202 
GREENHOUSE CONSTRUCTION AND HEATING. 
Fig. 140. 
are those made by Messrs. C. 
Toope and Sons, of Stepney. The 
(patent) system on which all their - 
heating apparatus are constructed 
will be understood at once by a 
glance at the accompanying- 
illustration (Fig. 1389) of their 
‘‘Champion” heater. | These 
heaters are constructed in various 
styles and sizes, but in spite of 
the simplicity of construction of 
the boilers they absorb the heat 
from the burner so completely 
that as a rule the flue-pipe is 
considerably cooler, at a few feet 
from the boiler, than the hot- 
water pipes. Fig. 140 shows 
Toope’s ‘‘ Princess” Heater, 
which from experience I can 
strongly recommend. 
The ‘‘ Radiator ’’ oil-stoves have 
already been described and illus- 
trated on pp. 149-150. 
Flues.—The ordinary smoke- 
flue, which formed the chief 
dependence for heating glass. 
structures of all kinds previous. 
to the introduction of heating 
by hot water, consists of a. 
furnace constructed as shown in 
Fig. 141, built into the wall of 
