BEES UNDER PROPER CONTROL. 
5 
which stands opposite the latter), and now passes 
through the grating [g) and the smouldering fuel, and 
escapes by the nozzle. It has been urged that the smoke 
so ejected is objectionably hot^ and hence the Clark 
“Cold Draught’^ (B). Here the bellows boards are 
kept asunder by an external spring {sp). As the 
bellows are flattened by the hand, the air escapes 
Fig. 3.— a, Bingham Smoker. B, Clark’s Cold Draught Smoker 
(Sectional Vie\v, one-fifth actual size). 
b. Bellows; v. Valve ; sp, Spring; fb, Fire-box ; d, Door to Fire-box ; g. Grating ; 
n, Nozzle ; bp, Blast-pipe. 
by the blast-pipe [bp), not to pass through the 
fuel, but to escape at once by the nozzle. It is, 
however, true that every air current by liquid friction 
draws other quantities of air into its wake, and so 
the smoke discharged from the fuel, and filling the 
nozzle, is sent forward with the blast. It is con- 
