$0^ Mr. R. Phillips on the Magnetism of Steam. 



heating the zinc shield ; and thus this motion could be pro- 

 duced or avoided at pleasure, and was, I think, sufficiently 

 accounted for. 



7. The steam was obtained from a small hydro-electric 

 machine; and the various apparatus for effecting the discharge 

 were screwed into the condenser at the place made to receive 

 the Armstrong's jet. The condenser was always dry, except 

 where I have noted the contrary, and the steam was discharged 

 horizontally towards the north. 



8. A galvanic current was sent through a wire in the neigh- 

 bourhood of the galvanoscope ; the wire lay parallel with the 

 needles in the path taken by the steam (9.), and acted about 

 equally on both ; the wire of course lay about north and south, 

 and the electricity passed along it from north to south, sup- 

 posing the current to pass through the conducting wire of a 

 voltaic circle from the platinum to the zinc. When the circuit 

 was completed, the needle moved to one side, A, of the field 

 of view from the opposite side C. Throughout these experi- 

 ments the motion of the same end of the same needle was 

 always recorded, and the galvanoscope always stood to the 

 east of the current of steam. 



9. To a brass jet, 1*8 inch long, was fastened a piece of glass 

 tube, 1 1'Sinches long and /^ inch diameter inside,and thejunc- 

 ture was made tight, or nearly so, with caoutchouc ; the aper- 

 ture at the end of the brass jet which projected from the con- 

 denser (7.) was circular, and yg inch in diameter. The nearest 

 point of the convex surface of the zinc shield was about j^ 

 inch from the glass tube; the stage of the microscope in this 

 and the following experiments came nearly close to the shield. 

 The fibre which suspended the needles was about If inch 

 from the nearest part of a plane drawn through the end of the 

 brass jet, and making a right angle with its bore; the steam 

 was used in this experiment at about 35 lbs. on the inch. 

 Things being so arranged, I found when the steam was turned 

 on that the needle immediately began to move towards C ; and 

 by alternately checking the steam and letting it off", a consi- 

 derable swing of the needles was produced; and by reversing 

 the times of letting off" the steam, the swing of the needles 

 could be again reduced. I had ascertained by pi'evious trials, 

 that turning the cock of the boiler without letting off" the steam 

 produced no effect on the needles. The experiment was made 

 by screwing a stop-cock in the place of the above-mentioned 

 brass jet; and then the cock of the boiler could be worked 

 without letting off* the steam, and without affecting the galva- 

 noscope. 



10. The galvanoscope was raised a few inches, so that the 



