222 Magnetical Observations. [Sept, 



be acidulated with muriatic acid. The salt of platinum, if there 

 be any, will remain at the bottom of the liquid, and may be sepa- 

 rated by the filter., 



To obtain the rhodium in the metallic state, the solution contain- 

 ing its triple salt is to be evaporated to dryness, and the dry residue 

 heated in a crucible. It leaves a white metal in a brittle spongy 

 mass, the properties of which will be described hereafter. 



This pruces?, more simple and more exact than that of Wol- 

 laston, depends, 1. On the insolubility of ammonio-muriate of 

 palladium, even in water slightly acidulous. 2. On the solubility 

 of the muriates of copper and iron in alcohol, and the insolubility 

 of ammonio-muriate of rhodium in the same liquid. 



(To be continued.) 



Article X. 

 Magnetical Observations at Hacbipy Wick. By Col. Beaufoy. 



Latitude, 51° 32' 40-3" North. Longitude West in Time 6"-rsV 



181-1. 



1814. 



Mean of 



Observations 



in July. 



Ditto in June. 



'Morning 

 ioon 

 >.rning 



'Morning 



rM« 



< Nr 



I 



rAlornuij 



J Noon 

 (^ Evening 



f Morning 

 Ditto in May. < Noun 



(_ Evening 

 {" Morning 

 Ditto in April. ^ Noon 



(Lteninjr 



at 8* 41' Variation 24" 13' 



at 1 42 Ditto 24 23 



ac 6 58 Ditto 24 17 



at 8 44 Ditto 24 13 



at 1 30 Ditto 24 22 



at 6 52 Ditto 24 16 



at 8 45 Ditto 24 13 



at 1 44 Diito 24 22 



at 6 38 ....Ditto 24 16 



at 8 45 Ditto 24 12 



at 1 48 Ditto 24 23 



at 6 29 Ditto 24 16 



Uv« 



29"" 

 44 

 00 

 10 



48 : 



29 



12 "J 



13 VAVest. 



14 J 



53 

 53 

 30 



VWest. 



