| 500x333 | 115K | jpg free download |
| 119x79 | 23K | jpg free download |
| 300x200 | 55K | jpg free download |
| 1024x683 | 416K | jpg free download |
| 1600x1067 | 963K | jpg free download |
Macro close-up of some cogs and bits of machinery; the thing on the left is a sort of spring-loaded clutch (not from a car, though!). As the wheel turns the spring gradually coils, until eventually the other end starts to turn, and then they turn together. The idea seems to be to provide a sort of cushion for stopping and starting.
| 500x333 | 115K | jpg free download |
| 119x79 | 23K | jpg free download |
| 300x200 | 55K | jpg free download |
| 1024x683 | 416K | jpg free download |
| 1600x1067 | 963K | jpg free download |