the
wheel a little. The magnet attracts one of' the teeth on the
wheel, but as soon as it is parallel with the core of the magnet
the circuit is broken and the momentum of the wheel brings another
tooth to be attracted.

To reverse the motor reverse the connections and start the wheel
the other way. Be sure that the frames are screwed down well or
the motor will run jerkily and destroy the connections.
--Contributed by F. Crawford Curry, Brockville, Ontario.

** How to Make a Propelling Vehicle [402]

[Illustration: Fig. 1]

Any boy, with a little knack and a few odd tools, can rig up
various contrivances which will be a source of pleasure to himself
and oftentimes can be sold, to less ingenious boys, for a snug
little sum. Any tool a boy can obtain is apt to be of use to him,
chisel, bit, jack-knife or hammer.

Figure 1 shows what two boys did with old cycle wheels. They went
to some junk shops where the concerns had purchased cast-away
bicycles and noticed that there were numerous wheels in very good
order that could be selected from among the sets of wheels with
broken or bent rims, spokes, burst tires, etc. In fact, the lads
had no trouble in getting several sets of bicycle wheels in good
condition for very little money. These wheels were taken to the
back-yard shop of the boys where the young fellows had rigged up a
shed-like affair and put in a bench. The previous Christmas one of
the boys received a box of tools as a gift, in which was included
a little hand vise and the required tools for general boy's
handiwork.

Four of the cycle wheels they used in making the hand-propelled
vehicle shown at Fig. 1.

[Illustration: Fig. 2]

A wooden body, A, made of smooth boards rests upon shafts. Fixed
on this body is an upright carrying the sprocket B. The upright is
a piece of wood about 10 in. high and 4 in. wide, fitted with one
of the bearings from the cycle. The regular cycle chain sprocket
is used at B as well as upon the shaft. The regular chain of the
cycle is likewise employed, so, when buying the wheels, it is well
to select one or more chains with corresponding sprockets from the
junk heap. The detail of the adjustment of the parts is shown in
next views. The letter D signifies the seat which is a box. The
steering gear is a bent iron rod, also found in the waste pile of
the junk shop, and is bent to right form by heating and bending
over on a rock or any solid matter. The steering rod is marked