This material is so valuable for many purposes that many mechanics will find it useful to know how to make it, as they can then provide themselves with any size and length that may be needed. The process is quite simple. Take the entrails of sheep or other animals, remembering that fat animals afford a very weak string, while those that are lean produce a much tougher article, and thoroughly clean them from all impurities, attached fat, etc. The animal should be newly killed. Wash well in clean water and soak in soft water for two days, or in winter for three days; lay them on a table or board and scrape them with a small plate of copper having a semicircular hole cut in it, the edges of which must be quite smooth and not capable of cutting. After washing put them into fresh water and then let them remain till the next day, when they are to be well scraped. Let them soak again in water for a night, and two or three hours before they are taken out add to each gallon of water 2 oz. of potash. They ought now to scrape quite clean from their inner mucous coat, and will consequently be much smaller in dimensions than at first. They may now be wiped dry, slightly twisted, and passed through a hole in a piece of brass to equalize their size; as they dry they are passed every two or three hours through other holes, each smaller than the last. When dry they will be round and well polished, and after being oiled are fit for use.