e 17 Ibs. tions in a very powerful manner. The screw holes are coun- article claims to offer advantages over awy other couplings tersunk so as to bring the heads of the screws below the sur- which have preceded it. Whether so broad a claim as this is 1,080 lbs. face, when they are screwed home, and… … tially filled with mercury. This mineral has the peculiar It is not known by everybody, says George M. Steele, in Old and New, though perhaps most people have been told of justified by its merits, we leave our mechanical readers to quality of losing its centre of gravity quicker even than water,…
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