Pendulum clocks are the oldest style, and are more generally introduced than any other kind. I will give a few simple suggestions essential for keeping this clock in good order as a time-keeper. In the first place, a clock must be plumb (that is level;) and what I mean by plumb, is not treing up the case to a level, but it is to put the case in a position so that the beats or sounds of the wheel-teeth striking the verge are equal. It is not necessary to go by the sound, if the face is taken off so that you can see the verge. You can then notice and see whether the verge holds on to the teeth at each end the same length of time; or (in other words) whether the vibrations are equal as they should be. Clocks are often condemned because they stop, or because they do not keep good time, while these points and others are not in beat, the vibrations are not regular; hence it will not divide the time equally, and it is called a poor time-keeper, when the difficulty may be that it is not properly set up. A clock which will run when it is much out of beat, is a very good one, and it must run very easily, because it has a great disadvantage to overcome, viz: a greater distance from a perpendicular line one way than the other in order that the verge may escape the teeth. A clock may be set up in perfect beat, but the shelf is liable to settle or warp, and get out of beat so gradually, that it might not be remarked by one not suspecting it, unless special notice was taken of it. This matter should be looked to when the clock stops. I have explained the mode of setting up a clock with reference to putting it in beat, etc. Another essential point to be attended to is that the rod should hang in the centre or very near the centre of the loop in the crutch wire which is connected with the verge, and for this reason, if it rubs the front or back end of the loop, the friction will cause it to stop. To prevent this, set the clock case so that it will lean back a little or forward, as it requires. It sometimes happens that the dial (if it is made of zinc) gets bent in, and the loop of the crutch wire rubs as it passes back and forth. This should be attended to. It should be noticed also, whether the crutch wire gets misplaced so that it rubs any kind of a dial; the least impediment here will stop a clock. The centre of the dial should next be noticed. It sometimes happens that the warping moves it from its place, so that the sockets of the pointers rub, and many times it is the cause of the clock's stopping; this can be remedied by pareing out the centre on the side required.