— IGi — The price of crude oil delivered at the pumping station being £E.8 per ton, or 3-57 milliemes per lb., the cost per W.H.P. per hour noted on the makers' test figures would be 2'85 milliemes, or a reduotiofi of 61 per cent, on the actual working figures.

On May 14th, 1914, a further trial was made to determine the consumption when paraffin fuel was used. The test was held under the same conditions as the previous case, with the exception of the lift which was slightly less.

Second Trial of Plant No. 3. Tiiti Island.

Date Duration of trial ...

Kind of fuel used Total fuel consumed Fuel consumed per hour . ., Eevolutions of engine Revolutions of pump Average weir reading Discharge of pump Discharge of pump Total lift of water Water Horse-power Fuel consumed per W.H.P. per hour Cost per W.H.P. per hour Cost per 1,000'm" water delivered As was to be expected, the cost of pumping on paraffin was greatly in excess of that when using crude oil, the relative costs of the fuels dehvered on site being £E.16 and £E.8 per ton respectively.

The saving effected by the use of crude oil should have been 50 per cent., but was in reality 54 per cent. This discrepancy was due to the decrease in engine efiiciency since the earlier test, caused by reasons which have previously been stated.

The makers' test figure for paraffin fuel was '617 lb. per W.H.P. per hour as against the actual working test performance of 2-42 lb.,,or four times their estimate.

May 14th, 1914