All mechanisms, whether driven by combustible fuel, electricity, spring power, man power or any other power, consist of an arrangement of component parts which interact with one another in their respective ways.
In their interactions with each other, these component parts transmit power or motive force through the mechanism from the initiating factor (the fuel or power source) to the final objective action of the mechanism.
This transmitting of power that runs through the component parts of the mechanism we will term the “direction of drive”. Some engineers term it the drive-line or the power train.
This direction of drive is the direction of flow of impetus through the component parts of the mechanism, from power input to power output, from initiation to outcome. This direction of drive, or flow of impetus, exists within every working system and mechanism, whether it is a motor car, a clock, our bodily bio-mechanics, the planet’s weather system or any other system or machine, and whether the power be motive force, hydraulics, electrical, convection or any other.
Here are some examples of how a direction of drive operates within a mechanism:
1. In a motor car, the fuel is burnt in the combustion chambers. The expansion of the burning gasses in the combustion chambers drive pistons, which turn a crank shaft, which turns cogs in the gear box, which turn the drive shaft, which drives the axle, which drives the wheels, which turn upon the road and move the car.
2. In a spring powered clock, the spring turns a large drive cog, which in turn drives another cog which drives another, and so on, until the last cog in the drive chain is turned which turns the hands of the clock.
3. In the human body, the brain emits electrical impulses which travel along the nerves to the muscles and cause the muscles to contract, and when they contract they move the bones, and the body walks along.
A direction of drive even exists throughout the mechanism of our own psyche, which is the mechanism of our consciousness, thought, emotions, and behaviour.