Fahrenheit & Celsius (#57/#56)

Fahrenheit

Daniel Gabriel Fahrenheit was born on May 24, 1686 in Danzig in the Polish-Lithuanian Commonwealth. Fahrenheit came from a family of merchants, but in 1701, both of Fahrenheit's parents died from eating poisonous mushrooms. After this, Fahrenheit moved to Amsterdam to begin training to become a merchant himself.

While in Amsterdam, Fahrenheit became interested in natural science and began studying and experimenting in the field. Fahrenheit also began to travel throughout Northern and Central Europe. While travelling, Fahrenheit met many notable members of the scientific and Enlightenment communities, including Gottfried Leibniz, co-developer of infinitesimal calculus, and Ole Romer, who made the first quantitative measurements of the speed of light.

In 1717, Fahrenheit settled in The Hague as a glassblower who specialized in making barometers, altimeters, and thermometers. Fahrenheit also lectured in chemistry in Amsterdam. In 1724, Fahrenheit created a scale to record temperature based on three points. These three points were the lowest point on the thermometer, or 0 Fahrenheit (F), the freezing point of water, or 32 F, and body temperature, which he calculated to be 96 F. The system was later changed so that the difference between the freezing and boiling points of water was exactly 180 F. 

Celsius

Anders Celsius was born on November 27, 1701 in Uppsala, Sweden. Unlike Fahrenheit, Celsius came from a family of scientists. Celsius's father and maternal grandfather were astronomers, and Celsius's paternal grandfather was a mathematician. Celsius studied at the Uppsala University and in 1730, Celsius became a professor there.

Celsius published many works in several fields of study. In one study conducted, he was the first to suggest that there was a connection between the appearance of the aurora borealis and changes in the magnetic field of the Earth, which was later proved to be correct. He also was part of the 1736 expedition to Lapland to measure the length of a degree along the meridian. This expedition, when compared to similar measurements from Peru, proved Isaac Newton's theory that the Earth was ellipsoid, rather than completely round, and flattened at the poles. Celsius was also one of the first people to measure the magnitude, or brightness, of certain stars, and, even with the equipment he used, Celsius was quite accurate.

Celsius is most famous for his creation of the temperature system that was named after him. Celsius understood that the boiling point of liquids was not simply dependent on heat but on pressure as well, so using a standard pressure (the pressure at sea-level), Celsius created a thermometer. At the standard pressure, the thermometer would read 100 Celsius (C) at water's melting point and 0 C at its boiling point. A year after his death, the system was reversed so the 0 C would be freezing and 100 C would be boiling.

The End

Fahrenheit died in The Hague on September 16, 1736 and is buried there at Cloister Church. Celsius died on April 25, 1744 of tuberculosis soon after co-founding the Royal Swedish Academy of Sciences. Fahrenheit's system of temperature measurement was widely accepted throughout the world and is still used by the general population of the United States, Belize, and in parts of the United Kingdom and Canada. Celsius's system, when published, replaced Fahrenheit's system in all but the above stated regions. The Celsius system has also become the standard measurement system for the majority of scientific studies, and the Kelvin System is based off of that of Celsius. Fahrenheit and Celsius are on our list because they create the first systems to measure temperature without just say "It's cold." or "It's hot."

Dimitri Mendeleev (#59)

Background

Dimitri Ivanovich Mendeleev was born on February 8, 1834 near Tobolsk in Siberia. There is no consensus on how many siblings Mendeleev had, but all sources agree that the number was at least eleven. Dimitri's father supported the family by teaching fine arts, politics, and philosophy, but after some time, Mendeleev's father became blind and lost his teaching position. Mendeleev's mother was forced to restart her family's abandoned glass factory, but when he was thirteen, Mendeleev's father died and the glass factory was destroyed in a fire, so Mendeleev was sent to study at the Gymnasium in Tobolsk.

In 1850, Mendeleev's family moved to St. Petersburg and Mendeleev began to attend the Main Pedagogical Institute. After graduation in 1855, Mendeleev contracted tuberculosis and moved to the Crimean Peninsula to recover his health. While away, Mendeleev became the science master of the Simferopol gymnasium No. 1, but returned to St. Petersburg in 1857.

