Ernest Rutherford, 1st Baron Rutherford of Nelson OM, FRS (30 August 1871 – 19 October 1937) was a New Zealand-born British chemist and physicist who became known as the father of nuclear physics. In early work he discovered the concept of radioactive half-life, proved that radioactivity involved the transmutation of one chemical element to another, and also differentiated and named alpha and beta radiation. This work was done at McGill University in Canada. It is the basis for the Nobel Prize in Chemistry he was awarded in 1908 “for his investigations into the disintegration of the elements, and the chemistry of radioactive substances”.

Rutherford performed his most famous work after he had moved to the UK in 1907 and was already a Nobel laureate. In 1911, he theorized that atoms have their positive charge concentrated in a very small nucleus, and thereby pioneered the Rutherford model of the atom, through his discovery and interpretation of Rutherford scattering in his gold foil experiment. He is widely credited with first “splitting the atom” in 1917 in a nuclear reaction between nitrogen and alpha particles, in which he also discovered (and named) the proton. This led to the first experiment to split the nucleus in a fully controlled manner, performed by two students working under his direction, John Cockcroft and Ernest Walton, in 1932. After his death in 1937, he was honoured by being interred with the greatest scientists of the United Kingdom, near Sir Isaac Newton‘s tomb in Westminster Abbey. The chemical element rutherfordium (element 104) was named for him in 1997.

–from Wikipedia 2011

Paul Bert (17 October 1833 – 11 November 1886) was a French zoologist, physiologist and politician. He is sometimes given the sobriquet “Father of Aviation Medicine”.

He was more distinguished as a man of science than as a politician or administrator. His classical work, La Pression barometrique (1878), embodies researches that gained him the biennial prize of 20,000 francs from the Academy of Sciences in 1875, and is a comprehensive investigation on the physiological effects of air-pressure, both above and below the normal.(1) Central nervous system oxygen toxicity was first described in this publication and is sometimes referred to as the “Paul Bert effect”.(1, 2) He showed that oxygen was toxic to insects, arachnids, myriapods, molluscs, earthworms, fungi, germinating seeds, birds, and other animals.

1. Bert, Paul (1943) [First published in French in 1878]. Barometric pressure: Researches in Experimental Physiology. Columbus, OH: College Book Company. Translated by: Hitchcock, Mary Alice; Hitchcock, Fred A.

2. Acott, Chris (1999). “Oxygen toxicity: A brief history of oxygen in diving“. South Pacific Underwater Medicine Society Journal 29 (3): 150–5. ISSN 0813-1988. OCLC 16986801.

–From Wikipedia

On this date in history, diver Roderick Cameron was injured during salvage operations of the HMS Royal George  (1841) and Chuck Yeager broke the sound barrier in the Bell X-1.

Royal George Salvage

In 1839 Major-General Charles Pasley, at the time a Colonel of the Royal Engineers, commenced operations. Pasley had previously destroyed some old wrecks in the Thames to clear a channel using gunpowder charges; his plan was to break up the wreck of Royal George in a similar way and then salvage as much as possible using divers. The charges used were made from oak barrels filled with gunpowder and covered with lead. They were initially detonated using chemical fuses, but this was later changed to an electrical system using a resistance-heated platinum wire to detonate the gunpowder.

Pasley’s operation set many diving milestones, including the first recorded use of the buddy system in diving, when he ordered that his divers operate in pairs. In addition, a Corporal Jones made the first emergency swimming ascent after his air line became tangled and he had to cut it free. A less fortunate milestone was the first medical account of a diver squeeze suffered by a Private Williams: the early diving helmets used had no non-return valves; this meant that if a hose became severed, the high-pressure air around the diver’s head rapidly evacuated the helmet causing tremendous negative pressure that caused extreme and sometimes life-threatening effects. At the British Association for the Advancement of Science meeting in 1842, Sir John Richardson described the diving apparatus and treatment of diver Roderick Cameron following an injury that occurred on 14 October 1841 during the salvage operations.(1)

Pasley recovered 12 more guns in 1839, 11 more in 1840, and 6 in 1841. In 1842 he recovered only one iron 12-pounder because he ordered the divers to concentrate on removing the hull timbers rather than search for guns. By 1843 the whole of the keel and the bottom timbers had been raised and the site was declared clear.

1. Richardson J (January 1991). “Abstract of the case of a diver employed on the wreck of the Royal George, who was injured by the bursting of the air-pipe of the diving apparatus. 1842″. Undersea Biomed Res 18 (1): 63–4. PMID 2021022

Sound Barrier

The sound barrier, in aerodynamics, is the point at which an aircraft moves from transonic to supersonic speed. The term, which occasionally has other meanings, came into use during World War II, when a number of aircraft started to encounter the effects of compressibility, a collection of several unrelated aerodynamic effects that “struck” their planes like an impediment to further acceleration. By the 1950s, new aircraft designs routinely “broke” the sound barrier.

Yeager broke the sound barrier on October 14, 1947, flying the experimental Bell X-1 at Mach 1 at an altitude of 45,000 ft (13,700 m). Yeager’s flight recorded Mach 1.07, however, he was quick to point out that the public paid attention to whole numbers and that the next milestone would be exceeding Mach 2. Yeager’s X-1 is on display at the Smithsonian Institution’s National Air and Space Museum. Yeager was awarded the MacKay and Collier Trophies in 1948 for his mach-transcending flight, and the Harmon International Trophy in 1954.

– content from Wikipedia

Voskhod 1 (Russian: Восход-1, Ascent 1 or Dawn 1) was the seventh manned Soviet space flight. It achieved a number of “firsts” in the history of manned spaceflight, being the first space flight to carry more than one crewman into orbit, the first flight without the use of spacesuits, and the first to carry either an engineer or a physician into outer space. It also set a manned spacecraft altitude record of 336 km (209 mi).

The three spacesuits for the Voskhod 1 cosmonauts were omitted; there was neither the room nor the payload capacity for the Voskhod to carry them. The original Voskhod had been designed to carry two cosmonauts, but Soviet politicians pushed the Soviet space program into squeezing three cosmonauts into Voskhod 1. The only other space flight in the short Voskhod program, Voskhod 2, carried two suited cosmonauts — of necessity, because it was the flight on which Alexei Leonov made the world’s first walk in space.

As part of its payload Voskhod 1 carried a ribbon off a Communard banner from the Paris Commune of 1871 into orbit.