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Learning metalworking, metalcraft. Metal trade education. Hobbysmith. WORK IN COPPER: How to Make a Copper Bowl. page 23, How to make a copper bowl, File the top with a smooth file until it is perfectly true. A good test to make sure of this is to lay the bowel down on a plate of glass, or hold it against a window pane. |
Working in Metals by Charles C. Sleffel