To four ounces of gunpowder, add one ounce of charcoal, or to nine ounces of powder, add two ounces of salt-petre.

3. Four ounce Rockets:—

To one pound of gunpowder, add four ounces of salt-petre, and one ounce of charcoal. The composition will be much stronger if in this proportion:—To ten ounces of powder, add three ounces and a-half of salt-petre, and three ounces of charcoal.

4. Five or six ounce Rockets:—

Gunpowder two pound five ounces, salt-petre half-a-pound, sulphur two ounces, charcoal six ounces, and iron-filings two ounces.

5. Seven or eight ounce Rockets:—

Gunpowder seventeen ounces, salt-petre four ounces, sulphur three ounces.

6. Eight to ten ounce Rockets:—

Gunpowder two pounds five ounces, salt-petre eight ounces, sulphur two ounces, charcoal seven ounces, iron-filings three ounces.

7. Ten or twelve ounce Rockets:—