408 CARBONIZING TURF. 
[have at present, four furnaces or kilns, at work ; 
they are constructed between two rails, on which 
I have built a moveable frame, with a roof covered 
with a tarpauling. This skeleton of a house 
answers two purposes, namely, it enables the men 
to fill and empty the kilns in all kinds of weather, 
and affords to the whole line the use of the double 
purchase to wind up the heavy iron covers. 
The white turf gives a fourth of its weight of 
charcoal, the brown a third, and the black one- 
half. 
The nature of charcoal from peat, is a great 
deal less pyrophoric than that of wood charcoal ; 
and during the four years that I have had always 
large quantities in the interior of my works, I 
have not had a single instance of a spontaneous 
ignition, whilst I had two accidents of this nature, 
with wood charcoal, in the short space of six 
weeks. 
