Intellisetice and MisceUa?ieous Articles. 



459 



John BuUocke, Esq., Falmouth ; John Samuel Enys, Esq., of Enys; 

 Richard Fox, M.D., Falmouth ; Charles James Fox, M.D., Plymouth j 

 John Gilbert, Esq., Eastbourne; Day Le Grice, Esq., Trereife ; 

 James Plomer, Esq., Helston^ The Rev.Tliomas Robyns, Marystone; 

 Thomas Robins, Esq., Leskeard; John Terrell, Esq., London. 



LXXVII. Intelligence and Miscellaneous Articles. 



NEW FORM OF AN EXPERIMENT IN ELECTRO-MAGNETISM; BY 

 MR. JOHN LEWTHWAITE. 



IT had frequently occurred to me that Mr. Faraday's experiment 

 of the wire rotating round the magnet, and the magnet round the 

 wire in two separate vessels, might be simplified by making the 

 wire and magnet to rotate round each other in one vessel, and the 

 plan I adopted is as follows : A BCD is a glass vessel with a hole 

 in the bottom, through which passes the wire EF with a hook at 



Fig. 1. 



Fig. 2. 



-v 



E, and a cup at F. To the hook E is affixed by means of a thread, 

 the magnet GE floating nearly perpendicular in mercury; HG is a 

 copper wire bent at H into the form of a hook, and amalgamated 

 at both ends to insure perfect contact with the mercury in the glass 

 vessel, and also with the hook H of the support HI which screws 

 into the mahogany stand KL. The apparatus being thus arranged, 

 a single zinc plate, six inches square, placed in a copper vessel with 

 diluted nitrous acid, and a communication being made by means of 

 a wire between the negative or copper side of the battery and the 

 cup I, also another communication with the positive or zinc of 

 the battery with the cup F, the wire and magnet will immediately 

 commence a rotatory motion about each other, and that too in the 

 direction of the arrows represented in fig. '2. viz. the wire HG will 

 move in the direction of Y, and the magnet in the direction of Z. 

 Kothcrhithc, July 10,1827. 



ARGILLACEOU.S CARBONATE OF IRON. 



Dr. Colquhoun has analysed many specimens of this ore, and has 

 3 N 2 given 



