332 On Resistance to Electric Current 



If the shock was received through 166 inches of the same wire not stretched 

 upon glass, without any knots in it, it seemed not at all greater, but if anything 

 less than the simple shock. It was the same if received through a piece of wire 

 of about the same length with 37 knots in it. 



641] Some more of the same wire was stretched by silk into 32 x 12 rows, 

 each 78-7 inches long; consequently the whole length was 30,220 inches. It 

 weighed 3272 grains, id est, 9-24 inches to a grain. 



The shock of the above-mentioned tubes was sensibly greater when received 

 through this last wire than when received simply, but was considerably less 

 than when received through the first wire. 



They were then compared by sound with the same tube charged to sj, 

 when the sound of the shock passed through the new wire was sharper, and 

 the other fuller. 



The sound of the shock passed through the new wire seemed full as brisk, 

 and the light as white as of that passed through -55 of sat. sol., but not near 

 so strong as when the wires in sat. sol. were in contact, the sound and light, 

 however, seemed nearly of the same kind. When distance in tube was i-i the 

 sound was evidently less loud than that with the wire. 



When the shock was allowed to pass through both wires, the sound, I 

 thought, seemed much of the same kind as when passed through new wire 

 singly. 



The shock passed through both wires felt plainly greater than the simple 

 shock, and the difference seemed greater than that between the new wire 

 simply and the simple shock. 



In the foregoing the shock passed at the same time through both wires, 

 but it was then tried so that it should first pass through old and from thence 

 through new wire. 



The shock felt then evidently stronger than the simple shock or that through 

 new wire alone, but I could not tell whether it was greater or less than that 

 through the old wire alone. 



642] A piece of the same wire was wound about 150 times round one of 

 the slips of glass, and was laid flat on another of these slips which lay flat on 

 a table. 



The shock of these tubes seemed rather greater when received through this 

 wire than when received simply, but the difference was not considerable, but 

 it seemed evidently less than the shock received through the new wire. 



643] The wire was taken from off the reel with the slips of glass, and all 

 except a small part of it stretched round the garden in 14 rounds. The shock 

 of the above-mentioned tubes received through this wire felt plainly greater 



