The Century illustrated monthly magazine . tle more closely. It is clear thatit is only the surface of the cylinder which cor- 458 WHAT IS THE REAL SHAPE OF THE SPIRAL NEBULAE? iesponds to the drawing a or b. The interiorvolume has nothing to do with the it is clear that the surface of thecylindric sheet corresponds exactly to the draw-ing. And in this way : any curve drawn on thesurface of the cylinder A must be projected backon the sky in one and the same curve a. Drawany curve whatever on the surface of the cylin-der and in general it will be projected back onthe sky in the
The Century illustrated monthly magazine . tle more closely. It is clear thatit is only the surface of the cylinder which cor- 458 WHAT IS THE REAL SHAPE OF THE SPIRAL NEBULAE? iesponds to the drawing a or b. The interiorvolume has nothing to do with the it is clear that the surface of thecylindric sheet corresponds exactly to the draw-ing. And in this way : any curve drawn on thesurface of the cylinder A must be projected backon the sky in one and the same curve a. Drawany curve whatever on the surface of the cylin-der and in general it will be projected back onthe sky in the one curve a. or ribbons of nebulous matter twisted about acentral nucleus and seen by us in the form ofa spiral curve. There are many other classesof nebulas, as those with circular or oval disks— the planetary nebulae; those consisting ofone or two straight parallel rays; those dis-posed in Qval rings, etc. We are now con-cerned only with the spiral nebulse, and figuresI and 2 are the most striking of these whichwe may select as
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Keywords: ., bookauthornicolayj, bookcentury1800, bookdecade1890, bookyear1890
