Make an octagon as directed in Lesson 39 (Making An Octagon). Be certain to have every side and angle correct. Any variation in the octagon is quite likely to show in the cylinder. Gauging the piece with the eye, plane off each corner, making the piece 16 sided. Then again plane each corner, making the piece 32 sided. Continue planing the corners, each time doubling the number of sides until the piece is practically cylindrical.

With a half sheet of No. 2 sandpaper, used as shown in Fig. 126, remove all plane marks. Finish with finer grades of paper used in the same manner until the piece is smooth and cylindrical. Usually the piece is simply moved endwise in the bent, but not folded or broken, paper; but sometimes, when the piece is quite rough, it is first revolved and then finished by moving endwise. The piece should be often reversed and not sanded too much at the ends. When finished it should feel quite cylindrical when held in the hand.

Fig. 126. Sandpapering a Cylinder.