instruments
and apparatus, under the name of "Toy-Making," for it is just as
impossible for most boys to get the parts for such things as it is for
them to do the required machine work even after they have the raw
materials.

Great care has been taken in designing the toys which are described in
this book, in order to make them so simple that any boy of average
ability can construct them out of ordinary materials. The author can
personally guarantee the designs, for there is no guesswork about them.
Every toy was made, changed, and experimented with until it was as
simple as possible; the drawings were then made from the perfected
models.

As the result of the enormous amount of work and experimenting which
were required to originate and perfect so many new models, the author
feels that this book may be truly called "Real Electric Toy-Making for
Boys."

* * * * *

Every Boy Should Make Electrical Toys.

A MOTOR THAT CAN DO THINGS

The "St J. Motor No. 1" (List No. 2201) is designed for students and
others who want a small motor for experimental purposes as well as
for all of the work that any small motor can do. We believe this to
be the best small motor made, and we know that it can be used in
more ways than any other motor of equal cost ever built. It has four
binding-posts,--making it possible to energize the field or armature
separately,--and so it can be used in circuits with reversers and
rheostats for experiments. The speed and direction of rotation can be
changed at will, thus adapting it for running toys, etc. As the
binding-posts are mounted upon the frame, this motor can be taken from
the base for remounting and using in many ways, and as it has a
three-pole armature it will start promptly in any position. The shaft
carries a pulley, and a fan can be added at any time. One cell will give
a high speed, and more cells may be added, according to the work it has
to do.

Motor No. 1 stands 3-1/2 inches high. It is finished in black enamel
with nickel-plated trimmings,--strong and well made. With it are
furnished three nickel-plated connecting-straps, which are to be used
for connecting the field and armature in "series" or "shunt." So much
can be done with this motor that it is simply impossible to tell it
here; in fact, it is used as the basis for a whole book of 60
experiments called "The Study of Electric Motors by Experiment," and,
when used in connection with the o