane of polarized light by solutions 310 



381. ♦« " '« " " " " sodium chlorate and quartz . 310 



382. Electrical equivalents S^' 



