Blackwood's Edinburgh Magazine, Volume 59, No. 368, June 1846

Schwartz, the monk of Cologne, probably had a real existence, probably had something to do with the progress of pyrotechnic art; it is even more probable that he invented gunpowder than that the public invented him. The very accident which is reported to have happened, it is not altogether improbable did happen; but if a mixture of saltpetre, sulphur, and charcoal accidentally exploded, it was not accident which brought together those particular three ingredients out of the whole laboratory of nature and art.

It is indeed possible that the frequency of accidental explosions when gunpowder was known, were reflected back as a plausible hypothesis to account for its invention; but as the explosive power and utility of gunpowder were not facts which could have been arrived at by a priori reasoning, there is every likelihood of such an accident having originally suggested the application of an explosive mixture as a means of propulsion. The history of the invention then resolves itself into the question, Were any admixtures of these three ingredients previously known, what led to them, and what were the objects proposed by them? This question is attempted to be answered by the book before us, containing a very erudite inquiry into the progress of the invention of Greek fire and gunpowder, which are, according to the author's view, modifications of the same thing, i. e. pyrotechnic compositions, differing only or mainly in the proportions or purity of their ingredients. A mass of very curious information is given to the reader, which, in addition to the general stock of knowledge or obscure tradition on this subject, shows a gradual and generally diffused use of sulphur, saltpetre, and charcoal in different proportions, and occasionally mixed with other combustible substances. Among the Arabs of the thirteenth century a vast number of receipts for such mixtures existed; this is proved by some ancient Arabic MSS. preserved in the Bibliothèque Royale. How the Arabs got possession of these arts is left somewhat in obscurity, though our authors consider there are strong grounds for conjecturing that they obtained then originally from the Chinese about the ninth century; that they then proceeded slowly in improving this knowledge for the three centuries during which they had no intercourse with the Chinese; and that they again acquired further information on these points after the Mongul irruption in the thirteenth century.

The defect of the book before us is its inconclusiveness: from the preface we are led to expect the solution of a theorem; after reading the book through, we find ourselves not indeed as far at sea as ever, but aided mainly by negations. The actual origin of gunpowder or Greek fire is not traced; many of the connecting links in the chain of pyrotechnic discovery are still deficient; and the conjectures, which stand in the place of conclusions, are frequently founded upon what appear to us insufficient data. On the other hand it must be admitted, that on a subject so involved in obscurity, inasmuch as proof is impossible, speculation is to a certain extent admissible as a link to render isolated facts intelligible.

It may be well here if, before passing to the more immediate object of this paper – viz. a sketch of the probable progress of pyrotechny – we explain to those of our readers who are unacquainted with chemistry, the philosophy of explosive combustibles.

Combustion is nothing else than rapid chemical union, taking place between two dissimilar substances, which have what is called an affinity for each other, i. e. a tendency to unite and form a new compound. When a candle or lamp is burned, it is carbon and hydrogen, the principal constituents of oil or fat, which combine with oxygen, one main ingredient of the atmosphere. As it requires a certain temperature for this union to take place, to prevent the cooling effect of mass, a wick is used which can be readily heated, and where, as soon as chemical action has once taken place, other portions of the oil or melted tallow are absorbed, which ascend just as water through the pores of a sponge, and supply the place of those burned. In this example, only a small ignited surface is exposed to the influence of the oxygen: if, however, this latter element could be obtained in a solid state, and mixed up with the combustible, each particle throughout the whole mass would have in contact with it a particle of oxygen; so that, if the whole were raised to the necessary temperature for combustion, combustion would be instantaneous – or if the temperature of a part were sufficiently elevated, the combustion of this portion would communicate an intense heat to the contiguous portions, and the whole would rapidly kindle as a fuse does. In this case also, the access of the air being immaterial, combustion might take place in a closed vessel, or even under water.

