• 1852 December 28
    (b.) -
    1936 December 18


A Spanish civil engineer and mathematician of the late nineteenth and early twentieth centuries, he was born in Santa Cruz de Igu?a, Molledo (Cantabria), Spain. The family resided for the most part in Bilbao, where Leonardo's father worked as a railway engineer; although they also spent long periods in his mother's family home in the Cantabrian Mountain. In Bilbao he studied to enter an advanced high school program and later spent two years in Paris to complete his studies. In 1870, his father was transferred, bringing his family to Madrid. The same year, he began his higher studies in the Official School of the Road Engineers' Corps. He temporarily suspended his studies in 1873 to volunteer for the defense of Bilbao, which had been surrounded by Carlist troops during the Third Carlist War. Returning to Madrid, he completed his studies in 1876, fourth in his graduating class. He began his career with the same train company for which his father had worked, but he immediately set out on a long trip through Europe to get to know the scientific and technical advances of the day firsthand, especially in the incipient area of electricity. Upon returning to Spain, he took up residence in Santander where he financed his own work and began a regimen of study and investigation that he never abandoned. The fruit of these investigations appeared in his first scientific work in 1893. He married in 1885 and had eight children. In 1899 he moved to Madrid and became involved in that city's cultural life. From the work he carried out in these years, the Athen?um of Madrid created the Laboratory of Applied Mechanics of which he was named Director. The Laboratory dedicated itself to the manufacture of scientific instruments. That same year, he entered the Royal Academy of Exact, Physical and Natural Sciences in Madrid, of which entity he was President in 1910. Among the works of the Laboratory, the cinematography of Gonzalo Bra?as and the X-ray spectrograph of Cabrera and Costa are notable. In the early 1900s, he learned the international language Esperanto, and was an advocate of the language throughout his life. In 1916 King Alfonso XIII bestowed the Echegaray Medal upon him; in 1918, he declined the offer of the position of Minister of Development. In 1920, he entered the Royal Spanish Academy, in the seat that had been occupied by Benito P?rez Gald?s, and became a member of the department of Mechanics of the Paris Academy of Science. In 1922 the Sorbonne named him an Honorary Doctor and, in 1927, he was named one of the twelve associated members of the Academy. Among other pursuits, in early 1910, he began to construct a chess automaton he dubbed El Ajedrecista (The Chessplayer) that was able to automatically play a king and rook endgame against king from any position, without any human intervention. This device was first publicly demonstrated in Paris in 1914, and is considered the world's first computer game. Mechanical arms moved the pieces in the prototype, but by 1920, electromagnets under the board were employed for this task. In 1903, he presented the Telekino at the Paris Academy of Science, accompanied by a brief, and making an experimental demonstration. In the same year, he obtained a patent in France, Spain, Great Britain, and the United States. The Telekino consisted of a robot that executed commands transmitted by electromagnetic waves. It constituted the world's second publicly demonstrated apparatus for radio control, after Nikola Tesla's Patented "Teleautomaton", and was a pioneer in the field of remote control. In 1906, in the presence of the king and before a great crowd, he successfully demonstrated the invention in the port of Bilbao, guiding a boat from the shore. Later, he would try to apply the Telekino to projectiles and torpedoes, but had to abandon the project for lack of financing. In 2007, the prestigious Institute of Electrical and Electronics Engineers (IEEE) dedicated a Milestone in Electrical Engineering and Computing to the Telekino, based on the research work developed at Technical University of Madrid by Prof. Antonio P?rez Yuste, who was the driving force behind the Milestone nomination. Analogue calculating machines seek solutions to equations by translating them into physical phenomena. Numbers are represented by physical magnitudes such as may be done with certain rotational axes, potentials, electrical or electromagnetic states, and so on. A mathematical process is thereby transformed by these machines into an operative process of certain physical magnitudes which leads to a physical result corresponding with the sought mathematical solution. The mathematical problem therefore is solved by a physical model of itself. From the mid 19th century, various such mechanical devices were known, including integrators, multipliers, and so on, to say nothing of Charles Babbage's analytical machine. It is against this background that his work is defined. He began with a presentation in 1893 at the Academy of Exact, Physical and Natural Sciences of the Memory on algebraic machines. In his time, this was considered an extraordinary success for Spanish scientific production. In 1895 the machines were presented at a congress in Bordeaux. Later on, in 1900, la Memoria would present the calculating machines at the Paris Academy of Sciences. These machines examined mathematical and physical analogies that underlay analogue calculation or continuous quantities, and how to establish mechanically the relationships between them, expressed in mathematical formulae. The study included complex variables and used the logarithmic scale. From a practical standpoint, it showed that mechanisms such as turning disks could be used endlessly with precision, so that variables' variations were limited in both directions. On the practical side, he built a whole series of analogue calculating machines, all mechanical. These machines used certain elements known as arithmophores which consisted of a moving part and an index that made it possible to read the quantity according to the position shown thereon. The aforesaid moving part was a graduated disk or a drum turning on an axis. The angular movements were proportional to the logarithms of the magnitudes to be represented. Using a number of such elements, he developed a machine that could solve algebraic equations, even one with eight terms, finding the roots, including the complex ones, with a precision down to thousandths. One part of this machine, called an "endless spindle" ("fusee sans fin") and consisting of great mechanical complexity, allowed the mechanical expression of the relation y=log(10^x+1), with the aim of extracting the logarithm of a sum as a sum of logarithms, the same technique which is the basis of the modern electronic Logarithmic Number System. Since an analogical machine was being used, the variable could be of any value (not only discrete prefixed values). With a polynomial equation, the wheels representing the unknown spin round, and the result gives the values of the sum of the variables. When this sum coincides with the value of the second member, the wheel of the unknown shows a root. With the intention of demonstrating them, he also built a machine for solving a second-grade equation with complex coefficients, and an integrator. Nowadays, this machine is kept in the museum at the ETS de Ingenieros de Caminos of the Technical University of Madrid (UPM).
  • Date of Birth:

    1852 December 28
  • Date of Death:

    1936 December 18
  • Gender:

  • Noted For:

    Developed the Telekino which consisted of a robot that executed commands transmitted by electromagnetic waves - a pioneer in the field of remote control
  • Category of Achievement:

  • More Info: