Leonardo (1452-1519) created no more than 17 paintings during his lifetime. This part-time artist, who created the two most famous paintings in the history of art, was a consummate scientist-engineer, imbuing his art with science, and his science with art.
Although he had virtually no formal education, he possessed relentless curiosity, which in combination with his extraordinary skills of observation, defined his unique modus operandi. His Codices, notebooks reminiscent of modern lab books, exude an almost divine quality. First, the drawings are far more beautiful than any ordinary scientist could have created; second, they show the depth and breadth of his understanding; and third, they reveal that he was routinely making discoveries centuries before they would be rediscovered. Five hundred years ago he designed machines to enable a man to walk on water, or to walk around breathing under water; siege engines to wage war, and machines to defend against attackers; portable bridges; machines for human flight; topographic maps; devices to measure humidity and wind speed… and machines that could grind mirrors to focus rays of light. Most likely he made a refracting astronomical telescope 100 years before Galileo, and a reflecting telescope 170 years before Isaac Newton reinvented it. (Among the blogs in National Geographic NewsWatch, please see the 4th in the series, ‘Brief History of the Astronomical Telescope: <a href=” https://newswatch.nationalgeographic.com/2011/07/05/a-brief-history-of-the-astronomical-telescope-iv-did-leonardo-invent-the-astronomical-telescope-100-years-before-galileo/“> A Brief History of the Astronomical Telescope </a>).
The drawing for a machine that had long been thought to be the blueprint of a ‘spring-driven cart’ was recently identified as a design in robotics. Among all the areas of science and technology in which he delved, it was in anatomical studies that he excelled. He produced drawings that have never been equaled in quality.
History’s Most Famous Left-Hander
Leonardo, in writing his thoughts in his notebooks, employed “mirror script,” writing backwards from right-to-left. To read his notes, one has to reflect them in a mirror, or hold up the reverse side against a strong light source. A simple rule of thumb that all sketch artists know instinctively is the direction of shading: a right-hander shades by creating parallel lines with positive slope (bottom left to top right); a left-hander creates parallel lines with negative slope (bottom right to top left, notice the direction of shading in the robotic car). Leonardo was left-handed, and he simply did not want to smudge the freshly laid down ink with the heel of his hand, nor to stab the paper in pushing his quill from left-to-right. He found it much faster to write backwards.
He could, however, write in the conventional manner, from left-to-right. In applying for a job as a military engineer in 1482, he wrote to Ludovico Sforza, the strongman of Milan in the normal direction. The 900-word letter, his CV, identifies eleven types of inventions he has produced, or that he can produce (he changes tense). He describes portable bridges, armed carts designed to deflect light artillery (the tank)… and concludes with “…also I can do in painting whatever needs to be done.” Leonardo claims he can also paint!
In 1499 the French invaded Milan, and took Leonardo’s patron Duke Sforza prisoner. Leonardo, out of a job, took his assistant Salai and mathematician friend Luca Paccioli, and abandoned Milan. Heading east, the small party made its way to Venice. It was there in 1500, it is believed, Leonardo first came into contact with the merchants, trading partners of the Ottoman Turks, and where he first began to ruminate about a job in the Ottoman Court. This time he wrote a letter from right-to-left, in the convention of ‘0ld Turkish’ script (Whether he personally wrote it or hired a Turkish scribe to write it, we shall never know. There is no right- or left-handed shading in the letter, as there is in the drawings.)
Next: Part II. The letter to the Sultan
A little known project even among Leonardisti (scholars and fans of Leonardo) concerns Leonardo’s attempt to secure employment as a military engineer at the Ottoman Court. In the next installment in this series, we discuss a 510-year old letter (discovered only 60 years ago) proposing the construction of a bridge over Istanbul’s Golden Horn.