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Re-Sharpening Files

A very interesting and economical process has been exhibited before the Société d'Encouragement steel punch and a hammer, give a gentle tap of Paris, by M. Werdermann. Well-worn on every alternate tooth. Reverse the saw files are first carefully cleaned by means of and punch the alternate teeth on the other hot water and soda; they are then placed in side, and look down the saw to see that the connection with the positive pole of a battery, teeth are all equally set. Then begin with in a bath composed of 40 parts sulphuric acid, your file at that part of the saw nearest the 80 parts nitric acid, and 1000 parts water. handle. To sharpen or file the teeth to a The negative pole is formed of a copper spiral good point, hold the file so that it makes an surrounding the files, but not touching them; angle with the saw-blade of about 30 degrees, the coil terminates in a wire which rises or that of a mitre angle. Then file every towards the surface. This arrangement is the other tooth to a very sharp point, sharpening result of practical experience. When the files and tightening the whole by pulling d. As formed in this mode, it is more rapidly made have been 10 minutes in the bath they are taken out, washed, and dried, when the whole of the hollows will be found to have been than almost any attacked in a very sensible manner; but otherknot; and, should the effect not be sufficient, they are as before stated, replaced for the same period as before. Two it excells all in operations are sometimes necessary, but rare-security and ly more. The files thus acted upon are, to all compactness; so appearance, like new ones, and are said to be firmly do the good for sixty hours' work. various turns