...ones due to Perrine and to the present investigation. Of these, the possibility noted under ( b ) , that the small nebulae may conceivably occur in greatest...this paper, that at least 700,000, and very probably 1 ,000,000 small spirals are within reach of large reflecting telescopes. т In order that those who...

...of the NG C, would appear to be the only reason for changing the larger estimates, and this evidence is only to be secured by taking many additional plates...estimate made in this paper, that at least 700,000 small spirals are within reach of large reflecting telescopes. . Because of the fact that the faintest...

...believes that the coarse-grained plates used by him militated against discovery and concludes by stating that at least 700,000, and very probably 1,000,000...spirals are within reach of large reflecting telescopes Part II. Occulting Matter in the Spiral Nebulae, by HD Curtis. It has long been known that certain...

...taken at Lick by the 36-inch Crossley reflector of over 400 regions of the sky, HD Curtis,1 concluded that " at least 700,000 and very probably 1,000,000...are within reach of large reflecting telescopes." These small nebulae were not, however, clearly distinguishable on the photographs as certainly spiral...

...of the NGC, would appear to be the only reason for changing the larger estimates, and this evidence is only to be secured by taking many additional plates...estimate made in this paper, that at least 700,000 small spirals are within reach of large reflecting telescopes. Because of the fact that the faintest...

...of the NG C, would appear to be the only reason for changing the larger estimates, and this evidence is only to be secured by taking many additional plates...estimate made in this paper, that at least 700,000 small spirals are within reach of large reflecting telescopes. Because of the fact that the faintest...