DISCOURSE OF W. B. TAYLOR. 219 



were left projecting, and all numbered, go that the first and the last 

 end of each strand might be readily distinguished. In this manner 

 we formed an experimental magnet on a large scale, with which 

 several combinations of wire could be made by merely uniting the 

 different projecting ends. Thus if the second end of the first wire 

 be soldered to the first end of the second wire, and so on through 

 all the series, the whole will form a continued coil of one long wire. 

 By soldering different ends, the whole may be formed into a double 

 coil of half the length, or into a triple coil of one-third the length, 

 &c. The horse-shoe was suspended in a strong rectangular wooden 

 frame 3 feet 9 inches high and 20 inches wdde." 



Two of the wires (one from each extremity of the legs) when 

 joined together by soldering, so as to form a single circuit of 120 

 feet, with its extreme ends connected with the battery, produced a 

 lifting-power of 60 pounds. The same two wires being separately 

 connected with the same battery (forming a double circuit of 60 feet 

 each), a lifting-power of 200 pounds was obtained, or more than 

 three times the power of the former case with the same wire. Four 

 wires (two from each extremity of the legs) being separately con- 

 nected with the battery (forming four circuits) gave a lifting-power 

 of 500 pounds. Six wires (three from each leg) united in three 

 pairs (forming three circuits of 180 feet each) gave a lifting-power 

 of 290 pounds. The same six wires being separately connected with 

 the battery in six independent circuits, produced a lifting-power of 

 570 pounds, or very nearly double that of the same wires in double 

 lengths. When all the nine wires were separately attached to the 

 battery a lifting-power of 650 pounds was evoked. In all these 

 experiments "a small single battery was used, consisting of two con- 

 centric copper cylinders, with zinc between them ; the whole amount 

 of zinc-surface exposed to the acid from both sides of the zinc was 

 two-fifths of a square foot; the batteiy required only half a pint of 

 dilute acid for its submersion." 



" In order to ascertain the effect of a very small galvanic element 

 on this large quantity of iron, a pair of plates exactly one inch square 

 was attached to all the wires; the weight lifted was 85 pounds." 

 For the purpose of obtaining the maximum attractive power of this 

 magnet, with its nine independent coils, "a small battery formed 



