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Bochard and the Oxyhydrogen Blowpipe

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Bochard and the Oxyhydrogen Blowpipe Bull. t. Ch. 4 (8 11 4. The decomposition and recomposition of water. bblrph f rr r nd rndd t ll h 5. The production and the decomposition of earths. h frthr nfrtn. 6. The formation and the decomposition of alkalis. Ibd., p. 7. Acidification: the formation and decomposition of 4. Ibd., p. 80. acids; the nature of these salts, their differences, etc. h ttl p f th trnltn rd, Elnt f Ch 8. The combination of acids with earths and alkalis. tr nd trl tr. hh rfxd, th hlph f 9. The oxidation and reduction of metals. Chtr, fth Edtn, th t, b hn hn, Srn, 10. The solution of metals by acids. Ednbrh. vl., . h t fr l. , p. x. 11. The formation of the immediate principles of vege- 6. Ibd., p. x. tables by vegetation. Ibd., p. xxv. 12.The several species of fermentation. 8. Ibd., l. , pp. 46. 13. The formation of animal matters by the life of animals. I. Chn, vltn n Sn, rvrd, 8, p. 24. 14. The purefaction and decomposition of animal matters. Each of these is considered briefly, and the relationship of n . Chtn Chrn f th Chtr prtnt t each to the properties of gases is shown. It is a really beautiful Sfrd Unvrt n rnh, A 22 nd ntr summary of the state of chemical knowledge at the time, td n th rt b f htr. expressed in the new system. A fourth edition of Élén was published in 1791, with only a few minor changes; a fifth edition in 1793 was merely BOCHARD DE SARON AND THE a reprint of the fourth. This fifth edition was reprinted in OXYHYDROGEN BLOWPIPE Switzerland in 1798. English translations of each edition had appeared within a year or two of the French publication. There El . Gnzlz, h Mrr hbn Cntr, were also translations into Italian, German, and Spanish. Unvrt f Ch Incidentally, the first publication in America of the new theo- ries came in Philadelphia in 1791 in a pirated edition of the It was Joseph Priestley who first noted in 1775 that a mixed Enlpd rtnn, which reproduced a nomenclature flame of dephlogisticated air (oxygen) and inflammable air table from the English translation of the third edition of (hydrogen) exhibited an unusually high temperature, and who Fourcroy 's Élén. Thus it can be argued that Fourcroy, with first suggested that one might obtain a useful high temperature his large audiences in Paris and his very popular textbook source by directing a stream of oxygen into a hydrogen flame circulated throughout Europe, did more to spread the new by means of a bellows (2, 3). However, the practical construc- nomenclature and the new chemistry than anyone else. All I tion of such a device was first accomplished by the French wish to claim is that it is this third edition, published 200 years scientist, Jean Baptiste Gaspard Bochard de Saron, who was ago last December, which was the "first textbook of the also the first to use an oxyhydrogen torch to successfully fuse revolution". platinum (1). Prior to Bochard's work, scientists wishing to One final word - in Bernard Cohen's marvelous book, work at high temperatures had to rely instead on the use of vltn n Sn, he states that although Bucquet used the burning mirrors and lenses to concentrate the heat of the sun. word "revolution" in referring to Lavoisier's work as early as Attempts at capturing the heat of the sun's rays are appar- 1777, and Lavoisier himself used it in his lab notebook as early ently quite ancient. Myth tells us that Prometheus caught the as 1773, it was Fourcroy, through his textbook and other heat of the sun to light the Vestal Fire and, when the Olympic writings who "was most effective in canonizing the expression Games started, the heat of the sun was used to light the Olympic `the revolution in chemistry'..." (9). flame, as it still is today (4). Likewise, Aristophanes refers, in The third paper in this series will look at the most famous h Cld, to "That stone, that splendidly transparent stone, book of the chemical revolution, Lavoisier's own rté By which they kindle fire?" (5) and Plutarch claims that Éléntr d Ch. Archimedes used burning mirrors to set fire to the fleet of Marcellus in the sea off Syracuse (6). frn nd t Prior to the introduction of gas and Bunsen burners, only coal-burning furnaces, ventilated with