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angles, and it is impossible to repair them. The other requirements of the student of mechanical graphics, apart from what are known as instruments, are some pencils, drawing- pins, rubber, paper, and ink. A few words descriptive of the qualities that should obtain in each of these articles, that satisfactory work may be done, will be of advantage to him. Pencils. The present great demand for pencils has, notwith- standing the millions that are annually made and sold, added few to the number that are specially suited to the wants of the mechanical draughtsman. Many erroneously assume that any sort of pencil will suit a learner. No greater mistake can be made. If he is to acquire a draughtsman's habit of work, his first necessity will be a good, serviceable, reliable pencil one that is neither too hard nor too soft, and that will retain a good point for a considerable time. The pencils now generally used in drawing offices are of Faber's make, which can be had of different degrees of hardness from H to six H's, the cedar covering of the lead being hexagonal in form, instead of round. But such pencils are too expensive for students' use. A good, serviceable pencil, made by Cohen, and known as the " Alexandra H pencil," has been in use by the writer for some years, and costs about half the price of Faber's. They are, however, of the ordinary round form, which is inimical to the draughtsman, it tending to cause them to be constantly rolling off his board and damaging their points. To obviate this, the writer's practice is to cut a flat side on the pencil throughout its whole length, taking care not to bend the pencil in doing this for fear of breaking the lead. If neatly done a perfectly flat side is produced, which serves as a guide to the way in which the pencil should be