to
run in loosely. Now put all these parts together, as shown in the
illustration. Do not fasten the sides too securely until you have
tried the device and are sure it will run smoothly. For the crank
a bent piece of stout wire or a nail will serve, though a small
iron wheel is better, as it gives steadiness to the motion. In
this case a handle must be attached to the rim of the wheel to
serve as a crank. The drive wheel from a broken-down eggbeater
will do nicely. For ease in handling the pump, a platform should
be added.

To use the pump, fill the tube with water and place the lower end
of the tube in a reservoir of water. Make a nozzle of the end of a
clay pipe stem for the other end of the tube. Then turn the crank
from left to right. The first wheel presses the air out of the
tube, creating a vacuum which is immediately filled with water.
Before the first wheel releases the tube at the top, the other
wheel has reached the bottom, this time pressing along the water
that was brought up by the first wheel. If the motion of the
wheels is regular, the pump will give a steady stream. Two feet of
1/4-in. tubing, costing 10 cents, is all the expense necessary.
--Contributed by Dan H. Hubbard, Idana, Kan.

** How to Make a Fire Screen [82]

[Illustration: FIG.2 Made of Strap Iron]

A screen which will not interfere with the radiation of the heat
from the fire, and will keep skirts and children safe can be made
at little expense out of some strap iron. The screen which is
shown in Fig. 1, stands 20 in. high from the base to the top
crosspiece and is made of 3/4 by 1/4-in. and 1/2 by 1/4-in. iron.
The top and bottom pieces marked AA, Fig. 1, are 3/4 by 1/4 in.
and are 30 in. long, bent at an angle to fit the fireplace 7 in.
from each end, as shown in Fig. 2. The three legs marked BBB, Fig.
1, are of the same size iron and each leg will take 34 in. of
material. In shaping the feet of these three pieces give them a
slight tendency to lean toward the fire or inside of screen, says
a correspondent in the Blacksmith and Wheelwright. In the two
cross bars 1 in. from each end, A in Fig. 2, mark for hole and 3
in. from that mark the next hole. Take the center of the bar, B,
15 in. from each end, and mark for a hole, and 3-1/2 in. on each
side mark again and 3-1/2 in. beyond each of these two, mark
again.

Mark the legs 2-3/4 in. from the bottom and 2 in. from the top and
after making rivet-holes rivet them to the cross