On pvre Nickel, 137 



following arrangement, which we think well calculated to 

 answer the purpose, has been su-ggested to us by Mr. Cor- 

 nelius Yarlev, a young artist who distinguishes himstU' no 

 less fey his mechanical abilities than by the exquisite pro- 

 ductions ot" his pencil in water colours: — Get a frame made 

 of common deal or any kind of wood, three or four inches 

 deep, covered with a plate of glass, and open at one side; 

 and let the side opposite to this have a round opening com- 

 municating, by means of common iron pipe, with the ash- 

 pit of any little stove or other iirc-place, shut up from all 

 other access of air but what must pass through the pipe. It 

 is obvious that ai.v fumes rising from a copj->er-plate laid 

 under such a fiame will be carried backward into the iron 

 pipe by the current of air required to maintain combustion 

 in the stove, and will by this means be carried up the chim- 

 ney in place of being allowed to flv about in the apartment. 

 The pipe may be very conveniently iised by carrying it 

 down through the table to the floor, and so along to the 

 place where the chimney may chance to stand ; and when 

 the frame is not wanted, the pipe at one of the joinings 

 (as at A, Plate V.) may be made to answer the purpose of 

 a hinge bv which to turn up the frame atrainst the wall, as 

 marked by the dotted lines, where it may be secured, while 

 out of use, by a button or any other contrivance. 



XXIX. On pure Nickel, discovered to le a nolle Mefal; on 

 its Preparation and Properties. By J. B- Kichtek*. 



VV HEN sulphate of ammonia and nickel are repeatedly 

 crvstallized, the whole of the cobalt, excepting a very 

 minute quantity, is separated ; but there still remains sonie 

 copper mixed with the salt. I some time ago announced, that 

 this metal may be separated from the nickel by subliming tl e 

 Jatterwith sal ammoniac, but I had not then ever obtanieU 

 pure nickel. With the compound salt of nickel and am- 

 monia there still remains a little arsenic. Iron also may be 

 in it, if we have been a little too sparing io the addition of 

 nitric acid to the sulphuric solution of cobalt containing 

 nickel. 



I attempted to separate these extraneous metals in the 

 humid wav, but without complete success. Bv means oi 

 •rarbonate of potash, I decomposed the triple ammoniacal 



• From /'a?! Muus'^Jcumal Ut C>'.."ut, vol. vi. 



suh 



