Preliminary work has been carried out using the Sheffield mark II real
time Err system, looking for changes in conductivity which occur in t
he stomach and oesophagus following a swallow of a small volume of eit
her a conducting or a non-conducting liquid. This has been done using
three different configurations: a conventional transverse array placed
around the thorax, a rosette array on the abdomen, and a rosette arra
y placed on the back. Results show a significant difference between th
e two liquids, which can be detected equally well by the three electro
de configurations.