Composition |Composition |Composition |Composition |Composition for a rocket |for a rocket |for a rocket|for a rocket |for a rocket of two pound.|of one pound.|of half a |of four |of one ounce | |pound. |ounces. |and a half. -------------+-------------+------------+-------------+----------- Corrected by | Corrected, |Corrected, | Corrected, | Corrected, M. F***, | eleven |seven ounces| six ounces | one ounce one pound. | ounces. |and a half. | five drams. | five drams. -------------+-------------+------------+-------------+----------- lb. oz.| lb. oz. | lb. oz. | oz. | oz. -------------+-------------+------------+-------------+----------- Pow. 2 0 | 1 0 | 1 4 | 5 | 8 or 9 Saltp. 1 0 | 12 | 12 | 1 | ⅕ Brimst. 5 | 2 | 1 | ¼ | Charc. 4 | | 3 | ½ | ½ or 1 Steel-d. 2 | | 2 | | -------------+-------------+------------+-------------+----------- Height of the|Height of the|Height of |Height of the|Height of mould, nine |mould, eight |the mould, |mould seven |the mould, inches and a |inches and |seven inches|inches. |four inches half. |a half. |and a half. | |and a half. -------------+-------------+--------------------------+----------- Diameter of | Diameter of |Diameter of |Diameter of |Diameter of the mould, | the mould, |the mould, |the mould, |the mould, one in. seven| one inch |one inch |one inch |nine lines. lines. | five lines. |three lin. |two lines. | French names for Sky Rockets. Double | Marquise. | Grosse de |De partement.| Fusie de Marquise. | | partement. | | Caisse. Remarks on the foregoing Tables. In table the first, we find that the compositions for all rockets under one pound are made chiefly of gun-powder and charcoal, which method has been long proved erroneous in many respects: first, that rockets made with such charges will not keep long without spoiling; secondly, that they are very uncertain in performing their proper effect; thirdly, they will carry but a short tail, with a black and smoaky fire. We also find those charges for rockets above one pound, that are composed of saltpetre, brimstone, and charcoal, to be too strong; by which we should imagine that, at the time when they were used, the piercers did not bear the same proportion to the rockets, as those made use of by our present artists; for it is on the size of the cavity in the composition, that the effect of the rocket and proportion of the charge depends: which we shall endeavour to shew hereafter.