Art. XXIV. Extract of a Letter from Colonel Gibbs to the Editor.
Art. XXIV. Extract of a Letter from Colonel Gibbs to the Editor.
Sunswick, June, 1818.
Dear Sir,
Since I saw you, I have made only one experiment on magnetism. I determined the power of my magnet, as it had been shut up in the dark for a long time, and lying down. I then exposed it to the rays of the sun, also lying down, and remote from the iron support, and I found that it had gained 12 oz. power in 40 minutes, and 14 oz. power only in five hours.
Art. XXV. A New Lamp, without Flame.
Art. XXV. A New Lamp, without Flame.
From the Annals of Philosophy for March, 1818. Communicated by Mr. Thomas Gill.
This lamp is one of the results of the new discoveries in chemistry. It has been found, by Sir H. Davy, that a fine platina wire, heated red hot, and held in the vapour of ether, would continue ignited for some time; but, I believe, no practical use has been made of this fact.