Book-bot.com - read famous books online for free

Scientific American Supplement, No. 794, March 21, 1891 by Various
page 113 of 146 (77%)
our streets, instead of performing its former function of turning day
into night and ruining our health; but as I am not at all sure of the
engineering possibilities of such a scheme, I will leave its discovery
to some other abler prophet than myself.

(_To be continued_.)

* * * * *




ELECTRICAL LABORATORY FOR BEGINNERS.

BY GEO. M. HOPKINS.


It is only when theory and practice, study and experiment, go hand in
hand that any true progress is made in the sciences. A head full of
theory is of little value without practice, and although the student
may apply himself with all his energies for years, his time will, to a
great extent, have been spent in vain, unless he by experiment rivets
the ideas he gains by his study.

In the study of electricity, for example, let the student try to
remember the position a magnetic needle will take when placed below or
above a conductor carrying a current which flows in a known direction.
Without experiment there are nine chances of forgetting to one of
remembering; but let the student try the experiment, and he will ever
afterward be able to determine the direction in which the current is
DigitalOcean Referral Badge