- 147 -Third Trial of Plant No. 2. Shambat—continued.

Weir reading ... ... ... ... ... ... inches 9.75 Discharge from pump ... ... ... ... ... gallons per minute 5,960 Discharge from pump ... ... ... ... cubic metres per hour 1,625 Total lift of water ... ... ... ... ... ... feet 12.3 Water Horse-power ... ... ... ... ... ... 22.2 Combined efficiency of engine and pump ... ... per cent. 35 Total fuel fired ... ... ... ... ... ... lb. 4,412 Fuel fired per hour ... ... ... ... ... ... lb. 1,103 Fuel fired per W.H.P. per hour ... ... ... lb. 49.7 Total feed water ... ... ... ... ... ... lb. 11,871 Steam used per hour by feed pumps ... ... ... lb. 63 Steam used per hour by engine... ... ... ... lb. 2,905 Steam used per I.H.P. per hour ... ... ... lb. 45.8 Temperature of feed water ... ... ... ... °F. 100 Water evaporated per lb. fuel as fired ... ... ... lb. 2.63 Equivalent evaporation from and at 212° F. ... ... ... 3.03 Cost per W.H.P. hour ... ... ... millimes 12.5 Cost per 1,000 m³. water delivered ... ... ... millimes 169 It was thought advisable to make a further test with this plant when working at its maximum lift, and this was arranged when the river had fallen to its lowest level. The lift was 30 feet, and although all circumstances were favourable to a successful test, the results were rather disappointing, the combined efficiency of engine and pump only reaching the figure of 39.2 per cent., Assuming a mechanical efficiency of engine of 90 per cent., the efficiency of pumping would be 49.2 per cent., which is not a very high value. This test was carried out in the same manner as the previous one, and it was intended to run for the same length of time, but a joint of the condenser gave way, and the engine had to be stopped a short time before the desired completion of period of test. The engine performance was distinctly better than the previous one, the amount of steam per I.H.P. hour being 30.8 lb. This included all losses other than steam used by feed pump. The performance of boilers was not very good, due to their being heavily steamed, and also to the unskilful firing of the native stokers. The reduction in cost per W.H.P. hour is noteworthy, though the cost per 1,000 m³ water delivered has increased considerably. As this unit has been continuously running for a longer period than any other on the farm, a diagram showing its pumping costs at varying lifts is appended.