HEATING HOTHOUSES. 
385 
ARTICLE IV.—A FURTHER EXPERIMENT ON HEATING HOT¬ 
HOUSES WITH HOT-WATER. 
BY MR. SAUL, SULYARD-STREET, LANCASTER. 
In page 136, of your Magazine of Botany, you have given a plate 
of my hot-water apparatus, and you state that you will resume the 
subject shortly. Having made another experiment by removing the 
two pipes (8, 8,) as shown in the Horticultural Register Vol. I, 
page 586, and fixed one pipe eighteen inches long, and four and a 
half inches diameter, inside measure, see fig. 26 (6). I enlarged the 
fire place (a) and made the grate flat, as ( e ), and to my great as¬ 
tonishment, I was never able to obtain one half the heat, although 
I had increased the size of my fire-place so much. 
26 
It is therefore, quite clear, that small tubes or pipes placed in the 
same way, as in Vol 1, page 586, and page 136 of your Magazine of 
Botany, are far better than one larger pipe, as fig. 26 ( b ). Also 
it is a great advantage for the grate ( b ), to be on an inclined plane, 
and not level as (c). 
Conscious of this, I have removed the pipe (6), and replaced the 
two pipes, also the inclined plane, and by this means, l am able to 
obtain the heat you named in my former papers on the subject. It 
is by small tubes, that the engines on the railways, obtain their great 
heat, and I believe that small pipes will answer better than large 
boilers for heating hot-houses, because of the little time required to 
procure the heat. 
