THE GARDENING WORLD 
649 
October 5, 1907. 
R flew Conservatory Boiler. 
Some davs ago Mr. C. R. Stevens, in¬ 
ventor and patentee, brought to our office 
a sample of a new boiler heated by gas, 
paraffin oil, or spirit burners, and suitable 
for heating greenhouses and conserva¬ 
tories. This was put in working order, 
filled with water and heated with gas upon 
the building. In a very short time the 
flow pipes began to heat, and soon after 
the return pipes became heated too, giv¬ 
ing a good illustration of how quickly and 
easily water may be heated to raise the 
temperature, maintain it, and keep out 
frost from such buildings. 
This invention entirely gets over all the 
trouble and difficulty that has been made 
in the use of small boilers in the lighting 
of the burners and sooting of the flue. 
These boilers are made with an opening 
in the front into the flue, fitted with a door 
or shutter which can be opened for light¬ 
ing and regulating the burner and for 
cleaning out the flue. These boilers, 
heated by gas, oil, or spirit burners, can 
be fitted with coils of hot-water pipes, as 
shown in the engravings (here reproduced) 
at the sides or on one side, or fitted with 
circulating pipes for hot-houses. They 
are also made with several flues to one 
boiler, for heating large hot-houses. The 
one shown in the engraving with coils of 
pipes on both sides is made for warming 
conservatories and greenhouses, in sheet- 
steel galvanised. All parts inside of flue to 
boiler are brazed together. Galvanised 
ones can be japanned to any colour re¬ 
quired. 
The apparatus, No. 1 size, is 2 ft. 4 in. 
long, 2 ft. high, and 8 in. wide, with 
24 sq. ft. of radiating surface (larger sizes 
made to order) when heated with one 
Brav’s gas burner. The cost of gas is 
about 2d. to 3d. per twelve hours (price 
of gas in London). 
boiler; 7, two oblong ends with water 
space. The gas burner is inside the bot¬ 
tom of the flue, and the outlet is at the 
top of the flue at the back of the boiler. 
Engraving No. 2 shows the boiler fitted 
with circulating pipes for greenhouses, 
etc. These boilers are supplied with in¬ 
let and outlet, for round or oblong pipes, 
or fitted with one or more rows of oblong 
few inches of the bottom. The outlet is 
fixed on the top of the casing, and the pipe 
rises a few inches higher than the inlet 
pipe. A door is made in the casing for 
lighting the burner. The flue pipe of the 
boiler escapes into the casing by this 
arrangement; no wind can effect the gas 
burner. 
When the boiler is fixed inside of the 
house, instead of the small holes around 
the stand of the boiler it is fitted with a 
pipe which passes through a hole in the 
side of the house to supply air to the 
burner. The flue pipe also passes through 
a hole to the outside of the house; there¬ 
No. 1. New boiler, with -pi-ping complete. 
Description of Engraving No. i. 
1. The boiler is D-shaped, with water 
space round the two sides and back. It 
is made with several cross tubes inside the 
flue; 2 shows the door open; 3 oblong 
circulating pipes; 4 shows the cross tubes 
in the flue of boiler ; 5 shows gas tap, with 
weight for turning off gas when the boiler 
gets short of water, worked by a float in¬ 
side top of boiler; 6, opening for filling 
pipes, 6 ft., 9 ft., or 12 ft. long, with one, 
two, or more flues, fitted with two, four, 
or more burners. 
To protect the boiler when fixed outside 
of the house and prevent the wind blow¬ 
ing out the burner, a galvanised-iron cas¬ 
ing is fixed over the boiler, provided with 
the inlet coming from a tube fixed 
through the top of the casing to within a 
fore, after lighting the burner the door of 
the boiler is closed so that no fresh air 
is used, and no foul air escapes into the 
house. This also prevents any down¬ 
draught or wind blowing out the gas 
burner. When fitted with paraffin bur¬ 
ners they will not require the air to be 
brought inside with a pipe and the outlet 
for the particles of combustion can be 
