TIN6 JACK. lenger. for the determination of the saltness of the sea at different We illustrate herewith a new and simple lifting jack, ap- depths and localities. The new instrument resembles a RESULTS OF THE CHALLENGER EXPEDITION. The following observations are reported by Professor spectroscope… … stances where the test of propor- constructed. ROWLAND'S IMPROVED LISTING JACK. tion was carefully tried, it was Patented through the Scientific found that more than half the mud American Patent Agency, February consisted of shell fragments. There is no doubt that a stra- be examined is poured into…
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