James Slough Zerbe, Practical Mechanics for Boys
“ File Practice.—The file is a good tool to pick up first. Select a piece of metal, six or eight inches long, and follow the instructions laid down in the chapter relating to the use of the file.Practice with several kinds and with different varieties of material will soon give an inkling of the best kind to use with the metal you have. Use the straight edge and the square while the filing process is going on, and apply them frequently,p. 62 to show you what speed you are making and how nearly true you are surfacing up the piece. ”
