led a Cap or back iron, which isplaced, as its name indicates, on the back of the cuttingiron, thus making it a double Iron. The purpose of theback iron is to break the shaving as it is made by thecutting wedge. The exact way in which this is done can be explainedbetter with a cut than with words… … Fig. 36. wedge, its tendency is to follow the back of the planeiron as at A, Fig 36. As seen at A, Fig. 37, the backiron prevents this, by changing its course and breakingit before it has time to split down into the wood.The single iron does very good work so long as thegrain is favorable, but when…
Patternmaking
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