you do glue.

APPARATUS 152.

_277. Battery Jars._ For small cells, use glass tumblers. Ordinary glass
fruit jars are good. Even earthen bowls may be used, and for large
cells--if you have nothing better--you can use small earthen crocks or
jars.

278. Glass Bottles can be cut off so that they will make excellent jars.
If you have thin bottles, you can cut them with strong cord. Tie one end
of the cord, which should be 5 or 6 feet long, to a door knob or to a
solid post. Tie the other end around your body. Make one complete turn
of the cord around the bottle where you wish to cut it; draw the cord
tight by stepping back, and with both hands draw the bottle back and
forth vigorously many times, so that the cord will rub it hard and make
it very hot. Do not let the cord move lengthwise upon the bottle. This
will make a circle around the bottle that is very hot. Immediately
plunge the bottle into cold water, the colder the better. Use ice-water,
if you have it. If you produce heat enough, the bottle should crack all
the way around very neatly. File off any sharp corners and edges with a
wet file.

279. A hot iron can be used with success to cut off a bottle. File a
deep groove first, hold the red-hot iron first on one side of file mark
and then on the other to start the crack. You can lead the crack
wherever you wish by keeping the iron about 1/8 in. ahead of it.

280. A small gas-flame will be much better than a hot iron, and you may
easily use it, if you have glass tubing, rubber tubing, etc., in your
shop. Draw out the glass so that the gas will burn in a fine needle-like
flame about 1 in. long. Keep the point of the flame about 1/4 in. ahead
of the crack. The glass tube should be held in a rubber tube connected
with the gas pipe.

CHAPTER XXI.

TOOLS AND MATERIALS.

_281. Your Workshop._ If possible, keep all your work, tools and
apparatus in one room, and lock the door when you leave.

The work-bench may be made of an old kitchen table, or of a strong,
large box. The tool chest may be made of any clean box about the size of
a soap box. Shelves can be made by setting soap or starch boxes on their
sides, one above the other.

_282. The tools_ needed are generally mentioned in the proper places,
under the directions for construction. It is better to buy your tools as
required, than to buy too many at once, some of which you may not need.
If you have absolutely no tools, not even a saw or hammer, yo