ccuracy will occur
from wind currents. To find the fall of snow, pour a known
quantity

[Illustration: Rain Gauge]

of warm water on the snow contained in the funnel and deduct the
quantity poured in from the total amount in the tube.
--Contributed by Thurston Hendrickson, Long Branch, N.J.

** How to Make an Aquarium [64]

In making an aquarium, the first thing to decide on is the size.
It is well not to attempt building a very large one, as the
difficulties increase with the size. A good size is 12 by 12 by 20
in., and this is inexpensive to build.

First buy one length of 3/4 by 1/8-in. angle iron for the frame,
F, Fig. 1. This can be obtained at any steel shop and should cost
about 20 cents. All the horizontal pieces, B, should be beveled 45
degrees at the ends and drilled for 3/16 in. stove bolts. The
beveling may be done by roughing out with a hacksaw and finishing
with a file. After all the pieces are cut and beveled they should
be drilled at the ends for the 3/16-in. stove bolts, C. Drill all
the horizontal pieces, B, first and then mark the holes on the
upright pieces, A, through the holes already drilled, thus making
all the holes coincide. Mark the ends of each piece with a figure
or letter, so that when they are assembled, the same ends will
come together again. The upright pieces, A, should be countersunk
as shown in the detail, and then the frame is ready to assemble.

After the frame has been assembled take it to glazier and have a
bottom made of skylight glass, and sides and ends of double-thick
window glass. The bottom glass should be a good fit, but the sides
and ends should be made slightly shorter to allow the cement, E,
to form a dovetail joint as shown. When the glass is put in the
frame a space, D, will be found between the glass and the
horizontal pieces, B, of the frame. If this were allowed to remain
the pressure of the water would spring the glass and cause a leak
at E; so it is filled up with plaster of paris.

The cement, E, is made as follows: Take 1 gill of plaster of
paris, 1 gill of litharge, 1 gill of fine white sand, and 1/3 of a
gill of finely powdered rosin. Mix well and add boiled linseed oil
and turpentine until as thick as putty. Let

[Illustration: Detail of Aquarium Frame]

the cement dry three or four days before putting any water in the
aquarium.

In choosing stock for the aquarium it should be remembered that a
sufficient quantity of vegetable life is requi