Nitre, or saltpetre, is one of a class of substances which contains a large portion of oxygen in a combined and solid state; and, being mixed with combustible matter such as charcoal, it causes rapid deflagration when the temperature is raised. The whole class of pyrotechnic compositions are reducible to this simple principle – they all consist of combustible substances intimately mixed with substances containing oxygen; or, to reduce the proposition to more general and simple terms, they consist of two or more substances, having for each other a powerful chemical affinity, and capable of rapidly uniting when the temperature is elevated. When a projectile force is necessary, a further condition is essential, viz., that they liberate by their chemical action gaseous matter, whereby a sudden increase in volume is produced, the expansion of which, augmented by the high temperature, produces the required effect of propulsion.

This slight sketch will show that the purity and proportions of the saltpetre, and the inflammable substances mixed with it, are the main elements to be attended to in the improvement of self-burning compositions: it is indeed far from improbable, that the substances used in purifying saltpetre have first suggested such compounds. Wood ashes were used at a very early period for purifying nitre; and at the end of an Arabic receipt of the thirteenth century, for the preparation of saltpetre, in which charcoal is used, is the expression, "guard against sparks of fire."

The probabilities strongly favour the view, that incendiary compositions of the nature we have been describing originated with the Chinese. China snow, and China salt, are the names given by writers of the greatest antiquity to saltpetre. In the Arabic MSS. to which we shall presently allude, the words Chinese wheel, Chinese flower, Chinese dart, occur as appellatives of different fireworks. It is very possible that the influx of Chinese literature, which the result of the recent war with that people promises us, will lead to the discovery of Chinese treatises upon pyrotechny.

Other authors speak of fire-arms among the Chinese at a very early period of our era, and even before Christ; but the interpretation which they have put upon obscure passages – interpretations evidently derived from their existing knowledge – makes these expressions and translations of extremely doubtful import.

At a later period, however, we have the authority of Raschideddin, (minister of the Tartar Khan of Persia,) and of Marco Polo, that the machines of war employed at the siege of Siang Yang were constructed by Arabian or European workmen, and that the Tartars were not at this period themselves able to manufacture such machines. This would tend to negative the belief which has been entertained by some, that the Chinese then used gunpowder as a means of projection, but does not lessen the possibility that the fuses and compositions projected by these machines were of Chinese origin.

In the history of the dynasty of Sang, A.D. 1259, there is a distinct account of a projectile by means of fire as follows: – "In the first year of the period Khaiking, a kind of arms was manufactured called Tho-ho-tsiary, that is to say, 'impetuous fire-lance.' A nest of grains was introduced into a long tube of bamboo, to which fire was set. A violent flame darted forth, and instantly the nest of grains was projected with a noise similar to that of a peacock, which was heard at a distance of about 150 paces."

Upon the whole, it would appear that the Chinese, although the character of their claims to the knowledge of gunpowder has been exaggerated, were in all probability the people among whom mixtures of combustibles with oxygenated substances originated; and this will form one of the many interesting fields of inquiry to be pursued by those skilled in the literature of the Chinese, now that the field is so largely opened to them.

There are obscure passages in writers of a very early period, which speak of thunderbolts being shot from the walls of besieged towns upon the enemy. Philostratus speaks of such; but the indefinite character of these expressions makes their connexion with either Greek fire or gunpowder extremely doubtful.

In the year 883, Nicetas, admiral of the Eastern empire, was sent by the Saracens of Crete to assault Constantinople, and is stated to have burned twenty of their ships with Greek fire.

One of the earliest accounts of its composition is that given by Anna Comnena, who states it was composed of sulphur, bitumen, and naphtha; but the most distinct early receipt for a composition analogous to gunpowder, is that contained in the celebrated book of Marcus Græcus. In the book called Liber Ignium, we have the following receipts: —

"Note. That the fire capable of flying in the air is of twofold composition, of which the first is: One part of colophon and an equal part of sulphur, two parts of saltpetre, and well pulverized, to be dissolved in linseed or laurel oil. A case, or hollowed wood, is then to be charged with it, and ignited. It will fly suddenly to whatever place you wish, and burn up every thing by its fire."

