Miscellaneous. 520 
interest which is taken in the desire to ascertain the fate of 
my valued friend, I may say that I have received more than 
twenty applications from competent men to serve as volun- 
teers in the the ‘Livingston Search Expedition.” It will 
be a source of comfort to the numerous admirers of the 
intrepid Livingstone, that Sir Roderick Murchison, believing 
the fate of his friend is open to some doubt, announces that 
an expedition will be sent out in search of him, or of what 
traces may be left of him, supposing that the account of 
his death is authentic. An iron boat will be carried in 
pieces to a point above the cataracts of Shiré. From this 
point the Lake Nyassa will be navigated to its northern 
end, near which the disaster is said to have occurred. 
THE UTILIZATION OF HEAT.—Mr. C. W. Siemens, the 
eminent electrician, devised, some time since, a furnace, 
which he called the “Regenerator Gas Furnace,” by the 
use of which a great saving in fuel, nearly 50 per cent., is 
attained, together with the advantage, that the nuisance 
arising from smoke is obviated. To form an idea of the 
enormous economy of this furnace, let us suppose that it 
takes 3,000 degrees to heat steel to the welding point. 
When the steel is put cold into a furnace, which gives 
4,000 degrees of heat, the cold air supplying the furnace 
takes up 3,000 degrees before the steel reaches the welding 
point, the 1,000 degrees of excess of temperature are alone 
used to furnish the steel with the necessary heat, the re- 
maining 3,000 degrees escaping by the flue. In Mr. 
Siemen’s invention, the heated air is returned through a 
reservoir of open-spaced bricks, so that nearly the whole 
heat power generated in the furnace is available in welding, 
in place of about half obtained from the furnace in common 
use. The fuel for this furnace is supplied in the form of 
gas produced at a distance from the furnace, a considerable 
advantage in glass factories, since, in the manufacture of 
such delicate ware, it is desirable to avoid the dirt of the 
ordinary furnace. The important points in favour of this 
furnace, besides its economy, are the purity of its flame 
and the intensity of its heat, great advantages in the opera- 
tions spoken of, both in improving the quality of the goods 
produced, and preventing unnecessary waste. 
