194 THE BEST ARRANGEMENT FOR COMBINED ENGINES. 
great curtailment in the theoretical gain due to the expansion; on the other 
hand by turning the steam over to the turbines at a pressure and temperature 
that insures a more economical continuation of efficiency in the power 
developed, we thereby succeed in obtaining the very best possible out of 
each type of engine. 
All this, of course, has been considered by the able engineers who have 
designed the important installations of combined reciprocating and turbine 
engines that have been fitted to equally important additions made lately 
to the great steamships of the world. ‘The writer thinks, however, that the 
desire to hold on to the advantage claimed for the twin screw ship in 
maneuvering and the ability to continue a voyage with one engine disabled, 
may have had much to do with determining the arrangement of these great 
combinations of reciprocating and turbine engines. The installation on 
the Olympic, for instance, can hardly be called a combination of reciprocat- 
ing and turbine engines, but rather a splendid example of reciprocating 
engine practice with a turbine in the exhaust to utilize the last stage of 
expansion which the low pressure cylinder could not manage with any 
efficiency. 
In the arrangement proposed in this paper, there is no sacrifice of go 
ahead power with either the reciprocating engine or the turbines disabled, 
but only a sacrifice of backing power should the reciprocating engine be out 
of commission. ‘The question is one that ought to form a good subject for 
discussion by this Society. 
THE PRESIDENT — Yesterday afternoon the paper entitled, “‘ The Best Arrange- 
ment for Combined Reciprocating and Turbine Engines on Steamships,” by Mr. 
George W. Dickie, Member of Council, was read by title. We will now take up at 
this time the paper entitled ““The Parsons Marine Steam Turbine and its Applica- 
tion to Various Classes of Vessels,”’ by Mr. E.H.B. Anderson, Member. These two 
papers will be discussed together. I will ask Mr. Anderson to present his paper. 
Mr. E. H. B. ANDERSoN:—Mr. President and Gentlemen, the object of this 
paper is to put before the Members of this Society some of the various arrangements 
of Parsons Turbines, both in the present vessels and in those built in the past. I 
will not go over the paper in detail, for the reason it would probably take up too 
much time, and I think you all have copies of the paper. 
One of the main points I want to bring out is, that in the Parsons Turbine 
there is no one standard type of arrangement, but that Sir Charles Parsons himself 
has invented special features in his machinery designs which are arranged to suit 
the requirements of each type of vessel. 
Mr. Anderson then presented the paper. 
