ont will be most suitable. Half-pound cases, filled ten
inches with composition, will be a good size for a sun of five feet
diameter; but, if larger, the cases must be greater in proportion.

DETONATING WORKS.

WATERLOO CRACKERS.

Take a slip of cartridge-paper, about three-quarters of an inch in
width, paste and double it; let it remain till dry, and cut it into
two equal parts in length, (No. 1 and 2,) according to the following
pattern:

+-----------------+---+-------+--------+
| No. 1. Glass. | S | Glass.| No. 2. |
+-----------------+---+-------+--------+

Take some of the glass composition, and lay it across the paper as in
the pattern, and put about a quarter of a grain of fulminating silver
in the place marked S, and while the glass composition is moist, put
the paper marked No. 2, over the farthest row of glass. Over all,
paste twice over the part that covers the silver a piece of paper; let
it dry, and when you wish to explode it, take hold of the two ends and
pull them sharply from each other, and it will produce a loud report.

DETONATING GIRDLE.

Procure a piece of girth from 12 to 18 inches in length. Double it,
and fold it down about 1-1/2 inch, similar to the fold of a letter,
and then turn back one end of the girth, and it will form two
compartments. Then take some gum and dissolve it in water; boil it
till it is quite melted, and very thick; add coarse powdered glass,
sufficient to make it into a very thick paste; place two upright rows
of the glass composition in the inside of one of the folds, about as
wide as the thickness of a lath, and as high as a half-crown laid
flat; and when they are dry, sew the first fold together on the edge,
and then the second at the opposite end, so that one end may be open.
Then, in the centre of the two rows, put about a grain of fulminating
silver, and paste a piece of cotton or silk over it. Make a hole at
each end of the girdle, and hang it to a hook in the door-post, and
the other hook on the door, observing to place the silk part so that
it may come against the edge of the door when opened, which will cause
a report as loud as a small cannon. The fulminating silver may be
purchased at any of the operating chemists.

DETONATING BALLS.

Procure some glass globes, between the size of a pea and a small
marble, in which there must be a small hole; put into it half a grain
of fulminating silver. Paste a piece of paper carefully over the ball
to