Operation of the GOWMAC Series 350 Gas Chromatograph 1. Turn on the chart recorder. Turn the 'DET POWER' switch to the on position, and turn the 'CURRENT' knob fully clockwise. The remainder of the setup will have been done by the lab staff. Turn the 'ATTENUATOR' knob on the gc to '4', and use the 'ZERO' knob on the chart. The Department of Natural Sciences at Shawnee State University operates a Bruker Fourier 300 MHz NMR Spectrometer for use in its undergraduate teaching labs, as well as for research. The spectrometer was installed in the spring of 2012 and is housed in Massie Hall, room 019.