Popular science monthly . Where large quantities of brass and iron filings accumulate this magnet will be found invaluable for separating them remo\ei. THK harder the boatmoored on thenew self-locking moor-ing-hook pictured be-low pulls, the lesschance there is for theboat to get loose, inuse it is merely neces-sary to toss the hookinto the e\ebolt on thedock or buoy and the\acht is fast, since itautomatically locks, al-though there arc nosprings in thede\ice. Toloosen it a poke of theboat-hook is lock is composedof anordinar\ hook, tothe tip of which isattached a le\-cr,which c
Popular science monthly . Where large quantities of brass and iron filings accumulate this magnet will be found invaluable for separating them remo\ei. THK harder the boatmoored on thenew self-locking moor-ing-hook pictured be-low pulls, the lesschance there is for theboat to get loose, inuse it is merely neces-sary to toss the hookinto the e\ebolt on thedock or buoy and the\acht is fast, since itautomatically locks, al-though there arc nosprings in thede\ice. Toloosen it a poke of theboat-hook is lock is composedof anordinar\ hook, tothe tip of which isattached a le\-cr,which catches apiece of steel in theshank of the hooknuich as a door-latch is caught. Itcamiot be loosenedunless the upperend of the catch ispushed is accomplish-ed by a thrust ofthe fingers or of abt)at-hook in theo|)posite directi(Mi,from that inw hiclithe boat itself ispulling. .Ail pulls on theline itself are tak-en up by thehot) the linebe twisted, so asto ])ull in theo|)posite direc-tion, the pull istaken up 1)\ thelexer which and held. The hnrdt-r tlir boatpulls on the hook theless chiincc it has oflircaking loose
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
