direction, and that the equally slight deflection produced when the contact
was broken, was in the other direction; and also, that these effects
occurred when the first helices were used (6. 8.).

12. The results which I had by this time obtained with magnets led me to
believe that the battery current through one wire, did, in reality, induce
a similar current through the other wire, but that it continued for an
instant only, and partook more of the nature of the electrical wave passed
through from the shock of a common Leyden jar than of the current from a
voltaic battery, and therefore might magnetise a steel needle, although it
scarcely affected the galvanometer.

13. This expectation was confirmed; for on substituting a small hollow
helix, formed round a glass tube, for the galvanometer, introducing a steel
needle, making contact as before between the battery and the inducing wire
(7. 10.), and then removing the needle before the battery contact was
broken, it was found magnetised.

14. When the battery contact was first made, then an unmagnetised needle
introduced into the small indicating helix (13.), and lastly the battery
contact broken, the needle was found magnetised to an equal degree
apparently as before; but the poles were of the contrary kind.

15. The same effects took place on using the large compound helices first
described (6. 8.).

16. When the unmagnetised needle was put into the indicating helix, before
contact of the inducing wire with the battery, and remained there until the
contact was broken, it exhibited little or no magnetism; the first effect
having been nearly neutralised by the second (13. 14.). The force of the