invented hy John Penn^ Esq., Le\soisham. 



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air-tight ; those in the sheds, being of rough boards rudely joined, 

 have the joints covered with strong paper pasted or glued on : 

 if the openings were carried up in the wall, of course this case 

 would not be requisite. This description and these diagrams 

 have been made entirely from recollection of a visit made to Mr. 

 Penn, in company with Mr. Wilmot of Isleworth, on February 

 5th, in which Mr. Penn kindly showed and explained everything; 

 and therefore they must not be considered as exact, but merely 

 as giving a general idea of what has been effected. 



Though Mr. Penn only began his improvements not quite 

 three years ago, and has not yet completed all his experiments, 

 he has already heated several hot-houses for different noble- 

 men and gentlemen by his mode ; and some, such as one at 

 Syon House, have been heated after Mr. Penn's mode (though 

 imperfectly), by others who have seen or heard of it, and endea- 

 voured to possess themselves of the invention, without under- 

 standing it. Houses have been heated by Mr. Penn, for the 

 Earl of Clare, in Ireland ; the Earl of Dartmouth, Blackheath ; 



Charles Perkins, Esq., Southend, Kent; Palmer, Esq., 



Bromley ; Keats, Esq., Forest Hill ; General Sir More 



Disney, Acton ; Charles B. Curtis, Esq., Acton ; John Wilmot, 

 Esq., Isleworth, and others. He has also warmed the dwelling- 

 house of B. Wood, Esq., M. P., Eltham Place ; and that of 

 Crowley, Esq., Croydon ; as well as his own billiard- 

 room, at Lewisham. All Mr. Penn's plant-houses at Lewisham, 

 as well as his billiard- room, though scattered up and down his 

 garden, are heated from one small boiler. 



It may be useful to state that Mr. Penn, being an engineer, 

 and in a very large way of business as a manufacturer of steam- 

 engines, and all sorts of machinery, and having large iron-works, 

 being a man of large property, and being, besides, most anxious 



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