The present invention aims to provide a magnetic sensor provided with a magnetoresistive effect element capable of stably maintaining a direction of magnetization in a magnetic domain of a free layer. The arms have a profile in the form of a downwardly-open longitudinal channel, and the base plate has spaced longitudinal guide rails on which the longitudinal channels slidably engage. The invert mud drill cuttings are agitated within the jet pump to effect transformation of the solids-oil matrix of the invert mud drill cuttings. The buffered data is associated with buffered timing information that lags behind the current timing information associated with the currently transmitted data. At least part of the emitted fluorescence passes through the substrate, and then exits from the other surface of the substrate. Audio feedback is provided when the switch is used to change the ratings of the media files.