On the Comlinations of different Metals, &fc, S3 



The rope is of the best tarred kind one inch and a half in 

 circumference, and spliced together. 



The carriages of the wheel are each fixed to the frame 

 by two screw pins, and the variation of the rope is re- 

 medied by slackening of the nuls. 



What this machine will thrash when corn yields well, 

 I am not prepared to say. 



It has been tried with the worst of every sort of grain, 

 and thrashed it perfectly clean. 



With the labour of two men, and that about the same 

 as when using the flail, it thrashed of the last season from 

 thirty to thirtv-six bushels (eight and half gallon measure) 

 of wheat per' day, which witl warrant an expectation of 

 considerably more in a good yielding year. 



In the late wet spring I found it exceedingly useful to 

 employ my men on those days when nothing out of doors 

 couid be done; and although with a winch it may be not 

 quite applicable to the cpse of every large farmer, still I 

 am persuaded a considerable part of the farming interest 

 will find it of real advantage as an auxiliary, if not a prin- 

 cipal machine, and to the small occupier 1 can recommend 

 it as the most effective hand machine yet in use. 

 I am, sir. 



Your most obedient servant, 



Dunchurch Lodge, May 2, 1812. RiCHARI) TaWNEY. 



XVI [. An ykcoiint of some Erperimenfs on the Comlinations 

 of different Metals and Chioriiie, &'c. By John Daw, 

 Esq. Communicaied In/ Sir Humphry Davy, Knt. 

 LL.D. Sec. R. S. 



[Continued from p. 12.] 



3. On the Combinations of Iron and Chlorine. 



As there are two oxides of iron, so there are also two 

 distinct combinations of this metal and chlorine. One 

 may be directly formed by the combustion of iron wire in 

 chlorine gas; it is that volatile compound described by Sir 

 Humphry Davy in his last Bakerian Lecture, which con- 

 denses after sublimation in the form of small brilliant iri- 

 descent plates. The other, I find, may be procured by 

 healing to redness, in a glass tube with a very small orifice, 

 the residue which is obtained by evaporating to dryness the 

 green muriat of iron ; it is a fixed sui)8tance requiring a red 

 heat for its fusion; it is ot a grayish but variegated colour, 

 F 2 of 



