[Oct. [, 
SIO Improved, Mode of Warming Rooms. 
jVJr.Whitmore, M.P.; the ann of Sir James 
Bontein; the son of Mr. Smith, M.P. for 
Norwich; Sir-Twisden, hart. ; the 
three sons of Capt. Millet, the East India 
director; the son of the late Col. Men- 
ron, of Madras; Messrs. Lawson, Arbuth- 
isot, Roberts, &c. L. L. 
To the Tdilor of the Monthly Magazine. 
SIR, 
OME weeks ago, Mr. Slater, of 
Birmingham, being engaged at the 
house of one of my friends, in hxing his 
patent steam-apparatus for cooking, he 
very kinciy shewed and explained to me 
the construction of it. I w’as particularly 
pleased w'ith the complete manner in 
which, by the same instrument, the roast¬ 
ing, baking', and broiling, were executed ; 
and it occurred to me, that, without much 
difficulty, by the similar means of hot-air 
pipes, all our lodging rooms might be 
warmed from the fires in the rooms be¬ 
neath. My plan was this—The hot-air- 
pipe, forming a back to the parlour grate, 
could have a tube made of tin of 11 inch 
diameter, inserted into it, and extend up 
the chimney to the third, that is, highest, 
story, with a slide both in that and the 
second story, to admit the warm air at 
pleasure. For the hot air-pipe, Mr. 
Slater would, in this instance, substitute 
an iron-box, or more properly retort, of 
about a brick breadth in thickness; into 
wliich the cold air might be conveyed 
from the outside of the building, through 
a pipe about ten feet in length, and three 
inches diameter. The air, as soon as 
' heated from the fire, contained in the 
grate, w’ould ascend through the tin pipe 
into the chambers^ and by this means 
iuppiv them with a constant circulation 
of pure warm air, far preferable to the 
unwholesome effluvia from a coal-fire, 
which is so sensibly felt by persons of 
weak lungs. 
The heat would also be more regular ; 
every expense of fuel, brashes, &c. for 
cleansing the grate and the furniture, 
(which often sutlers materially) besides 
she first cost of the grate, and ail the 
trouble of the servants wotdd be duns 
away. 
Allow me to mention a circumstance 
not altogether foreign to my subject: 
—Some years since, Mr. S. O. a ma¬ 
nufacturer in Stockport, conducted my 
tistiie? through his extensive buildings. 
L na§ winter, but, as soon as he entered^ 
he was requested to take off his great 
coat; the room felt comfortably warm, 
but there Was no appearance of fire, or 
fire-place; in every room as they as¬ 
cended the h.eat increased. An expla¬ 
nation being requested, Mr. O. pointed 
out a fire upon the ground-floor, the 
smoke of which was conveyed by on iron 
tube, through a chimney of biick, well 
plastered and closed at the top: the 
air entering the chimney was warmed by 
the surface of the tube, and admitted by 
small slides into each apartment, as re¬ 
quired. A neat small arch turned over 
the grate formed a kind of funnel, at the 
end of the pipe. 
It is a fact well known, that in every 
fire-place a much greater proportion of 
heat is carried up the chimney combined 
with the smoke, &c. than is thrown into 
the room; on this account perhaps the 
latter method claims the advantage. It 
however answered very well, and was 
proposed as peculiarly applicable at the 
building of the school for the blind in 
Li verpool; but the fear of the experiment 
not answering in a public institution, 
pi’evented the architect making the at* 
tempt. 5l. H. 
Liverpooly Dec. 1810. 
To the Editor of the Monthly Magazine,. 
SIR, 
CORRESPONDENT in your Ma¬ 
gazine for July, who signs himself 
A Constant Reader, desires a reference 
to any book that has treated on the pres¬ 
sing of seamen to serve in our navy. In 
compliance with his desire, I am induced 
to recommend to his perusal, the senti¬ 
ments of Mrs, Hanway upon that in¬ 
teresting subject; wliich he will fin'd 
strongly delineated in her novel of Andrew 
Stewart, or the Northern Wanderer, 
vol. 1, page 28. Veritas. 
Richmond, August 0,7, 1811. 
To the Editor of the Monthly Magazine^ 
SIR, 
S you may possibly put ttie public 
into early possession,, through th« 
medium of yojur valuable Journal, of all 
the important information connected with 
the census lately taken of Great Britain, 
it struck me that it might be pleasing to 
some of your readers to be able to com¬ 
pare the relative population of the larger 
cities and towns of Trance, with that of 