The second sort of flying fire is prepared in this manner: —

"One pound of sulphur vivum, two pounds of charcoal of linden wood or of willow, six pounds of saltpetre, which three things are minutely pounded in a marble mortar. After that you will charge with it a sheath suitable for flying, or for making thunder.

"Note. The sheath for flying ought to be slender and long, and filled with the aforesaid powder well rammed.

"The sheath for making thunder ought to be short and large, and half filled with the aforesaid powder, and well bound in every direction with an iron band.

"Note. That in every sheath a small aperture is to be made, in order that it may be ignited by the match when applied, which match is made slender at the extremities, but in the middle large and filled with the aforesaid powder."

Another receipt of Marcus for Greek fire is as follows: —

"Greek fire is made in the following manner. Take pure sulphur, tartar, sarcocole, (a kind of resin,) pitch, fused saltpetre, and oil of petroleum. Boil them well together. Dip tow in the mixture, and set fire to it. This fire cannot be extinguished but with vinegar or sand."

The close analogy, or rather the identity, of these compositions with gunpowder as at present made, requires no comment. The more important question is the date at which this work was written. This is a matter of great doubt. Messrs Reinaud and Favé, from the fact that the receipt for the preparation of saltpetre to be found in this same book of Marcus is much more imperfect than that in the Arabian MSS., place the date of his book earlier than the thirteenth century. Again, Geber, an oriental writer, the date of whose life is doubtful, but whom our authors fix at the eighth century, has described the preparation of a salt which has been translated nitre, but which our authors consider to have been a sesqui-carbonate of soda, natron, not nitrum. They thence conclude that nitre was unknown to Geber, and thus, because it was known to Marcus, that he lived subsequently; and for this reason they place Marcus between the ninth and twelfth century.

We have seldom seen an instance of more loose deduction than this. It is required to find the date of Marcus. Geber, whose date is unknown, is set down, upon rather weak data, as of the eighth century. Geber's translator is corrected to prove that Geber did not know saltpetre. Hassan Alrammah, an Arabian, is considered as more recent than Marcus, a Greek, because his process for saltpetre is somewhat more perfect; and from the cumulative effect of these data, each of which is very insufficiently established, and which, if established, only go to prove differences in the degrees of perfection of their respective receipts, the date of Marcus is fixed: this certainly is pushing incertum per incertius very far. We fear that if no more accurate information be brought to bear on it, the epoch of Marcus Græcus will be a subject of as much controversy as ever.

The paragraph in the treatises De Mirabilibus of Albert the Great is so identical with that of Marcus Græcus, that there can be no doubt of its being copied from it, or derived from the same source, and is a strong additional instance of the general progress of inventions. A received publication calls attention to a fact already disclosed but forgotten, the knowledge acquired by the world since is brought to bear on the old fact; and a consequent improvement results.

Roger Bacon, to whom the invention or knowledge of gunpowder has been attributed by some, would stand a very poor chance among the men of science of the present day: it is not now the man who conjectures a possibility, but he who demonstrates a fact, that is hailed as the discoverer.

The following series of possibilities are curiously interesting, both from their partial subsequent realization, and from the simple credulity with which Bacon gives us that which he had known "a wise man explicitly excogitate."

