--XVIII. Apparatus for Static
Electricity.--XIX. Electric Motors.--XX. Odds and Ends.--XXI. Tools and
Materials.

"The author of this book is a teacher and writer of great
ingenuity, and we imagine that the effect of such a book as this
falling into juvenile hands must be highly stimulating and
beneficial. It is full of explicit details and instructions in
regard to a great variety of apparatus, and the materials required
are all within the compass of very modest pocket-money. Moreover,
it is systematic and entirely without rhetorical frills, so that
the student can go right along without being diverted from good
helpful work that will lead him to build useful apparatus and make
him understand what he is about. The drawings are plain and
excellent. We heartily commend the book."--Electrical Engineer.

"Those who visited the electrical exhibition last May cannot have
failed to notice on the south gallery a very interesting exhibit,
consisting, as it did, of electrical apparatus made by boys. The
various devices there shown, comprising electro-magnets, telegraph
keys and sounders, resistance coils, etc., were turned out by boys
following the instructions given in the book with the above title,
which is unquestionably one of the most practical little works yet
written that treat of similar subjects, for, with but a limited
amount of mechanical knowledge, and by closely following the
instructions given, almost any electrical device may be made at
very small expense. That such a book fills a long-felt want may be
inferred from the number of inquiries we are constantly receiving
from persons desiring to make their own induction coils and other
apparatus."--Electricity.

"At the electrical show in New York last May one of the most
interesting exhibits was that of simple electrical apparatus made
by the boys in one of the private schools in the city. This
apparatus, made by boys of thirteen to fifteen years of age, was
from designs by the author of this clever little book, and it was
remarkable to see what an ingenious use had been made of old tin
tomato-cans, cracker-boxes, bolts, screws, wire, and wood. With
these simple materials telegraph instruments, coils, buzzers,
current detectors, motors, switches, armatures, and an almost
endless variety of ap