The first thing to do is to provide our cylinder with an axis. The simplest way to mount it is to run a hard wood stick right through the centre, the stick being only just large enough to pass, but the most workmanlike way is to fit it with two hard wood ends. Unless, however, this be done with great accuracy, the cylinder will not be properly centred, and the result will be a failure. For beginners, therefore, it may be advisable to retain the central spindle. Before inserting it thoroughly clean the cylinder inside and out.
Fig. 2.
Fig. 3.
The spindle should project a few inches at each end; and to hide the glass collars and give a strong grip, a pair of ends (see [Fig. 2]) should be cut or turned which can be slipped down the stick. These can be fastened to the glass with cement, and further kept in place by a fine screw or French nail driven through to the centre so as to just avoid the glass. In the case of the spindle not being driven through, the ends are made longer, and on them the cylinder works. We have here ([Fig. 3]) the cylinder A duly fitted with the central spindle B, with the collar C shown by itself and in position, and the handle D slipped on to the squared end of the spindle. This handle should be made to fit firmly, and it is best to cut the square hole in it first and then to cut the spindle end to suit it. Like the rest of the machine it should be of hard wood, and should have all its corners and edges sand-papered off.
Fig. 4.
Fig. 5.