NMR Question

[MathNerd]

I know that a Nuclear Magnetic Resonance (NMR) machine consists of a magnet, radio transmitter, detector and a sample material. By using a NMR machine how are the spins of the nuclei in the sample material observed? The more detail the better.

Thanks in advance.

[Baggio]

Hey I'm actually working on a 2nd year undergrad experiment in NMR and came across
http://www.cis.rit.edu/htbooks/nmr/


you may find it helpful