Compton, Alfred G. (Alfred George), 1835-1913 · New York : J. Wiley & Sons · leaf 153
the front and rear edges of the work more than the middle, and will produce a curved surface ; but if you keep the file quite level and move it with long strokes, you will cut equally across the whole breadth, and produce a plane surface. Test your work with respect to this point from time to time… … diagonals; but if it is applied parallel to both diagonals and both edges, it will be impossible for
Metal-work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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