ell as interested at tity of air amongst the steam that is to supply a steam en- represented in our illustration. Its magnifying power, in gine has been found to produce improved economy of heat the odd names given to oil wells in the oil regions, says tho other words, is 3,000 times, and as the… … spheres would produce a rise of 390° Fahr., while ly settled through the convincing agency of di- THE LARGEST REFRACTING TELESCOPE, the actual rise required is only 84° Fahr., and rect optical proof. pleted each month, and to each must be given a name by without going into a minute calculation of…
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