lb. oz. lb. oz.
Saltpetre 5 0 Saltpetre 5 0
Brimstone 1 0 Brimstone 2 0
Meal-powder 1-1/2 0 Meal-powder 1 8
Glass-dust 1 0 Glass-dust 1 8

AN ARTIFICIAL EARTHQUAKE.

Mix the following ingredients to a paste, with water; bury it in the
ground, and in a few hours the earth will break open in several
places:

lb. oz.
Sulphur 4 0
Steel-dust 4 0

_Chinese Fountains._

To make a Chinese fountain, you must have a perpendicular piece of
wood, seven feet long, and two inches and a half square. Sixteen
inches from the top, fix on the front a cross piece one inch thick,
and two and a half broad, with the broad side upwards; below this, fix
three more pieces of the same width and thickness, at sixteen inches
from each other; let the bottom rail be five feet long, and the others
of such a length as to allow the fire-pumps to stand in the middle of
the intervals of each other. The pyramid being thus made, fix in the
holes made in the bottom rail five fire-pumps, at equal distances; on
the second rail, place four pumps; on the third, three; on the fourth,
two; and on the top of the post, one; but place them all to incline a
little forward, that, when they throw out the stars, they may not
strike against the cross-rails. Having fixed your fire-pumps, clothe
them with leaders, so that they may all be fired together.

_The Dodecahedron,_

So called because it nearly represents a twelve-sided figure, is made
thus: First have a ball turned out of some hard wood, 14 inches
diameter; divide its surface into 14 equal parts, from which bore
holes one inch and a half diameter, perpendicular to the centre, so
that they may all meet in the middle: then let there be turned in the
inside of each hole a female screw; and to all the holes but one must
be made a round spoke five feet long, with four inches of the screw at
one end to fit the holes; then in the screw-end of all the spokes bore
a hole five inches long, which must be bored slanting, so as to come
out at one side, a little above the screw; from which cut a small
groove along the spoke within six inches of the other end, where make
another hole through to the other side of the spoke. In this end fix a
spindle, on which put a small wheel of three or four sides, each s