12 
PLAN OF A PINE PIT WITHOUT FIRE. 
a Dung pit four feet deep and 
two feet six and a half wideinside. 
b Air Chamber to receive the 
steam from the Dung in the pit 
c Pigeon holed walls to admit 
the steam into the air Chamber 
(1) brick set edgeways (2) hollow 
cavity (3) bricks laid flat. 
d Pit filled with spent bark in 
which the pots are plunged, twenty 
two feet three inches long and 
seven feet nine inches wide out 
side of the walls, covered \vith 
seven lights each made to slide. 
e Out side w r alls which may be 
built of either stone or brick. 
/Front view of the vvall against 
which the hot dung is placed, the 
hollow spaces are to admit the 
steam of the dung into the cham¬ 
ber. b 
g Pipes of wood to admit the 
hot air into the upper part of the 
frame when necessary, with stop¬ 
pers to prevent it at pleasure, on 
Mr. Knight’s system. 
h Wooden covers to keep the 
dung from being affected by the 
wetness or coldness of the weath¬ 
er. 
i Drain to carry off the super¬ 
fluous moist are from the manure. 
j Ground level. 
f 
f 
