mouthpiece,
A, may be turned from wood in any shape desired, but have a flange
on the back side that will make a tight fit with the outside of
the shell.

Fill the paper tube with powdered carbon, E, which can be made by
pounding and breaking up pieces of carbon to about the size of pin
heads. Powdered carbon can be purchased, but if you make it be
sure to sift out all the very fine particles. Assemble the parts
as shown and the transmitter is ready for use. If speech is not
heard distinctly, put in a little more, or remove some of the
carbon and try it out until you get the instrument working nicely.
--Contributed by Harold H. Cutter, Springfield, Mass.

** Quickly Made Lawn Tent [398]

A very simple way of erecting a lawn tent for the children is to
take a large umbrella such as used on delivery wagons and drive
the handle into the ground deep enough to hold it solid. Fasten
canvas or cotton cloth to the ends of the ribs and let it hang so
that the bottom edge will touch the ground. Light ropes can be
tied to the ends of the ribs and fastened to stakes driven in the
ground in a tent-like manner to make the whole more substantial
and to stand against a heavy wind. This makes an exceptionally
fine tent, as the umbrella

[Illustration: Lawn Tent Complete]

is waterproof; also, there is more room to stand up in than in a
tent that is in the shape of a wigwam.
--Contributed by J.A. Whamer, Schenectady, N. Y.

** How to Make a Windmill of One or Two Horsepower for Practical
Purposes [399]

A windmill for developing from 1/2 to 2 hp. may be constructed at
home, the expense being very small and the results highly
satisfactory.

The hub for the revolving fan wheel is first constructed. One good
way to get both the hub, lining, shaft and spokes for the blades,
is to go to a wheelwright's and purchase the wheel and axle of
some old rig. There are always a number of discarded carriages,
wagons or parts thereof in the rear of the average blacksmith's
shop. Sometimes for half a dollar, and often for nothing, you can
get a wheel, an axle, and connected parts. Remove from the wheel,
all but the four spokes needed for the fans as in Fig. 1. The same
hub, axle and bearings will do. In case you cannot secure a wheel
and shaft, the hub may be made from a piece of hardwood, about 4
in. in diameter and 6 in. long. A 2-in. hole should be bored
through for a wooden shaft, or a 1-1/2-in. hole for a metal shaft.
The hub