170 



Miscellanies. 



with a little cream of tartar, a coating of silver may be established, 

 which admits of a fine polish. 



9. Movable hood, for smoky chimnies. (J. G.) — The following 

 s described as a simple and effectual cure for smoky chimnies. 



The flue of the chimney terminates in a cylinder of cast or strong 

 sheet iron, (a,) one foot in diameter, firmly set in the top of the ma- 

 sonry. Three light iron rods, (c, c, c,) riveted to the cylinder a, 

 rise about two feet above it, and unite in a piece of iron, (6,) of a 

 triangular shape, and three or four inches long, and having a hemi- 

 spherical termination. This half ball has a hole bored in its upper 

 part, at least an inch deep and one fourth of an inch in diameter, and 

 well tapered to receive the screw e, which is provided wiih a good 

 thumb piece. This screw holds the hood b in its place, and serves 

 as its axis of motion. 



The cone D is of sheet iron, two feet long and two feet in diame- 

 ter. When at rest, its base is horizontal. It has a truncation or flat- 

 tening at the top, four inches at least in diameter, with a hole for re- 

 ceiving the screw. It is made somewhat concave, and the hood must 

 be so adjusted as to turn freely on its axis. 



When the wind blows strongly, the hood is pressed against the 

 chimney on the windward side, and the smoke freely escapes on the 

 opposite side. 



When the chimney is to be swept, the hood is unscrewed and re- 

 moved for the purpose, if necessary. 



