286 Mr. R. Phillips on the Magnetism of Steam, 



135. The brass connecting piece which united the short 

 end of the pipes to the condenser was taken away from the coil, 

 and another T-piece was now placed on the other end of S, and 

 the stop-cock removed from the branch of the former T-piece; 

 the branches of these T-pieces stood parallel and were united 

 by a piece of pewter tube bent like the letter U. The last- 

 added T-piece was united to the boiler. By this arrangement 

 it will be seen, that on opening the cock of the boiler the steam 

 could always enter the outer coil, but not the inner coil unless 

 S was open. The iron core was placed in the coil, and the 

 steam circulated in the same direction as before. When the 

 steam was turned on the swing was to A, whether S was open 

 or not, but stronger when S was open. I thought too much 

 steam escaped from between the two pipes at their shorter 

 end, notwithstanding the end of the outer pipe had been con- 

 siderably contracted; this discharge was sufficiently diminished 

 by twisting a quantity of thread about the place where the 

 larger pipe ended. 



136. The coil being cool and S closed, the cock of the 

 boiler was opened ; the needle was much agitated, being driven 

 a little in one direction and then in the other very irregularly, 

 but in the main towards A. As soon as the needle became 

 tolerably steady I began to open and shut S at the alternate 

 vibrations of the needle, but could not obtain a certain swing 

 in either direction. The stop-cock S was now closed, and 

 afterwards the cock of the boiler, then S was immediately 

 opened, which sent the needle rather strongly towards C. 



137. Another stop-cock, V, was now placed at the shorter 

 end of the pipes, and affixed so as to receive the steam only 

 from the inside coil ; the steam could escape from between the 

 two coils as in the last experiment (136.). The cocks S and 

 V were thrown open ; there was a strong swing to A as before, 

 when the cock of the boiler was opened. S was now shut, 

 and after sufficient time had elapsed to allow the coil to be- 

 come well heated, on working S with each alternate vibration, 

 a scarcely perceptible swing to A was produced when S was 

 opened, which swing-producing power generally went off after 

 some puffs. V was now closed and the cock of the boiler and 

 S opened. On opening V the needle started for C. Both 

 the swings to A and C were as strong as before (132, 133.), 

 but regarding the direction of the steam, it is to be observed 

 they were inverted. 



138. The stop-cock V was now so united to the shorter 

 end of the pipes, as to receive the discharge from between the 

 coils as well as that of the inside coil. The steam circulated 

 in the same direction as the hands of the watch, and the iron 

 core was still in the coil. When the cock of the boiler was 



