Gordon Battery
is similar in operation to the Edison-Lalande, but differs in details of construction. The zinc is a heavy ring suspended outside, but not touching a perforated tin cylinder closed at the bottom, containing the oxide of copper in flakes. Its internal resistance is slightly higher than the Edison-Lalande cell, otherwise there is little choice. The 6 × 8 size is excellent for coil work, giving 250 actual ampere hours and remaining on open circuit for long periods without deterioration.