Mj/M Remarks on Mr, E. M. Clarke. 365 



machines, and it was sent to the Adelaide-street Gallery in 

 order that its effects might be compared with those of mine*. 

 Mine was found to excel in the brilliancy of the spark, while 

 M. Pixii's machine was more effective in giving the shock 

 and affecting the electrometer. M. Pixii's machine had a 

 larger keeper and a much greater extent of copper wire. 

 Shortly after, Mr. Newman of Regent-street made a smaller 

 instrument on my construction, which gave the shock more 

 powerfully than my large one did : this also had a greater 

 length of coil, but the effect was at that time partly attributed 

 to the better insulation of the wiie. I then convinced myself 

 by some experiments that the increased shock solely depended 

 on the length of the wire. The cause of the difference of 

 effect in the two cases admitted no longer of dispute after the 

 publication of the experiments of Dr. Henry of Philadelphia, 

 Mr. Jennings, and Dr. Faraday ; as their investigations fully 

 proved that the spark is best obtained from a magneto- 

 electric coil when short, and the shock when it is long. 

 Mr. Clarke has no more claim to the application of the 

 double armature to the magnet than he has to the discovery 

 of the facts which suggested that application. 



In conclusion: I think it will be evident from the preceding 

 statement, that the magneto-electrical machine which Mr, Clarke 

 has brought forward, " after much anxious thought, labour, 

 and expense," is a piracy of mine; the piracy consisting not 

 in manufacturing the instrument, — for everyone isat full liberty 

 to do so, but in calling it an invention of his own and sup- 

 pressing all mention of my name^as connected with it. I do 

 not presume that Mr. Clarke is so ignorant as not to know 

 the meaning of the word " invention," but he has strangely 

 misapplied it by calling several other well-known pieces of 

 apparatus his inventions. Thus he has appropriated to him- 

 self Ampere's Bascule Electrique, and calls it the Electrepeter. 

 Among other uses of this simple contrivance of the French 

 philosopher, it was employed in Pixii's magnet for the pur- 

 pose of changing the direction of the current in the wire. 



24, Sussex-street, London University. Joseph Saxton. 



• See the Literary Gazette, No. 878. 



