Ballistite

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Ballistite is a smokeless propellant made from two high explosives, nitrocellulose and nitroglycerine. It was developed and patented by Alfred Nobel in the late 19th century.

Alfred Nobel patented^[1] Ballistite in 1887 while he was living in Paris. His formulation was composed of 10% camphor and equal parts nitroglycerine and collodion.^[2] The camphor reacted with any acidic products of the chemical breakdown of the two explosives. This both stabilized the explosive against further decomposition and prevented spontaneous explosions. However, camphor tends to evaporate over time, leaving a potentially unstable mixture.^[3]

Nobel's patent specified that the nitrocellulose should be "of the well-known soluble kind". He offered to sell the rights of the new explosive to the French government, but they declined. Modern research shows that Vieille already discovered it in 1884-1885, about the same time as his Poudre B, and noted its high flame temperatures leading to bore erosion. This led the French military to conclude it was unsuitable for military use (indeed, it was a problem for all the militaries which tried to use double- base propellants later).^[4] Nobel subsequently licensed the rights to the Italian government, which entered into a contract on 1 August 1889 to obtain 300,000 kg (660,000 lb) of Ballistite; and Nobel opened a factory at Avigliana, Turin.^[5]

The Italian Army swiftly replaced their M1870 and M1870/87 rifles, which used black powder cartridges, by the new M1890 Vetterli, which used ballistite cartridges. As Italy was a competing great power to France, this was not received well by the French press and the public. The newspapers accused Nobel of industrial espionage, by spying on Paul Vieille (the inventor of Poudre B), and "high treason against France". Following a police investigation, he was refused permission to conduct any more research, or to manufacture explosives in France. He therefore moved to San Remo in Italy, in 1891, where he spent the last five years of his life.^[6]

Rifle grenades such as the ENERGA^[7] and Spigot mortar rounds used in the PIAT^[8] used Ballistite.^[9][10][11]

Ballistite is still manufactured as a solid fuel rocket propellant, although the less volatile but chemically similar diphenylamine is used instead of camphor.^[12]

Meanwhile, a government committee in Great Britain, called the "Explosives Committee" and chaired by Sir Frederick Abel, monitored foreign developments in explosives. Abel and Sir James Dewar, who was also on the committee, jointly patented a modified form of ballistite in 1889. This consisted of 58% nitroglycerin by weight, 37% guncotton and 5% petroleum jelly. Using acetone as a solvent, it was extruded as spaghetti-like rods initially called "cord powder" or "the committee's modification of ballistite", but this was soon abbreviated to cordite.

After unsuccessful negotiations, in 1893, Nobel sued Abel and Dewar over patent infringement and lost the case.^[13] It then went to the Court of Appeal and the House of Lords in 1895 where he also lost the two appeals and the Nobel's Explosives Company had to pay the costs.^[13] The claim was lost because the words "of the well-known soluble kind" in his patent were taken to mean soluble collodion, and to specifically exclude the ether-alcohol-insoluble guncotton.^[13]

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