| 摘要 |
<p>The head (1) receives high pressure water (8) which is fed to nozzles (9) producing forward movement. A camera (3) takes pictures through a port (4) using light emitting diodes (5) and transmits signals along the water supply pipe sheath. The head position is determined from an electromagnetic emitter (10). If the water pressure is increased a valve (7) opens to supply a jet to clean the camera port (61) and a jet to remove obstructions ahead.</p> |
