Early scientific instruments are typically made of latten, a quaternary copper alloy (Cu, Zn, Sn, Pb) with many trace elements. The crystallographic structure depends on the metalworking techniques used in their manufacture.Ongoing research into the history and development of the instruments requires profiles of the elements.(to be established in a parallel negative muon proposal) and information on the crystallography. This proposal is to extend existing neutron diffraction techniques to this different material to provide structurel information on three selected archaeological specimens being profiled in the muon experiment, This will both extend the proven capability of the technique and give a more complete description of the specimens and their history.