effects of the system are indicated by an anemome- 
ter connected with a contrivance of Mr. Van 
Hecke’s. He then adds : — 
“ In order to complete the description of this 
system of warming and ventilating, I have to 
notice an apparatus not yet fixed, but which is 
now been constructed by Mr. Van Hecke, and to 
be placed within the stone built channel, which 
from the cellar leads into the garden for air. 
This apparatus is intended to cool the air in 
summer, on its way to the wards. It consists 
of two cylinder placed horizontally one above the 
other, at 1 m. 50 s. (4 feet 11^ inches^ apart 
on the axis of the upper cylinder is a pulley to 
receive the movement of the axle-tree. The under 
cylinder is plunged into a trough of water, which 
may be obtained of the the temperature of well 
water, or be cooled artificially by pieces of ice, 
should it be requisite. Endless bands pass 
from one to the other of these cylinders, which 
revolve simultaneously. The air circulating in the 
channel is forced to pass over the constantly 
moist bands and thus acquires a much lower 
temperature. 
“ The use of steam power, we may add, is only 
requisite to Yan Hecke’ s system on a large scale. 
In ships and elsewhere, where manual labour 
can be easily or economically applied, or is suf- 
ficient for the purpose in view, no steam power 
is necessary to ventilation on this plan ; and in 
dwelling houses the ventilator has even been put 
in action by clockwork and weights.” 
After experiments incontestable proved the 
superiority of this system of ventilation by 
pulsion. 
\ 
W. C. BELBRRIDGE, PRINTER, BRISBANE. 
