Abstract: Interferograms produced by a Michelson type interferometer used in Fourier Transform spectroscopy are processed by an arrangement which includes an analogue-to-digital converter (12) which is sampled by a fixed frequency clock signal to provide a digital representation of the interferogram. This signal is processed by a digital data processor (18) which also receives a digital representation of the reference fringe waveform to provide a digital output representing the interferogram. The digital representation of the reference fringe waveform may be produced by a second analogue-to-digital converter or by a timer. The analogue-to-digital converter may be arranged to produce oversampled representations of the interferogram or reference fringe waveforms. In one form of the invention the analogue-to-digital converter or converters include a delta sigma modulator.

Abstract: A lubrication nozzle has a body with a piston cavity formed therein. One end of the cavity is closed by an adjusting cap attached to a spring biased piston. The opposite end of the piston cavity has an orifice closed by a conical tip on the piston. Lubricating fluid and compressed air are supplied to separate ports in the body. The compressed air actuates the piston to open the orifice and permit the lubricating fluid to flow through a nozzle cap to an area to be lubricated. The tip and the seals on the piston are formed of an elastomeric material and easily can be replaced by removing the adjusting cap.