84 M. IT. Wilde's Experimental Researches 



" greater" and "less," as attention will be chiefly confined to 

 a description of well-defined phenomenal effects. 



8. Though I make use of certain conventional terms in con- 

 nexion with the subject of these researches, it is not thence to 

 be inferred that I hold to the opinion that specific entities 

 distinct from ordinary matter are concerned in the production 

 of phenomena of any kind whatever. 



9. The apparatus with which the experiments were made is 

 shown in Plate II. figs. 1-10. Two blocks of cast iron, A, A, 

 of the form shown in figs. 1, 2, 3, and two pieces of brass, B, B, 

 of the same length as the cast-iron blocks, were bolted together 

 at the top and bottom with small brass bolts, in such a manner 

 as to form a compound hollow cylinder of brass and iron, here- 

 after called the magnet-cylinder. A smooth and parallel hole 

 C, If inch in diameter, was bored through the magnet-cylinder; 

 and the thickness of the brass packings, B, B, separating the 

 iron sides of the cylinder from one another, was three-quarters of 

 an inch, or nearly half the diameter of the hole. Two pillars 

 of wrought iron, D, D (fig. 3), were screwed into the cast-iron 

 projections E, E (figs. 1, 2, 3) at each end of the magnet- 

 cylinder, for the purpose of holding the cross heads E, F, fig. 3. 

 These cross heads were made of brass, and were bored out con- 

 centrically with the hole through the magnet-cylinder, so as to 

 form suitable bearings in which the journals of an armature 

 might revolve. 



10. The armature, which was of the same form as that used 

 by Siemens (figs. 4, 5, 6, 7), was made of cast iron, and was 

 turned parallel throughout its entire length, and about one- 

 twentieth of an inch less in diameter than the hole in the 

 magnet-cylinder, for the purpose of allowing it to revolve inside 

 the cylinder in close proximity to it, but without touching it. 

 The thickness of the rib G, uniting the segmental sides of the 

 armature (figs. 4, 5, 7), was one-quarter of an inch. Two brass 

 disks or caps, H, H', having concentric prolongations for holding 

 the steel journals I, I, were fitted by means of screws, one at 

 each end of the armature. A pulley, K, for driving the arma- 

 ture was fixed upon the cylindrical axis of the cap H'; and upon 

 the axis of the cap H at the other end of the armature, a com- 

 mutator, L, 1/, of hardened steel was fixed. 



11. About 163 feet of copper wire 0*03 of an inch in diameter, 

 insulated with silk, was wound upon the armature (fig. 6) in the 

 direction of its length. The inner extremity of the wire was 

 placed in good metallic contact with the armature, and its outer 

 extremity was connected with the insulated half L' of the com- 

 mutator by means of a clip and binding screw. Bands, encir- 

 cling the armature at intervals, and sunk below the surface of 