bellows, were available . Chtn, "Méthd d nltr Ch", ll. to fuse such materials as metals, minerals, glasses, bones, etc. t. Ch. , 8, , . If one wished to avoid contamination by the combustion 2. Mt f th brphl nfrtn n th ppr fr W. products of burning coal, the only alternative was the use of A. Stn, rr, Cht nd vltnr, 80, burning glasses and mirrors. ffr , Cbrd, 62. h xllnt b l ntn dtld The use of lenses and mirrors as standard laboratory heat 2 ll. t. Ch. 4 (8 sources was already well established by the 17th century (7) discovery of oxygen (or vital air) and its ability to support and descriptions of their use can be found in the writings of combustion resulted in a nurnber of attempts in the 1780's to such scientists as Robert Boyle, Robert Hooke and John employ it to enhance the heating efficiency of conventional Mayow. Even Galileo mentioned them, noting, in passing, that laboratory heat sources. The most common approach was to lead could be "melted instantly by means of a concave mirror direct a stream of oxygen, rather than common air, through a only three hands in diameter" (8). conventional laboratory blowpipe onto a candle or oil flame 17th century burning lenses and mirrors came in all sizes, and, in turn, to direct the resulting oxygen-enhanced flame onto ranging from the hand-held magnifying glass used by Mayow the object to be fused (12). Experiments with devices of this to ignite antimony and sulfur in sealed vessels (9), to the large type, which were in essence a kind of "oxygen blowpipe", were burning mirrors made by Francois De La Villette (1621-1698) made by, among others, the German chemists, Friedrich of Lyon for the use of the Hessen family of Kassel (10). An Ehrmann (1741-1800) (13-14) and Franz Achard (1753-1821) example of a Villette mirror, built around 1670, is still (15), the Swedish chemist, B. R. Geijer (16), and by Lavoisier preserved in the Staatliche Kunstsammlungen in Kassel, himself (17). Lavoisier's interest in high temperature fusion Germany. It has a was, in part, related diameter of 1.5 to his growing real- meters and a focal ization that solids, depth of 3.45 meters liquids and gases and was bought by were actually three Landgraf Wilhelm interconvertable VIII about 1713 in states of matter. Brabant as a gift for Materials were not his father, Landgraf inherently solid, Carl, for use in his liquid or gaseous but, alchemical and met- depending on their allurgical experi- temperatures, only ments. The same relatively so. To museum also houses thoroughly test this two Tschirnhausen assumption required burning mirrors. a high temperature The efficiency of source which could a typical Villette potentially melt even instrument was the most recalcitrant described by Henri An xpl f lr 8th ntr brnn l drbd b vr. counter examples. In Justel in a letter sent his 1782 memoir on to Henry Oldenburg, the Corresponding Secretary of the Royal the subject, entitled "A Method of Greatly Augmenting the Society, on 18 July 1665 (11): Action of Fire and Heat in Chemical Operations", he first summarized the results that had been obtained to date by the W xnd t fft vrl t, n th rnn, t nn, nd n use of burning mirrors and lenses (17): th ftrnn. It l brnd thn t fftvl, ltn nd lfn n bjt th vr f xptn. In r prn t h rt brnn ln f hrnhn hv prvdd ht ltd lvr ( n, ppr ( hrd, br, bt f t rn th n nt h trnr thn th fr f th frn, b hh th ttl, ll bt f tl, hd f ll rn nl ... t ln l hv dvrd tht lr nbr f bd, rrdd nfbl nd bldn tn (hh t trn nt l b ltn, nd t d r fxd, ll ld t th tn f vr trn ht. h trl dn th bn f nl nd t ltd l plhd n bth d ... It b M. d Cnt r nd M. Art th prln frn lhtd ndl vr l, nd th t f d hh t t hv nfrd th trth nd th rt ln f M. rdn, blt fr n nt d prtt ht. h rd f th rrr fr b M. d rnér, ndr th nptn f th Cr d ft ht nh, nd th f t t ft fr nh. h dtr lAd l d Sn, h pltd th prf tht th t ft x nh nd bt t ln th rrr l fnd lt f bn fxd r rfrtr, ttrbtd t rtn bd, t b plhd n th nvx d ... h rrr tlf n fnhd rltv t th dr f fr d. n t tnd t vld t 0 d r. However, despite these successes, Lavoisier was quick to Though burning mirrors and lenses continued to be used as point out that the use of lenses and mirrors was apparently high temperature heat sources throughout the 18th century, the limited, since attempts at increasing their size did not produce ll.
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