Answers to Qjierzes, and Queries. 37 '§ 



material ; and if the latter, where it is to be obtained, and its relative price, 

 as compared with the iron pipes furnished by Messrs. Bailey; and, in either 

 case, the diameter of the pipes used by him ; also, if a reservoir be necessary; 

 he will oblige many of your readers, besides your humble servant — J. M. 

 Brighton, Nov. 16. 1827. 



The pipes at Bickley are common earthen pipes. We have seen pipes, 

 which we should think would answer extremely well in many cases, at the 

 wharf of Messrs. Grieve, Grellier, and Morgan, Waterloo Bridge. They 

 are made in Wales, of fire clay, in lengths of 2 ft. each, and of the following 

 diameters and prices: — 6 in. in diameter, 5s. 6d. per pipe; 4 in., 2s. 6d.' s 

 2 in., Is. 9d. Thej' are used for conveying water, and, when joined by Roman 

 cement, are said to be perfectly watertight. They are greatly superior to 

 the pipes at Bickley, from the circumstance of being so easily joined to- 

 gether, and from admitting of a joint perfectly watertight At the ordinary 

 thickness of cast-iron pipes, they will cost more than double the prices 

 above given for earthen pipes.— Cond. 



Heating by hot Air and hot Water. — Sir, As economy in horticultural 

 pursuits must promote its interests, every thing that may contribute thereto 

 no doubt must be acceptable to your readers. I have referred to your 

 Gardeners Magazine and also to the Encyclopaedia of Gardening, but can 

 find nothing concerning the transmission of hot air from an adjoining build- 

 ing to a green-house or conservatory. As hot air is now pretty generally 

 made use of in mansions, I see no reason why a portion of it may not 

 be borrowed, sufficient to supply a green-house containing vines on the 

 rafters, but which are not to be forced till the geraniums, &c, are re- 

 moved for the summer, the vines being a secondary object. May not hot 

 air be introduced into a green-house connected to the kitchen range, a wall 

 only intervening, as the fire in the kitchen is seldom extinguished, and, if at 

 all, but for a very short time. I am convinced many persons would have 

 green-houses, &c, in the part of the country I live in, but for the expense 

 of fuel, which is exorbitantly dear. If any of your correspondents would 

 give a paper on the subject, with plans of valves and pipes, and with the 

 greatest extent of distance that heated air may be conveyed and continued 

 at the temperature of 50° to 60°, when the external atmosphere is at 32°, 

 he will oblige, no doubt, many of your readers, and none more than your 

 humble servant, — A Subscriber. Aug.ll. 1827. 



Having had some experience in making attempts to heat hot-houses by 

 hot air, we have been reduced to the opinion, that it is the worst of all 

 modes of heating, on account of its liability to produce extremes ; the 

 difficulty of putting air in motion, and its dryness. If heat is to be con- 

 veyed from a kitchen fire to a green-house, or to any part of a dwelling- 

 house, a going and returning pipe of water is by far the best mode. There 

 can be no doubt that something is to be done in this way ; and one thing 

 which we should like to see adopted in every house is the heating of a 

 bath. A bath might be so contrived, in the alcove of an ornamental green- 

 house, as to serve both as a bath and a stove. A revolution in the mode 

 of heating, both in domestic and hot-house economy, is in commencement, 

 in consequence of the discovery of the hot-water system. Messrs. W. & D. 

 Bailey, of Holborn, are entering fully into it, and we would recommend 

 all our readers who are interested in the subject to consult them. — Cond. 



Earl Powis's Mode of heating by hot Water. — Can you give me any 

 account of this mode of heating, o"f which I have heard a good deal at 

 different times among some of His Lordship's friends ? Is it the same as 

 that of Elcot? or, if it is different, which is the best? — R. W. Nov. 20. 



Earl Powis's mode of heating is described by Mr. Manwaring in Gill's 

 Technological Repository for November 1827, p. 261., and consists in sur- 

 rounding a small steam-pipe, of not more than 2 in. in diameter, 'vith 



B B 4< 



