SECTIONAL TRANSACTIONS. — G, H. 365 



approximately correct. Arising from a desire to study 

 jet conditions, the necessity of dealing with any type of 

 expansion is postulated, and some discussion is given on the 

 general influences of certain arbitrary laws of expansion on 

 throat and flow conditions. 



Excursion. 

 In the aft-ernoon a visit took place to the Dowlais (Cardiff) 

 works of Messrs. Guest, Keen & Nettlefolds, Ltd., at East Moors. 



Friday, August 27. 



12. Prof. W. Ce.^mp. — The Pneuviatic Conveying of 



Materials. 



13. Wing-Commander T. E. Oave-Browne-Oave. — Airships 



for Slow-speed Heavy Transport and their Application 



to Civil Engineering . 



The use of airships as a means of transporting considerable 

 loads over impassable country is developed from the opera- 

 tions actually carried out up to the present. The application 

 to Civil Engineering, Surveying, and Transport is discussed, 

 and a review is made of the uses of airships for purposes 

 other than those of the Mail and First-class Passenger 

 Services, which have been fully dealt with by Air Commodore 

 Maitland before the Royal Society of Arts. 



14. Prof. G. W. O. Howe. — The Efficiency of Transmitting 



Aerials and the Porver required for long>-distance Radio- 

 Telegraphy. 



15. Di'- J- S. Owens. — The Removal of Reefs in the Rio 



Guadiana. 



This paper describes the removal by drilling and blasting 

 of about ll,O0O tons of rock reefs from the bed of the Rio 

 Guadiana at Pomaron, the port of the San Domingos Mines. 

 There is at this point a rise of tide of 11 ft. springs, 

 maximum normal cunent up to about three knots, and a 

 maximum depth over the reefs of 30 ft. Drilling was done 

 from a floating drill barge using a 5-in. steam drill. Charging 

 was done without divers and by means of specially prepared 

 ' sausages ' of dynamite dropped through a pipe and fired 

 electrically in groups of about eight holes. 



Excursion. 

 In the afternoon a visit took place to the surface plant of the 

 Great Western Colliery Co., near Pontypridd, including large 

 electric winder. 



SECTION H.— ANTHROPOLOGY. 



(For references to the publication elsewhere of communications entered in 

 the following list of transactions, see p. 381.) 



Tuesday, August 24. 



1. Presidential Address, by Prof. Karl Pearson, F.E.S. 

 (See p. 135.) 



