Weight Driven, Pendulum Regulated?string

What does Weight Driven, Pendulum Regulated mean?
Well, these types of clocks are really just a falling weight, that is slowed down or regulated by the escapement and a by-product of that regulated fall, is that the mechanism tells us the time.
Weight Driven...
To 'wind' the clock the weight is lifted and the string that it is hanging on recoils around a small 1inch wheel. When the weight is released, it 'wants' to fall with gravity. This is where the power to drive the clock comes from...not electricity. Obviously, when the weight eventually touches the ground, the clock stops running.
Pendulum Regulated...
The power from the weight is distributed through the gear chain of the clock up till it gets to the escapement. There are many types of escapements, but they all do the same thing, they change a oscillating motion (the pendulum) into a circular motion. This is where the 'regulated' word starts to be used.
If the escapement was to be removed from the clock, the weight would start to accelerate down with gravity and the gears and eventually the escapement wheel would spin very fast until the weight hits the ground ,string would spin everywhere and make a mess.
So the escapement is in place to stop that from happening. The escapement rocks or oscillates backwards and forwards, because it is connected to the pendulum via a part called a crutch. This rocking motion of the escapement lets one tooth of the escapement wheel 'tick' past and in turn catches the next tooth (tock) of the escapement wheel. Every tick or tock of the clock lets the weight drop by a fraction of a millimeter. In fact it takes around 2 days for the weight to fall to the ground. With the clocks that you see here, they all have the same gear ratios. There are a number of commonly used ratios to choose from. The most common radio used, I would say, is 60 BPM...so the pendulum rocks 60 times per minute. The duration of the oscillation of the pendulum is determined by its 'length', not its weight (in a perfect world). I say this because its a fair bit more complicated than that. But a pendulum with a length of around a meter has a 1 second oscillation weather it weighs 100 grams or 100 kilograms!
The 1 second oscillation of the pendulum (through the escapement) regulates the fall of the weight, turning the wheels and gears in a regulated manner, which tell us the time until the weight hits the ground and the clock stops...you should wind the clock before the weight hits the ground :)
So there you have it... Weight Driven, Pendulum Regulated.