“It was in the month of July, 1743, that my father and my uncles Ruggieri exhibited for the first time at the Theatre de la Comédie Italienne and before the King, the passage of fire from a moving to a fixed piece.
“This ingenious contrivance at first astonished the scientists of the day, who said when it was explained to them that nothing could be more simple and that any one could have done it at once.”
He then explains the method of construction, which is to lead from the back end of one of the turning cases through the hollow centre of the axle to the lighter of the fixed piece situated behind it.
The development of fixed and mechanical pieces was made possible by the introduction of quickmatch.
When this actually took place is uncertain. Frézier describes its making similarly to that in use to-day, under the name of “étoupilles.” Bate uses the word “stouple,” evidently a corruption of the French. He gives no actual description of the making of this, but it appears to be of “cotton weeke” dipped in “aqua vitæ wherein camphire hath been dissolved.” This would produce only a slow-burning match unless it was his intention to use it wet, in which case the burning of the spirits of wine might quicken the effect. It would, however, be quite out of the question to construct a piece of any elaboration with such materials.
Quickmatch is manufactured to-day in the following manner. Cotton wick is run through a pan containing a paste composed of gunpowder and starch. It is wound on a frame six feet in length, dusted with mealed powder and dried. When dry it is cut off the frame and threaded into paper tubes or “pipes” of larger diameter, leaving an air space round the match.
Before threading in the tubes it is known in the trade as “raw match,” and is used for priming and similar uses, and in this state will only burn quite slowly.
Quickmatch is used to connect the units of all pieces. Display cases have a “cap” formed of a few turns of paper pasted on the case at the lighting end. When a piece is fitted up the cases are tied to the cleats provided to receive them on the framework; they are then “lead up.” A length of quickmatch has a small piece cut out of the pipe to allow the fire to flash through, it is then doubled at that point and inserted in the cap, which is gathered in and tied round securely. This is continued round the piece, each case having match entering and leaving the cap, and in some cases a further length connecting one series with another. This leading up of set pieces is work requiring skill and knowledge which is only gained by experience. An amateur at a first attempt might possibly be successful in lighting all the cases on a piece, but he would be very unlikely to produce that instant and symmetrical ignition which denotes the skilled pyrotechnist.
The smaller wheels have turning cases, that is, small rockets to give them motion; these burn through very rapidly, and the continuation of movement is provided for by capping the turning cases at either end and leading them up vent to head in series; the motive power for the larger display pieces is provided by gerbs, which, from the nature of their fire, give more effect than would rocket cases, and have the further advantage of burning longer.
It would not be possible in the present work to give a complete catalogue of the varieties of pieces which have been produced, but the list given by Ruggieri is typical of the whole, and includes many of the smaller compound pieces in use to-day for shop and small display work.
The larger display pieces are generally designed and redesigned season by season by pyrotechnists, and are certainly being elaborated and improved. They, however, fall generally into certain classes in the same way as do those given by Ruggieri. His classification is as follows: