Letter, from George W. Hearn to Sir John Herschel, dated at Royal Military College, Sandhurst Autograph letter signed by sender. Wishes he had seen John Frederick William Herschel's paper before submitting his own; then he could have rectified his errors. Has been carrying out some electrical experiments. Sent abstract to Michael Faraday, who does not understand them. Would be pleased to send John Frederick William Herschel further scientific communications. 14 February 1846