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This being done, and the places marked levelled down, using spoke shaves, flat gouge No. 50, and rough sandpaper 3, take again the large calipers and go over the whole as before, but more carefully; and do this time after time, until the plate is accurately gauged from five-thirty-seconds of an inch centre to the diminution of about a good sixteenth say one-twelfth of an inch at the edges.
Turning the plate to the outer side, I press it flat, between the square let into the bench and the three-inch slip clamped about fifteen inches apart, as spoken of before. This is done so that it may be rigid whilst I take one-inch rasp 47, and proceed to level all round the wood to about five-eighths of an inch and five-thirty-seconds of an inch deep.
Then I take this specially-made purfling tool, No. 13, with its tracers fixed for marking the two parallel lines about five-thirty-seconds of an inch from the perfect outline of the back, and I grasp the handle in both hands perpendicularly, pressing the revolving wheel against the edge, of course, and keeping the steel markers going carefully and with only slight pressure all round the instrument, stopping without running off at the corners, however.
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