124 THE ADDRESSES, LECTURES, ETC., OF 



a useful instrument for warning mariners of the approach of 

 danger, and for determining their position on seas, the soundings 

 of which are known. 



Another variety of this instrument is the horizontal attraction 

 meter, by which it will be possible to obtain continuous records of 

 the diurnal changes in the attraction of the sun and moon as 

 influencing the tides. This instrument belongs, however, rather 

 to the domain of physics than to that of mechanical science. 



These general remarks upon the subject of measurement may 

 suffice to call your attention to its importance, several branches 

 of which, those of Linear, Cubical, and Electrical Measurement, 

 will now be dealt with. 



The discussions which will follow these addresses will be carried 

 on under circumstances such as have never before co-operated, 

 namely, the presence of leading men of science of all civilised 

 nations, who will take part in them, and the easy reference which 

 can be had to the most comprehensive collection of models of 

 scientific apparatus both modem and ancient which has ever 

 been brought together. 



ADDRESS 

 Of C. WILLIAM SIEMENS,* D.C.L., F.R.S., 



The President of the Iron and Steel Institute, delivered 

 on the 20th March, 1877. 



THE Iron and Steel Institute was called into existence in 1869 

 by a few of those leading members, who, assisted throughout by 

 our energetic General Secretary, are still giving it their zealous 

 and disinterested support. At their head stood his Grace the 

 Duke of Devonshire, who, as its first President, pointed out to the 

 young Society the useful results that would be realized through a 



* Excerpt Journal of the Iron and Steel Institute, 1877, pp. 6-34. 



