an efficiency of 72 per cent. if the blades be equally well shaped in the steam as in the water turbine, and that the clearances be kept small and the steam dry.  Further, as each turbine discharges without check into the next, the residual energy after leaving the blades is not lost as it is in the case of the water turbine, but continues into the next guide blades, and is wholly utilized there.  This gain should be equal to 3 to 5 per cent.

As each turbine of the set is assumed to give 72.5 per cent. efficiency, the total number may be assumed to give the same result, or, in other words, over 72 per cent. of the power derived from using the steam in a perfect engine, without losses due to condensation, clearances, friction, and such like.  A perfect engine working with 90 lb. boiler pressure, and exhausting into the atmosphere, would consume 20.5 lb. of steam per hour for each horse power.  A motor giving 70 per cent. efficiency would, therefore, require 29.29 lb. of steam per horse power per hour.  The best results hitherto attained have been 52 lb. of steam per hour per electrical horse power, as stated above, but it is anticipated that higher results will be attained shortly.  Whether that be so or not, the motor has many advantages to recommend it, and among these is the increased life of the lamps due to the uniform rotation of the dynamo.  At the Phoenix Mills, Newcastle, an installation of 159 Edison-Swan lamps has been running, on an average, eleven hours a day for two years past, yet in that time only 94 lamps have failed, the remaining 65 being in good condition after 6,500 hours’ service.  Now, if the lamps had only lasted 1,000 hours on the average, as is commonly assumed, the renewals would have amounted to double the year’s cost of fuel, as at present consumed.

The present construction of the motor and dynamo is shown in the figures.

[Illustration:  Fig. 1 though 6]

Fig. 2 shows the arrangement of 90 complete turbines, 45 lying on each side of the central steam inlet.  The guide blades, R, are cut on the internal periphery of brass rings, which are afterward cut in halves and held in the top and bottom halves of the cylinder by feathers.  The moving blades, S, are cut on the periphery of brass rings, which are afterward threaded and feathered on to the steel shaft, and retained there by the end rings, which form nuts screwed on to the spindle.  The whole of this spindle with its rings rotate together in bearings, shown in enlarged section, Fig. 3.  Steam entering at the pipe, O, flows all round the spindle and passes along right and left, first through the guide blades, R, by which it is thrown on to the moving blades, S, then back on to the next guide blades, and so on through the whole series on each hand, and escapes by the passages, P, at each end of the cylinder connected to the exhaust pipe at the back of cylinder.  The bearings, Fig. 3, consist of a brass bush, on which is threaded an