The following table is taken from a late French author[2], whose method of regulating the charges is according to the interior diameter of the mould, which he divides into lines. Interior | Weight of |Saltpetre.|Brimstone.|Charcoal. diameter of|the rocket.| | | the mould. | | | | -----------+-----------+----------+----------+--------- Lines. |lb. oz. dr.| ounces. | ounces. | ounces. -----------+-----------+----------+----------+--------- 6 | 0 0 4 } | | 7 | 0 0 6 } 44 | 4 | 16 8 | 0 1 1 } | | | | | | 9 | 0 1 5 } | | 10 | 0 2 2 } 40 | 4 | 16 11 | 0 3 0 } | | | | | | 12 | 0 3 7 } | | 13 | 0 4 6 } 38 | 4 | 16 14 | 0 6 1 } | | | | | | 15 | 0 7 4 } | | 16 | 0 9 1 } 36 | 4 | 16 17 | 0 11 0 } | | | | | | 18 | 0 13 1 } | | 19 | 0 15 4 } 34 | 4 | 16 19¼ | 1 0 0 } | | | | | | 21 | 1 7 1 | | | | | | | 24 | 1 15 1 | 32 | 5 | 16 | | | | 30 | 4 0 0 } | | 36 | 6 9 0 } 30 | 6 | 18 72 | 55 8 0 } | | TAB. III. A table of charges for sky-rockets in which the charges are adapted in proportion to the weight of composition contained in each rocket, after the method of Hanzelet. Weight of | Powder. | Saltpetre. | Brimstone. | Charcoal. composition. | | | | ------------- | ------- | ---------- | ---------- | --------- lb. oz. | lb. oz. | lb. oz. | lb. oz. | lb. oz. ------------- | ------- | ---------- | ---------- | --------- 0 1½ | 0 4 | | | 0 1 or, | 1 0 | 0 1½ | | 0 1½ 0 2 | 0 4 | 0 1 | | or, | 0 4 | | | 0 ½ 0 4 } | 1 0 | 0 4 | | 0 4 0 8 } | | | | or, | 0 3 | 0 10 | 0 1 | 0 3 | 0 10 | 0 3½ | 0 1 | 0 3½