BROTHERS AND SISTERS. 123 



had encountered at Dundee in elaborating his hot-air 

 engine . by introducing the heat - regenerator for the 



O i/ O 



steam-engine. The experiments with these regenerating 

 steam-engines, regenerating evaporators, and condensers 

 claimed for years his time and means, without pro- 

 curing for his constructions general introduction into 

 technical practice. On the other hand he succeeded 

 in practically solving a problem on which I had also 

 long worked in Berlin with incomplete success, namely 

 the water-meter question. The patented Siemens- 

 A damson reaction water-meters for many years com- 

 manded the market and brought William good profits. 

 Then they were superseded by the Berlin construction 

 of the stroke or whirlpool meter, which was at once 

 adopted by William himself. 



The excellent progress which the manufacture of 

 telegraphic and other electrical apparatus made in our 

 Berlin factory, and the great recognition which our 

 -constructions on all sides enjoyed, suggested the open- 

 ing of a business connection between William and the 

 firm of Siemens & Halske. He undertook at first to 

 act as an agent for obtaining orders in England, and 

 very cleverly contrived to turn the attention of English 

 technologists to the achievements of the Berlin firm. 

 This was especially furthered by the first Great Exhi- 

 bition, which took place in London in the summer of 

 1851. Siemens & Halske sent specimens in abundance; 

 their exhibits found universal approval and procured for 

 the firm the highest distinction - - the Council medal. 



My brothers Hans and Ferdinand had remained 



