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When the genuineness of a bank-note is doubted, the Lathe Work on the note should first be closely scrutinized. The several letters of denomination, circles, ovals, and shadings between and around the letters in the words, etc., are composed of numberless extremely fine lines—inclusive of lines straight, curved and network. These are all regular and unbroken, never running into each other, and may be traced throughout with a magnifying glass.

Without the skill or machinery, by which the genuine is produced, the same quality of work cannot be done. Therefore, in a counterfeit, the lines are imperfect, giving the paper a dull or hazy aspect, that may be all the better appreciated by comparing it with the genuine. The lines in the counterfeit will be found now and then irregular in size, and broken: not uniform in course, sometimes heavy, sometimes light: no two stamps or dies on the same note being exactly alike.

The fine, uniform, shade-lines, with which the letters on the genuine are embellished, are wrought by a machine that cannot be reproduced by counterfeiters, nor used for other than legitimate purposes, by authority.