Abstract: Embodiments of the present invention are directed to a sample compartment sub-assembly for a spectrometer. The sub-assembly includes a sample support adapted to support one or more sample holders for use in the sample compartment. The sample support is associated with one or more magnets. The sub-assembly further includes a sensor assembly configured to detect the one or more magnets associated with the sample support so as to identify a mode of operating the spectrometer corresponding to the sample support.

Abstract: The present invention provides an engine cooling method and apparatus. The engine cooling apparatus includes a cylinder block having a cylinder head mounted thereto. The cylinder block defines an inlet passage and a block jacket in fluid communication with the inlet passage. The cylinder head defines a lower cylinder head jacket in fluid communication with the block jacket, and an upper cylinder head jacket in fluid communication with the lower cylinder head jacket. The lower cylinder head jacket includes a plurality of nozzles configured to direct engine coolant and thereby provide cooling to portions of the cylinder head located near a plurality of exhaust ports, a plurality of injector ports, and a plurality of intake ports.