or other oxidant from channel 1 during cell operation the desired cathode to anode connection is thus made by seal 16 through tube 7 and seal 15 sealing and electrical contact with the anode or fuel side of the cell is relatively straightforward since the atmosphere at the contact is a reducing fuel atmosphere however contact at the cathode requires a conductive material that is also stable in a high temperature oxidizing environment silver and silver alloys are examples of materials that can provide the required stability 0028 fig4 of the drawing provides schematic elevational and plan views of an arrangement for a fuel cell stack incorporating a plurality of honeycomb cells interconnected in series as shown in fig3 multiple honeycomb elements 10 are mounted within gas tight enclosure 18 through which air is passed via air inlet 22 and air outlet 24 fuel is delivered to the cell array through fuel inlet 26 and is exhausted via fuel outlet 28 cell elements 10 are separated from the wall of enclosure 18 by spacers 17 which electrically isolate the cells from the wall but allow fuel circulation to exterior anode surfaces of cells 10 the honeycomb cells within enclosure 18 are physically separated from each other by air tube structures 4 but electrically interconnected as in fig3 electrical power is drawn from the stack through positive electrical lead 30 and negative electrical lead 32 these being connected to the cathode of the uppermost cell and the anode of the lowermost cell respectively the mixing of air and fuel at the top and bottom of the stack is prevented by air tube manifold end plates.