trips of Princes metal, is in thevertical axis of the knife. Owing to such an arrangement,the knife, rolling at one side in the bracket, and at theother on the spring, is always pushed to the right or leftwithout ever resting in the median position, which is one of through its action on the… … spring might compensate for the wear on these parts, theinventor desired to obtain certain data in regard to tljispoint. So, with a file, he executed the work of time on theknife, and, with thirteen pieces worn away each a half mil-limeter more than the other, he undertook a series ofexperiments on…
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