based upon the use of the voltaic current.

* * * * *

Prof. Dolbear observes that if a galvanometer is placed between the
terminals of a circuit of homogeneous iron wire and heat is applied, no
electric effect will be observed; but if the structure of the wire
is altered by alternate bending or twisting into a helix, then the
galvanometer will indicate a current. The professor employs a helix
connected with a battery, and surrounding a portion of the wire in
circuit with the galvanometer. The current in the helix magnetizes the
circuit wire inclosed, and the galvanometer exhibits the presence of
electricity. The experiment helps to prove that magnetism is connected
with some molecular change of the magnetized metal.

* * * * *




ELECTRICAL TRANSMISSION AND STORAGE.

[Footnote: From a recent lecture in London before the Institute of Civil
Engineers.]

By Dr. C. WILLIAM SIEMENS, F.R.S, Mem. Inst. C.E.


Dr. Siemens, in opening the discourse, adverted to the object the
Council had in view in organizing these occasional lectures, which were