ON THE CONSTRUCTION AND HEATING OF HOT-HOUSES. 
249 
the coal, while the heated air, passing- through the coke fire, and under a eounter 
arch, sweeps over the fresh coal, and inflames all the gas as it is evolved. 
Thus it is that the carbon, carburetted hydrogen, oleiiant, and all other com- 
bustible gases from coal, are employed in producing heat without smoke (figure 4), 
while no residuum of a combustible nature is left unburnt. 
In addition to this, Messrs. Chanter and Co. have invented a new patent boiler (5), 
not occupying more than half the usual space, with greater surface applicable to hot 
water apparatus of every description ; by means of which, if united with the gas 
furnace, the same temperature is said to be retained tivelve hours without attending 
to the fire, or any inconvenience arising from smoke or dust . 
In combining the patent furnace with the hot water apparatus, a small additional 
charge is made for the patent. The apparatus can be introduced in various forms 
and designs, by large or small pipes, within ornamental figures, or any way the 
proprietor of the house pleases. 
When the furnace is required to a boiler or to flues in use, very little expense or 
delay will be occasioned to fix it, as it requires no alteration in the flues, nor need 
the boiler be disturbed. Plans, designs, and further information may be obtained at 
the patentee's offices, St. Ann's Wharf, Earl-street, Blackfriars, London. 
On heating by hot water we have previously inserted much information ; we have 
here, however, added an extract from a paper on that subject, with illustrative 
figures, by Alexander Cruikshanks, Esq., read before the Horticultural Society, 
May 20, 1834, and inserted in their Transactions, vol. 1, page 513, N. S. 
The writer suggested the mode of heating the water to a friend in France, who 
had built a small greenhouse in front of his dining-room, where there was no con- 
venient place to erect the brickwork for a common boiler, nor any chimney into 
which a flue might be turned. It occurred to him that by having a small cylinder 
boiler constructed like those originally employed in the high pressure steam-engine, 
containing the furnace in a smaller cylinder within the first, and surrounded by the 
water, that no brickwork would be required ; and that by burning a mixture of 
VOL. II. NO. XXIU. K K 
