About the Book
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908. Excerpt: ... Newton: analysis of sunliaht, 47; advan-tages of high altitudes. 111. Nichols: stellar heat, 172. Olmsted: calcium hydride in spots, 163. Origin of Species, 1. Orion Nerula, 44, 188-90; Trapezium stars, 188. 190. "Orion" Type Stars, 79,190. Photography: advantages, 28: star trails, 29: with camera, 29-33; clusters, 33, 44; Moon, 33, 34; with Yerkes tel-escope, 33-36; with reflectors, 40-45; of nebulae, 41-45, 203: solar spectrum, 60-64, 247. 248; Sun. 70-72, 244, 245; eclipse, 74-76; with spectroheliograph, 81-96, 139-42, 149. 150, 236, 237. 248; stellar spectra, 104,105,165-71.189-97.203; coro-na, withont eclipse, 115-18; Milky Way, 128, 129; with Snow telescope, 137, 138; sun-spot spectra, 152-54; metallic spec-tra, 158-62. Photosphere: structure, 69-72. Physics: fundamental importance of, 5. Pic Du Midi, 119. Pickering. E. C.: objective prism, 189; stellar spectra, 201. Pike's Peak: expedition to, 115,116. Planetesimal Hypothesis, 208-10. Pleiades, 18. 44,129, 177, 198. 202. Potsdam Astrophysical Orservatory, 100, 167. Prism: formation of spectrum, 48; ob-jective, Fraunhofer, 189; objective, Pickering, 1-9; glass, 236. Prominences. 15: nature of, 76; withont eclipse, 77; spectrum, 78; seen with open slitj 81; quiej-cent and eruptive. SI, 93; photography of, 82; H and K in, 84. Pyrheliometer, 215. Quartz: fused, for telescope mirrors, 233-35. Radiometer. 172. Radiim. 212, 213. Ramsay: discovery of helium, 78. Reversing Layer, 113. Ritchey: photographs of Moon, 33, 34; photography with Yerkes telescope,33, 36; 24-inch reflector. 43: photography with reflector, 44: telescope construc-tion, 43, 219-30; 100-inch reflector, 238-40. Ritchey And Barnard: photography of corona, 76. Rorerts: Atuiromeda nebula, 41. Rosse: 6-foot reflector, 38, 39. Rotation: ...