Scientific Intelligence. — Arts. 205 



tract the throat of his chimney in the following judicious man- 

 ner. He caused the entire opening at the bottom or throat of 

 the chimney to be closed up, with the exception of an upright 

 flue, just above the top of the grate, about a foot wide and high, 

 and which led into the chimney. To the face of this flue he 

 applied a square flat frame of wrought iron, having upright 

 grooves made on each side of it, in which a sort of hood, made 

 of sheet-iron, could slide up and down. This hood is open be- 

 hind ; it projects about a foot square in front of the chimney 

 back, over the fire-place or grate ; it is sloped off" at its top, to- 

 wards the back of the chimney, and it has a handle in front of 

 it to raise and lower it by. When the hood is elevated, it serves 

 to guide the smoke and heated air into the upright opening 

 leading into the chimney, its sides being closed to fit the up- 

 right back of the fire-place ; and the fire then burns in the usu- 

 al manner, but the chimney never smokes. When, however, 

 he wishes to excite the fire at any time, he lowers the hood un- 

 til its bottom nearly reaches down to the tops of the cheeks, or 

 two keepers of the grate, and the fire, by the draught thus 

 caused, instantly revives. In addition to this hood, he likewise 

 occasionally hangs upon ledges, formed upon each side of it, an 

 appendage made of sheet-iron, which lengthens it so that its 

 sides fit close upon the tops of the keepers, and thus the air can 

 only gmn access to the fire through the front and bottom bars of 

 the grate, and then, indeed, the fire burns most vehemently. — 

 GiWs Technological Repository^ May 1828. 



List of Patents granted in England from \st February to \^th 



April 1828. 

 1828. 

 Feb. 1. To Robert Barlow, of Jubilee Place, Chelsea, county of Middle- 

 sex ; for " a new motion for superseding the necessity of the or- 

 dinary Crank in Steam-Engines." 

 To JoHK Frederick Daniel, Esq. of Gower Street, Bedford 

 Square, London; for "improvements in the manufacture of Gas." 

 To John Oldham, of the City of Dublin, gentleman; for "improve- 

 ments in Wheels for driving machinery, to be impelled by water 

 or wind, also applicable to boats and other vessels." 

 To Ralph Hindmarsh, Newcastle-upon-Tyne, Master-mariner ; for 

 " an improvement in Capstans and Windlasses." 



