LITMIR.BIZ

      What made Green exceptional, quite apart from his flying skills, was his ability as a businessman. He drastically reduced the cost of commercial ballooning by negotiating an agreement with the London Gas Light and Coke Company to purchase coal gas to power his balloons. The concept of using ‘pit-coal’ gas for ballooning was not new, and had been recommended by Tiberius Cavallo in his Aerostation study as long ago as 1785. But it took Victorian technology and enterprise to apply it. The London Gas Company had itself only been founded in 1812, but within five years it had laid nearly thirty miles of gas mains, and a decade later had more than enough capacity to inflate Green’s balloons.

      Green had calculated, using experiments with small models, that household coal gas was about half as effective as hydrogen, but less than a third of the cost. A seventy-thousand-cubic-foot balloon would cost £250 to inflate with hydrogen, but only about £80 with coal gas. It was also much quicker and safer to use, as it was delivered under pressure by the urban gas mains, which also supplied street lamps and public buildings.⁷

      By 1835 Green had made over two hundred ascents, and established himself as the leading professional balloonist in Britain. He had also invented a new piece of balloon technology: the trail rope. This was a simple, self-regulating ballast device, which allowed a gas balloon to adjust its own height when flying at altitudes below five hundred feet. Made of heavy manila cordage, the trail rope was winched out of the basket and simply left to drag along the ground several hundred feet below. Whenever the balloon dropped closer to the ground, more trail rope – and hence more ballast weight – was transferred from the balloon basket to the earth. Thus lightened, the balloon would rise again to a new point of balance. It was a very neat form of homeostatic device, typical of Green’s supremely practical turn of mind. He never attempted to patent it, and it was soon employed by aeronauts across Europe.

      Of course the trail rope could not be used over cities, or any kind of built-up or industrialised area. But apart from London and the sea ports, the cathedral cities of the shires and the manufacturing towns of the Midlands, England was still very largely a rural landscape. So Green employed his trail rope with what now seems amazing insouciance across the whole countryside: dragging it crashing through lines of trees and hedgerows, hissing across fields of crops or cattle, and not infrequently lifting the odd tile or slab of stonework from church roofs or isolated barns. This was a land still without barbed wire, let alone telegraph lines or electrical pylons, and the trail rope suggests a lost age of open parklands, isolated villages and largely unpopulated countryside.^fn12 If he descended on a gentleman’s estate, Green could expect immediate help from the estate labourers, and usually a warm welcome and much hospitality from the squire at the great house. The balloon was in its own way an old-fashioned expression of pastoral values and pleasures.

      But it was also a commercial proposition. In 1836 Green negotiated an agreement with Frederick Gye and Richard Hughes, proprietors of the immensely popular Vauxhall Pleasure Gardens, on the banks of the Thames, to supply balloon events as part of the garden’s attractions to Londoners, alongside brass bands, food stalls and horse-riding. Balloons were also a superb new means of publicity. For the next twenty years Vauxhall became associated with spectacular balloon launches, and various balloon dramas, until it was finally closed in 1859.

      Part of Green’s contract provided him with the finances to construct to his own specification a huge eighty-foot-high coal-gas balloon with a seventy-thousand-cubic-foot capacity. It cost £2,000, an unheard-of sum, and was known initially as the Royal Vauxhall. Its livery was a red-and-white vertical candy stripe, with a Latin inscription from Ovid’s Metamorphoses emblazoned grandly round the circumference: ‘Caelum certe patet, ibimus illi’ – ‘Surely the sky lies open, let us go that way!’^fn13 This was taken as signifying an appropriate pedagogical gesture on the part of Green or the Vauxhall proprietors: balloon travel was not mere entertainment, it would open the mind as well as the skies.