pin 474 rests on the central land 202 of the bracket 200 it has a central projection 490 which passes through the central opening 210 internally threaded blind bores 492 are provided on the underside of the flange 488 screws passing through the openings 212 secure the bearing pin 474 to the land 202 it will be appreciated that as the bracket comprise metal it will serve as a heat sink for the bearing pin 474 and also will remain rigid during normal and excessive heating of this part it will be appreciated that when mounted on the wheel the axis 416 of pendulum arrangement will be horizontal it will be seen therefore that as the wheel 300 and with each of them the wcdsd 10 rotates about a horizontal axis the pendulum 402 carrying the heavy counterweight 404 will remain substantially stationary thus the end faces 194 of the coils 182 and 184 will pass by the magnets 448 which will induce an electrical current into the coils 182 and 184 such electrical current will serve to provide power for the pcb and the programmable integrated circuit incorporating the transmitter carried thereby it will be noted that when any magnet is.