GENERAL REMARKS ON HEATING. 151 
on the whole steady and regular in action, nearly or quite 
innocuous, economical as regards fuel, and of considerable 
use for the purpose in view. They are, however, decidedly 
inferior, for the growth of choice or delicate plants, to a 
proper set of hot water pipes. Illustrations of some of the 
leading forms will be found a little farther on. 
There is also a class of apparatus consisting of a few 
feet of hot water piping, usually of small diameter, heated 
by a small copper or other boiler, constructed to consume 
NEW PATENT 
f§ RADIATING 
FIG. 98. 
gas or oil (paraffin) as fuel. These are admirably adapted 
for heating small conservatories and plant-houses, where 
only a moderate temperature is required, and as a flue 
(pipe) is usually provided to convey the products of 
combustion outside the house this class of apparatus is 
entirely innocuous. The flame (which takes the place of 
a fire) can be regulated to a nicety, and being constant 
and regular, there are no fluctuations of temperature ; 
where gas is employed an atmospheric burner must be 
