Olinto De Pretto was born on April 26, 1857 in Schio in what is now the province of Vicenza in northern Italy. Olinto was the sixth of seven children. His mother was Angelica Boschetti. His father, Pietro De Pretto, was an architect whose hobbies included astronomy and geology, two studies Olinto would later take up. He attended the Superior School of Agriculture in Milano where he studied agriculture and geology with a major in agronomics. He graduated in 1879 with a degree in agronomics. Immediately upon graduation he became a university assistant to professor :it:Gaetano Cantoni |Gaetano Cantoni, a Dean of the agricultural school. Together they developed methods that helped modernize Italian agriculture by improving methods of crop rotation and analyzing soil chemistry. When Cantoni died in 1887, Olinto left the university and became a director at a mechanical foundry mill owned by his older brother Silvio, where he worked for the rest of his life.
Early scientific research and papers
In 1888, as a result of his research with his brother Augusto, he published his first paper, "The Influence of the Raising and the Degradation of Mountains on the Development of Glaciers". In 1892, along with his brothers Augusto and Silvio they founded the Alpinistic Circle with Silvio as the first president. In 1896 the Bulletin of the Italian Society of Geology republished his article as "The Degradation of Mountains and Its Influence on Glaciers". In 1898, his paper titled "Glacial Epoch and Orografical Theory" was published in the Bulletin of the Italian Alpine Club. In 1899, he published "Geological Signs in the Surroundings of Schio".
Contributions to physics and energy–mass-equivalence
From 1899 to 1903 De Pretto began to study the emerging field of nuclear physics and its relationship to astronomy. He focused on the theory ofaether, a hypothetical substance that at that time was believed to fill all space. As a result of his research on November 29, 1903, De Pretto published a 62-page paper in the Atti del Reale Istituto Veneto di Scienze, Lettere ed Arti, vol LXIII entitled "Ipotesi dell'Etere nella Vita dell'Universo". The paper was endorsed by the famous astronomer Giovanni Schiaparelli. De Pretto's paper was later included in the proceedings of an Italian scientific institute The Royal Veneto Institute of Science. This theory was similar to Samuel Tolver Preston's 1875 hypothesis that matter and energy might be interchangeable. De Pretto's theory was based on his hypothesis that a mass traveling at velocity v has the potential energy proportional to mv2. In the section of his paper headed Energy of the Ether and Potential Energy in Matter, De Pretto wrote: By theorizing "vibration of the ether", De Pretto asserted that mass is vibrating energy and that mass and energy are therefore interchangeable. He then speculated that ordinary matter may be considered to be vibrating at the speed of lightc. According to De Pretto,
½mv² versus mc²
De Pretto used the expression for the "vis viva" and the energy store within matter, where he identified v with the speed of light. His formula precedes by two years, and is in agreement with Albert Einstein's later formula for mass–energy equivalence, which was derived by Einstein as a consequence of special relativity.
Radioactive decay
De Pretto's paper discussed the radioactive decay of uranium and thorium and was the first to conclude that this decay was energy transformation from mass into energy. He also presented a hypothesis that the intense heat assumed to be in the center of the Earth was caused by the tremendous mass of the earth creating a massive radioactive core giving off heat and energy.
