SECTIONAL TRANSACTIONS.—G. 435 
with the influence of width on the apparent strength and ductility of test-bars 
cut from 4-inch and $-inch mild steel plates and from }-inch copper plate. The 
width 
range of the ratio iiiaieneke 
Bisthto 32:1: 
In the afternoon visits took place to Messrs. Bruce Peebles & Co., 
Edinburgh (electrical engineering), to Messrs. Ramage & Ferguson, 
Leith (shipbuilding), and to Leith Docks. 
in the thinner plates is approximately from 
Friday, September 9. 
6. Presidential Address by Prof. A. H. Gipson on Water Power. 
See p. 110. 
7. Prof. F. G. Batny.—The Linking up of the Smaller Water-Powers 
in Scotland. 
8. Prof. F. C. Lea.—The Utilisation of Tidal Power, with special 
reference to the Severn Estuary. 
The daily and monthly variation of head in tidal estuaries and the conse- 
quent variation in the energy per day available. The difficulty arising in 
utilising power as developed; the necessity for large storage reservoirs, and 
the consequent increase in plant necessary and loss of efficiency in the system; 
the probable power available in the estuary of the Severn; types of turbines and 
pumps that might be used and the particular turbine for a known output; 
capacity of the storage reservoir necessary to obtain a given daily energy supply ; 
some points to be considered in preparing the scheme. 
In the afternoon a visit took place to the wire mills of Messrs. 
Brunton, Musselburgh. 
Monday, September 12. 
9, Squadron-leader A. J. Mmmzy.—Seaplanes. 
10. Joint Meeting with Section C. Discussion on The Mid- 
Scotland Canal. 
In the afternoon a visit took place to the Laboratories of Heriot- 
Watt College. 
Tuesday, September 13. 
11, Mr. Sypney B. Donxin.—Some Notes on the New Electricity 
Supply Station of the Corporation of Edinburgh for the Supply 
in Bulk to the City and to the Lothians. 
(1) Short historical sketch of the Edinburgh electricity undertaking. 
(2) General description of the new power station in process of construction, 
with special reference to its economic operation, and the efficient use of available 
fuel. (3) Suggested area of supply. (4) Details of some novel features in the 
design, such as the means proposed for obtaining condensing water from the 
sea, the degasification of feed water, scientific boiler-room control, etc. 
12, Report of Committee on Complex Stresses. See p. 291. 
13. Dr. S. P. Smiru.—Large Electric Units. 
Large manufacturing firms in different countries were invited to supply in- 
formation on recent machines used for the production of alternating- and 
continuous-current energy. The abundant supply of information deals with 
prime movers, turbo-, water-wheel, and slow-speed alternators, continuous- 
current generators, rotary and motor converters and rectifiers. A selection was 
