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.
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