springs thereby giving ample time for the current t act to its fullest extent. It is perhaps unnecessary for us to enlarge upon to any one who will examine it after acquiring a mode rate knowledge of other systems of rapid telegraphy. TEMPERATURE OF THE MOON IN SUNSHINE.--The Most recent researches of Professoi S. P. Langley indi cate thatt he mean temperature of the sunlit lunar GROUND, scientific american, 1889-12-28
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