The Lighthouse Stevensons - Bella Bathurst [15]
Even when the fire was maintained, one light was hardly satisfactory for all Scotland. As the Isle of May proved, coal lights were inefficient, gobbled fuel and expired just when they were most needed, in gales or heavy rain. They required constant supervision, were usually clogged by smoke and could easily be mistaken for fires inland. Thomas was evidently going to have to start from scratch, devising new buildings, new fuels and new solutions if he was to succeed in improving the current situation. But if lighthouses came without templates, so too did their architects. There was, as yet, no such thing as an archetypal engineer, let alone a civil or marine specialist. The qualifications and bureaucracy of the modern profession did not exist 200 years ago. When Samuel Johnson published his famous Dictionary in 1755, he described an engineer as ‘an officer in the army or fortified place, whose business is to inspect attacks, defences, works’. As Louis later pointed out, ‘the engineer of today is confronted with a library of acquired results; tables, and formulae to the value of folios-full have been calculated and recorded; and the student finds everywhere in front of him the footprints of the pioneers. In the eighteenth century the field was unexplored; the engineer must read with his own eyes the face of nature; he arose a volunteer, from the workshop or the mill, to undertake works which were at once inventions and adventures. ’ If he was to design, build, supervise, and maintain each of the NLB’s new lights, Thomas therefore needed to become an inventor in his own right. Much of his work was without precedent, and where tested methods did not already exist, Thomas had to improvise as best he could.
Trudging around the rim of Scotland, he soon realised that his new role entailed far more than merely fitting reflectors. Initially, he used the English lighthouses as his template, but was forced almost immediately to adapt to Scotland’s particular rigours. Most English lights of the time were built safely inland out of dependable local stone. Any building on the stormy coast of Scotland needed to withstand all that the elements could hurl at it; a lighthouse, with its flimsy glass and curlicues of ironwork, required a particular kind of strength. The first four lights were, according to Robert Stevenson, ‘on the smallest, plainest and most simple plan that could be devised, and with such materials as could be easily transported and most speedily erected’. All were built of unembellished stone, with walls thick enough to resist the strongest assaults of water or wind, and with plain lanterns bound with a tight corsetry of metal stanchions. The light at Kinnaird Head was adapted from an old fortified tower, and did just as well withstanding the elements as it had done withstanding invasion.
Despite the economy of the designs, Thomas soon discovered that his workload doubled. His assistants were untrained and his experience was suited more to the refinements of New Town ironwork than it was to designing weather-beaten coastal buildings. Two of the four planned lighthouses were on remote islands, which meant long, dangerous sea journeys and difficulties with supervision. Even on the Mull of Kintyre, which was at least on the mainland, materials could not be landed on the coast and therefore had to be carried over twelve miles of stark moorland to the site. Every slate, every block of stone, every fragment of lens and gallon of fuel, had to be taken on horseback and even then the journey was considered so difficult that only one trip could be made each day. Moreover, many of the materials for the lighthouses were new and untried. It was difficult for instance to manufacture glass large and strong enough for the storm-stressed lanterns, since reinforced glass had not yet been invented and metal supports