On April 27, 1862, Mendeleev married Feozva Nikitichna Lescheva with whom he was married to until 1882, when he became obsessed with Anna Ivanova Popova. Mendeleev divorced Lescheva and married Popova.

Career in Science

Mendeleev studied several areas in science including the capillarity of liquids and the science behind spectroscopes. In 1864, Mendeleev became a professor at Saint Petersburg Technological Institute and at Saint Petersburg State University. In 1865, Mendeleev became a Doctor of Science and achieved tenure two years later. Mendeleev is widely credited as being the man who helped Saint Petersburg become an internationally recognized center of chemistry. He is also said to have been the man who brought the metric system to Russia.

In 1869, Mendeleev was writing a book on chemistry and, while doing so, organized a table of  the 56 known elements based on atomic mass, weight, and chemical properties. This was the first periodic table ever created. Mendeleev also predicted the existence of three chemicals that would make his table make more sense. These predicted elements did exist as gallium, germanium, and scandium. The periodic table was widely expanded upon as more knowledge came in concerning the elements and their properties.

Mendeleev went on to formulate new state standards for the production of vodka in 1893 while working as the Director of the Bureau of Weights and Measures. He also helped to investigate the properties of petroleum and found the first oil refinery in Russia. He was also nominated several times for the Nobel Prize in Chemistry, but was not chosen for the award due to Svante Arrhenius, who discouraged his selection due to Mendeleev's critiques on Arrhenius's work.

The End

Before he died, Mendeleev received the Copley Medal from the Royal Society of London. He also was elected as a member of the Royal Swedish Academy of Science. Mendeleev died in 1907 at the age of 72 in Saint Petersburg due to influenza. Mendeleev has been honored by having both a crater on the moon and an element named after him. Mendeleev is on our list because he developed a table that is known world wide and can be found in almost every university and high school science classroom. Also, anyone with a moon crater named after them is pretty awesome.

Pliny the Elder (#112)

Beginnings

Gaius Plinius Secundus, or Pliny the Elder, was born in the year 23A.D. He was the son of an equestrian born in Como. He came from the Plinii family, but made his own family name, Secundus.

Life

Pliny entered the army in 46 A.D. at the age of 23. Pliny, during his army work, helped to defeat the Germanic Chauci tribe, and helped construct the canal between the Maas and the Rhine. While in the army, Pliny began studying missile use on horseback.  By 56 A.D., Pliny's service was up, but did not leave the army.  Pliny lived in Rome soon after the Great Fire, and remembers the building of Nero's great palace. Pliny did not personally know Nero, but in his later career as a soldier, Pliny took orders from emperor Vespasian and rode in the army with future emperor Titus. Pliny continued to study nature, observing a solar eclipse in Campania in 59 A.D. As a senior officer in the army in 69 A.D., Pliny was sent to Africa, where he spent time studying poisonous frogs. While working in Hispania from 70-72 A.D., Pliny learned agricultural techniques and studied gold mining methods. Pliny used this information for his books, which he began to write in 69 A.D., the year that Nero's oppressive reign ended. Pliny was wrote about many different topics, creating works that are closer to encyclopedias than to anything else. Though Pliny wrote on history and conspiracy, his most famous works are those on natural history. Pliny's last book is called Naturalis Historia, which is an encyclopedia of the knowledge Pliny gained over his life. The book covers the subjects of botany, zoology, astronomy, geology, mineralogy, and technology. Much of what Pliny wrote about has been confirmed through archaeological finds, and the book remains one of the most important surviving written works of the Roman Empire.

The End

Much of what we know about Pliny the Elder was recorded by his nephew, Pliny the Younger. Among these facts is an account of Pliny the Elder's death. Pliny, in August of 79 A.D., was stationed in Misenum, across the Bay of Naples from Mount Vesuvius, which loomed over Pompeii and Herculaneum. When Vesuvius erupted, Pliny was preparing to observe the volcano more closely when he received word from a friend asking for rescue from Herculaneum. As Pliny's galley's reached Herculaneum, pumice and cinders began to fall. On the beach of Herculaneum, Pliny's men helped to save quite a few people, though in the process, Pliny became weak and couldn't walk without help. Eventually, Pliny died. Most believe that Pliny died due to the combination of toxic volcanic gases and the asthma that Pliny suffered from. Pliny is on our list because not only was he alive for the reign of several of the most famous empires and witnessed the eruption of Pompeii, but because Pliny the Elder was a brilliant naturalist, scientist, and writer, gaining fame not only in his time period, but in our time period as well.

