Bij Mr. Henry Stothert. 



201 



other, is then returned, still inclining, and passed out at the bottom 

 of the bore immediately under the place where it entered ; it is 

 then formed into a syphon about three feet deep, from whence the 

 condensed water is conveyed away. A smaller pipe is also con- 

 nected with the top of the large one, to receive the increase of 

 water by expansion when heated, which, as the large pipe cools, 

 returns into it again. Its success, in this instance, led to its adop- 

 tion in many other situations, more especially in an elegant iron 

 conservatory belonging to the Marquess of Aylesbury, at Totten- 

 ham Park, forming nearly one-fifth of a circumference of a circle 

 whose radius at the front is ninety feet, the extent of which is 

 105 feet, and the width twenty-four feet, the whole front and roof 

 being glazed. 



Fig. 11 shews the arrangement of the front pipes under the 

 floor. The air being admitted from the air-chamber underneath, 

 through an opening extending the whole length of the pipes, and 

 passing through the upper chamber on each side of the pipes, is 

 discharged through the grating into the house. The arrangement 

 of the back pipes is similar. 



Shallow cisterns are connected with the upper part of the pipes, 

 about eighteen feet from each other, by means of hollow screws, 

 which admit the water to pass to and fro reciprocally ; the capacity 

 of the cistern is more than sufficient to receive the increased bulk 

 of the water which expands when heated, and returns again 

 into the pipes as the water cools. 



The external diameter of the front pipes in this instance is thir- 

 teen inches, and of the back pipes ten inches and a half; each set of 

 pipes is divided in the middle of their length, except that the nearest 

 division of the front pipes returns about half way round, the end 

 being in length rather more than sixty feet. These have one and a 

 quarter inch steam pipes, extending the whole length, and returning 

 again, preserving a regular inclination throughout their whole length. 



