SECTIONAL TRANSACTIONS.— G. 361 



(3) Structural Arrangement. — The effect of increase in size and alteration in shape 

 in modifj'ing the conventional Zeppelin arrangement. Alternative methods of 

 distributing weiglits and lifts. The problems arising from the provision of adequate 

 passenger accommodation. 



(4) Structural Detail. — The requirements of rapid erection and easy maintenance 

 and repair. Developments in "girder and joint construction — materials employed, 

 weights and factors of safety. 



(5) Propulsion. — Airship engine requirements and the iise of alternative fuels. 

 The arrangements of engines and propellers. 



(6) Fabric Work. — Gasbag and outer cover requirements. The development of the 

 metal cover. 



(7) Passenger Accommodation. — The various possible alternative arrangements, 

 the scale of luxury and the weight involved. 



(8) Handling and Mooring. — The mechanisation of the handling of airships and 

 its influence on their design. 



Mr. B. N. Wallis. — The Design and Construction of H.M.A. RIOO. 



Herr Direktor W. E. Doerr. — The Airship ' Graf Zeppelin.' 



Discussion. 



Afternoon. 



A series of cinema films of the Airships RIOO, RlOl and ' Graf Zeppelin,' 

 shown in the Great Hall of the Merchant Venturers' Technical College. 



Tuesday, September 9. 



The Economical Production of Power: — 



Mr. G. A. Orrok. — The Use of High Steam Pressures and Temperatures in 

 the Generation of Power. 



A brief historical note indicates the line of development towards increased steam 

 pressures and temperatures in power generation. Both pressures and temperatures 

 in general use increased only slowly until fifteen-twenty j'ears ago, but since then 

 the rate of development has rapidly increased. 



The increase in operating efficiency due to the use of higher pressures and 

 temperatures is considered in detail. Certain assumptions are made as to the losses 

 which may be expected in a central station, and curves are drawn to show the 

 maximum economy (in B.T.U.'s per K.W.H.) to be expected under any given con- 

 ditions of pressure and temperature. Consideration is then given to the effect of 

 variation of load factor. An empirical formula is suggested as an indication of the 

 maximum possible station economy, taking into account variation in pressure, 

 temperature, and load factor. This formula is used to obtain a family of curves, 

 showing, for a given initial steam temperature, the maximum economy for any 

 combination of pressure and load factor. Comparisons are made between the curves 

 thus obtained and the actual operating results from a large number of central stations. 



In conclusion, an estimate is made of the increase in economy to be expected from : 

 (1) increased load factor, (2) increased steam pressure, (3) increased steam temperature, 

 and (4) improved conditions of operation. 



An appendix gives the main particulars of the high-pressure power stations of 

 America. 



Sir Henry Fowler, K.B.E. — The Question of Fuel Consumption in 

 Locomotive Practice. 



Difficulties peculiar to steam locomotives. Effect of varying work. Steps taken 

 to deal with this. Methods adopted in design and operation to conserve fuel and to 

 ensure economy in running. 