"Instruments of navigation can be made, men being the propelling agents, that the largest river and sea barks can be borne along (one man only managing them) with greater speed than if they were full of navigators. Carriages can also be constructed which may be moved without animals, with an inestimable impetus; so that one would think that they were the armed chariots with which they fought in ancient times. Instruments for flying can also be made, so that a man sitting in the centre of the machine, and turning an engine, by which artificial wings may strike the air in the manner of a bird flying. An instrument also can be made, small in magnitude, for elevating and lowering almost infinite weights, than which nothing is more useful in mischances, for by an instrument of the length of three fingers, and of the same breadth or less, a man may extract himself and companions from all danger of prison, and elevate and lower them. An instrument can also be made by which one man may draw to himself a thousand men, by force and against their will. Instruments for walking on the sea can also be made, and in rivers to the bottom without corporal peril. For Alexander the Great used them that he might see the secrets of the sea, according to the relation of Ethicus the astronomer.

"These things, indeed, are of antiquity and of our times, and are certain, except the instrument for flying, which I have not seen, nor have I known a man who has, but I know a wise man who has explicitly excogitated it; and an infinity of other things can be made, as bridges over rivers, can be made without columns or any support, and machines or unheard of engines."

The ultra admirer of the ancients will see in this, if not an accurate relation of facts, which with the exception of the flying it purports to be, at least a wonderful perception of practicabilities; and railroads, diving-bells, suspension-bridges, &c., will be so many circumstantial corroborations of the correctness of his view. We, however, are rather disposed to regard them as ingenious extravagances. Predictions of the success of science are always on the safe side. If in the present day one were to say, that we shall be able to see the inhabitants of Jupiter, or even converse with them, it would be a prophecy which could never be negatived, which might be the case if we said such things were impossible.

Bacon's obscure intimations of gunpowder are not so clearly derived from the same source as the receipts of Marcus Græcus and Albertus Magnus are; but they are apparently derivatives from what was then known to a few, of nitre compositions, and are very analogous, though not quite so extravagant as some of his other deductions.

Bacon also speaks of a child's toy (ludicrum puerile) which was made with saltpetre, the explosion of which produced a report, "quod fortis tonitrui sentiatur excedere rugitum."

As with this, so with the greater number of Bacon's observations; they bear reference to facts, or relations received as facts, which were at that time either generally or partially known, and do not profess to give to the world his own inventions, though the theories deduced from those asserted facts are frequently the produce of his own imaginative brain. Upon the whole, we are fully disposed to agree with Messrs Reinaud and Favé, that the invention of gunpowder is by no means due to Bacon.

We now pass to the Arabian manuscripts of the 13th century, to which we have before alluded, and which constitute the principal discovery of our authors. The same word (baraud) which is now used by the Arabs as signifying gunpowder, was originally used to signify saltpetre; and even in this application had a secondary meaning, its more primitive meaning being "hail." The whiteness and crystalline form of saltpetre presented a sufficient analogy to attach to it a similar name, neology being in those days not quite so common or so easy as at present.

Various salts were also included under the same name, their specific differences not being then known. This fact had probably much influence in retarding the pyrotechnic art, as accurate means of testing the purity and chemical character of the salt were not distinctly understood. A receipt successful in one case, because a proper salt was used, failed in another, because the salt was totally unfit for supporting combustion, though passing under the same name.

In these MSS. occur a vast number of receipts for pyrotechnic compositions, of which we may here give one or two as specimens, and as instances of the close approach made at that time to the composition of gunpowder as manufactured at the present day: —

Proportions of the Sun's Rays.

1st Composition

Saltpetre, 10 – Sulphur, 1⅛ – Charcoal, 2¼

2nd Composition

Saltpetre, 10 – Sulphur, 1⅞ – Charcoal, 2

Proportions of the Garland of Golden Flowers

Saltpetre, 10 – Sulphur, 1 – Steel filings, ½ – Bronze filings, ½

Flashing Rocket

Saltpetre, 10 – Sulphur, 1⅜ – Charcoal, 2⅛

Each substance to be separately pounded; the charcoal and saltpetre are then mixed, and gently pounded; moisten with spittle, and then add the sulphur.

White Rocket without sparks

Saltpetre, 10 – Sulphur, 1¼ – Charcoal, 2¼

To be mixed as before directed