ered out after it is connected to the back, all sell deems it an advantage of a Newtonian reflecting tele- tween c and., the materials may be considered as being suf- of which is avoided by this improvement. scope, when the alloy of the specula is well compounded, ficiently pure. A Bunsen flame,… … nish or other suitabie these instruments together. Hence the motion of a fixed — substance to close its WANNA x star in space, or of a whirlwind on the sun, may be measured able the experimenter to determine when the evolution of pores aud prevent the’ by the change, in refrangibility, which…
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