Nicolaus Copernicus (#115)

Young Life and College

Nicolaus Copernicus was born on February 19, 1473 in Poland from two merchant families. He was the youngest of four children. At first, while being supported by his uncle, Copernicus studied at the University of Krakow in 1491, where he attained the mathematical and astronomical skill for his later achievements. He also was able to study the natural-science writings of Aristotle and Averroes while studying in Krakow.  In 1495, Copernicus left Krakow because of his uncle Watzenrode wanted him to study law in Italy, hoping for Copernicus to join the Warmia canonry, which Watzenrode was the Prince-Bishop of. In 1497, Copernicus registered in the Bologna University of Jurists. In Bologna, Copernicus studied law, the humanities, and astronomy. He became the assistant of astronomer Domenci Maria Novara da Ferrara. Under Ferrara, he began to find peculiarities in Ptolemy's geocentric universe theory based on observations of the star Aldebaran. Copernicus moved to Rome in 1500, where he continued his astronomical studies. Copernicus also went to the University of Padua, where he studied medicine, which include astrology. Over his education, Copernicus learned Latin, Greek, German, and Italian along with his native Polish.

Work

Copernicus, after his studies, became his uncle's secretary and physician in Heilsberg. He took part in almost all of his uncles political, administrative, and economic activities. This is where Copernicus began work on his heliocentric theory. Copernicus also made trips on business from his uncle. In 1510, Copernicus ended work for his uncle, and worked as a translator of Greek and Latin texts. In 1514, the first outline of the heliocentric world was written. Throughout his life, Copernicus worked as a assistant to politicians and religious leaders while continuing to study astronomy. By 1532, his manuscript on heliocentrism was basically complete, but he resisted publishing due to fears of scorn. His book, De revolutionibus orbium coelestium, was published under Georg Rheticus, who had published other works of Copernicus. Along with Andreas Osiander, Rheticus worked to have the book published in 1542.

The End

Legend has it that the first copy of De revolutionibus ever printed was placed in Copernicus's hand on May 24, 1543, the day that Copernicus died. Copernicus makes our list for being one of the few people in the world who changed the world's mind. Before him, the common theory was that everything orbited the Earth. Copernicus proved them all wrong. He changed the way people looked at the world, and not many people can do that.

The Elephant Seal

This blog is called the History Dropoff because it is where I drop off facts on mainly history, but I use this blog to keep my family from having to listento me, so I also dropoff other information, like this post.



The Elephant Seal is a species of seal that comes in two types of species. The Northern Elephant Seal is known as Mirougna angustirostris and lives on the coast of California and Mexico, while the Southern Elephant seal, Mirougna leonina, lives only in the southern hemisphere, in places such as New Zealand, South Georgia, Antartica, etc. Elephant seals are marine mammals that come together only to breed. The Northern variety breed in January and February, but the Southern species mates from September to October. Although Elephant Seals are clumsy on land, they can swim with great power deriving from the alternating hind flippers, which they can use to catch fish and squid. The most unique feature of an elephant seal is its large nasal cavity, which only appears on males and takes 8 years it to fully develop. During mating season, the cavity fills with blood and is able to amplify aggressive roars. Along with having an odd nose, male elephant seals also have many other traits that females do not, which the bulls use during battles for dominance. Males can weigh up to 2300kg more than a female, weighing in at about 3200kg (7055lb). Males are also longer than females and can be 4.9m (16ft) long. Other outstanding battle traits used by bull Elephant Seals are tough neck skin acquired as a youth and enlarged canines. Elephant seals can have cubs when the male is 4 to 6 years old and the female is 2 to 3 years old, and after 11 months, the seal gives birth to a youth, which will hopefully live for another 20 years. Although Hooded seals (Cystophora cristata) also have traits like those of an Elephant Seal, they're not as large as Elephant seals, and their nasal cavities are no match to those of an Elephant Seals, the Elephant of the Sea.


Infromation from...
The Encyclopedia of Animals
Consultant Editor: Dr. Per Christiansen