Vaughn, Samuel Jesse, b. 1877 · Bloomington, Ill. : Public school pub. co. · leaf 43
chases.There are two chief kinds,one consisting of two sep-arate wedge shaped piecesof hard metal w i t hnotched sides, which bythe use of a key are madeto slide in opposite direc-tions against each other.The danger of thesequoins in the hands ofschoolboys is that, notrealizing how easily good… … FIG. 22. IMPOSITION 33 and opened by the use of a key operating a nut which, af-ter a sHght expansion of the quoin, releases its hold andallows the parts to spring back together. This c|uoin issafe for the form and for the chase, and is itself not bat-tered in the process of locking up. After the…
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