Mr. R. Phillips on the Magnetism of Steam. 285 



core. The smaller pewter tube projected from the larger to the 

 extent of about 2 inches at one end and *3 inch at the other ; I 

 shall call these the longer and shorter ends of the pipes. A 

 T-piece was nowplaced on thelongerend of thepipes,so that while 

 it could receive the discharge from the larger pipe, the smaller 

 pipe was allowed to stand through the straight way of the 

 T-piece ; a stop-cock was placed on the branch of the T-piece, 

 which therefore served to regulate the flow of steam through 

 the outer coil. The end of the smaller pipe after its exit from 

 the T-piece was also furnished with a cock, having a steam- 

 way 2 5 o Hlcn diameter ; I call this stop-cock S. The shorter 

 end of the pipes terminated in a short brass connecting piece, 

 the steam-way of which was much larger than the combined 

 steam-ways of the coil, and this connecting piece served to 

 unite the coils with the condenser of the hydro-electric machine. 

 The condenser was interposed between the boiler and the 

 coils during all these experiments, but it was always dry, ex- 

 cept where it is said that water was placed in it. The coil 

 having been thus connected with the boiler, one end of a 

 piece of soft iron, 1 inch diameter and 8 inches long, was in- 

 serted in the coil ; the iron was supported quite independently 

 of the coil, and the axis of the iron and coil of course lay in 

 a horizontal plane. Supposing the back of a watch to have 

 been placed against the east end of the iron core, the steam 

 circulated in a contrary direction to the motion of the hands 

 of the watch. 



132. The stop-cock on the branch of the T-piece was closed 

 and S opened, then, the coil being cool, on opening the cock 

 of the boiler, the needle flew across the field of view towards 

 C; with a single puff the motion was perhaps through an 

 angle of 5°. 



133. The stop-cock on the branch of the T-piece was 

 opened a little, and the cock of the boiler was opened ; an 

 agitation of the needle, or a swing to C, was always observed ; 

 as soon as it subsided and steam issued from the branch stop- 

 cock, S was opened, the needle immediately started off to A; 

 the swing, although less than the foregoing, could easily be 

 made by successive puffs quite visible to the unassisted eye. 



134. The iron was now removed from the coil, and the last 

 experiment repeated. On opening S the needle went towards 

 A, and by successive puff's it could be vibrated across the field 

 of view and checked by inverse puffs, but the amount of 

 motion was much less than when the iron was in the coil; 

 thus showing that the iron had been magnetized by this ap- 

 parently new magnetic force. The swing to C was also much 

 reduced (26.). Water was now placed in the condenser, and I 

 think the swing to A became more powerful in consequence. 



