3^ BENDING WOOD. 



The fand-ftove is covered throughout its whole length, to 

 retard the evaporation of the moifture contained in if, and 

 allow the heat to accumulate fuffieiently to give the wood the 

 proper temperature. 

 Manipulation The pieces of timber are introduced at the ends, placed in 



forthchcac tf, e niiddle of the flove in the direction of its length on bars 

 fixed for the purpofe, and covered with fand. 



When the timber has been heated and penetrated with 

 moifture to the proper degree for enabling it to aflame the de- 

 gree of curvature required, it is bent to a line defignating the 

 curve. 

 The wood may The timber may be bent in two ways, either horizontally or 

 zpntaMyor ver- vertically; the former is ufed for pieces of fmaller dimenfions 

 tkally, and greater curvature. 



—by any me- In either way the force that produces the curve is applied 



chamc power; by means f ro pes, tackles, or even capftans. The piece 



mud be kept in the (nape to which it is brought, and thus left 



to dry and grow cold, when it will retain the curvature given 



to it. 



-.which may be Frequently when the piece of wood is thin, prefTure by 



applied various hand, or by weights, will bend it fuffieiently, fo that it will 



retain its fliape on cooling. But the means of bending it may 



be varied to infinity, according to the elafticity of the timber, 



its fize, its temperature, and its humidity. 



VII. 



Experiments made in the great, in a reverberating Furnace onCafi 

 Iron, confirming the ejlabliflied Theory refpecling the Difference 

 between cuft and malleable Iron. By G. A. Lampadius, 

 Prof, of Chemijlry and Metallurgy at Freyberg* 



The reverber«i- 1 SHALL firft defcribe the reverberatory furnace ufed in 

 fcr7bed U . rnaCC dC ~ thefe experiments. It had three principal parts: 1. the air 



tunnel 



* Extracted by J. F. Daubruflbn, in the J. des Mines, from the 



Sammlung PraSiifch-chemifcber Abhandlungen <■ Practical Chemical 



Eflays,' of Lampadius, Vol. II. p. 1 4j. 



Priiequeftion I n l ~y5, the Royal Society of Bohemia propofed as a prize quef- 



o( Bonemian tion to fettle the theery of the refining of iron, taking as abatis the 



Society, 1795. 1 abouis of Vandcrmonde, Beithollet, and Monge, on the different 



ilates 



