Showing posts with label Alessandro Volta. Show all posts
Showing posts with label Alessandro Volta. Show all posts

10 April 2018

Giovanni Aldini - physicist

Professor thought to have given Mary Shelley the idea for Frankenstein


Giovanni Aldini picked up the mantle of his uncle, Luigi Galvani, in his experiments with bioelectricity
Giovanni Aldini picked up the mantle of his uncle, Luigi
Galvani, in his experiments with bioelectricity
The physicist and professor Giovanni Aldini, whose experiment in trying to bring life to a human corpse is thought to have inspired Mary Shelley’s novel Frankenstein, was born on this day in 1762 in Bologna.

The nephew of Luigi Galvani, who discovered the phenomenon that became known as galvanism, one of Aldini’s goals in life was to build on his uncle’s work in the field of bioelectricity.

Galvani’s discovery that the limbs of a dead frog could be made to move by the stimulation of electricity sparked an intellectual argument with his rival physicist Alessandro Volta that he found uncomfortable. When he was then removed from his academic and public positions after Bologna became part of the French Cisalpine Republic in the late 18th century, Galvani was unable to progress his experiments as he would have liked.

Aldini essentially picked up his uncle’s mantle and was determined to discover whether the effect of an electrical impulse on the body of a frog could be reproduced in a human being.

Aldini conducing experiments in galvanism, as  depicted in a 19th century book
Aldini conducing experiments in galvanism, as
depicted in a 19th century book
His most famous experiment came in 1803, when he was given permission to test his electrical equipment on the corpse of George Forster shortly after he had been hanged at Newgate Prison in London, following his conviction for the murder of his wife and daughter, whose bodies were found in the Paddington Canal not long after the last sighting of them alive at the nearby Mitre Tavern.

Aldini had chosen to conduct this experiment in England because most other European countries carried out executions by beheading, and he felt needed a corpse that was fully intact.

Forster’s body was taken directly from the gallows to a nearby house, where Aldini conducted experiments using conducting rods and a battery, the existence of which, ironically, he owed to his uncle’s rival, Volta.

In front of an audience of surgeons, Aldini successful made the corpse’s facial muscles contort, causing his jaw to twitch and one eye to open. He was then able to cause the dead body to raise his right arm with a clenched fist, and to produce movement in the thighs and lower legs.

The future Mary Shelley would have been only five at the time yet as she grew up she learned all about Galvani, Volta and Aldini through two friends of her father, Humphry Davy (famously the inventor of the Davy safety lamp) and William Nicholson, who were leading electrical researchers.

Mary Shelley, as portrayed in a miniature painting by Reginald Easton in 1857
Mary Shelley, as portrayed in a miniature
painting by Reginald Easton in 1857
During the summer of 1816, it is known that Mary Shelley was in Geneva with her future husband, the poet Percy Shelley, and Lord Byron, and that among the topics of their conversation was the potential for re-animating a corpse with electricity.

At around the same time, the three friends, along with another writer, John Polidori, decided they would have a competition to see who could write the best horror story.  Mary came up with a tale of a young scientist, Victor Frankenstein, who creates a grotesque, monstrous but humanoid creature, which he brings to life with electrical charges.

The brother of Count Antonio Aldini, a statesman, Aldini followed Galvani in becoming professor of physics at the University of Bologna.

He devoted himself to his scientific work, which was mainly focussed on galvanism, anatomy and its medical applications, along with the construction and illumination of lighthouses, and with experiments for preserving human life and material objects from destruction by fire.

He died in Milan in 1834, bequeathing a considerable sum to found a school of natural science for artisans at Bologna.

A courtyard at the historic Palazzo Poggi in Bologna
A courtyard at the historic Palazzo Poggi in Bologna
Travel tip:

The University of Bologna, the oldest university in continuous use in the world, has sites dotted around the centre of Bologna.  Its headquarters are in the Palazzo Poggi, in Via Zamboni, about 1km (0.62 miles) northeast of the Fountain of Neptune just around the corner from Piazza Maggiore. The palace is adorned with many frescoes painted by Mannerist and early Baroque artists, including Prospero Fontana, Pellegrino Tebaldi and Niccolò dell'Abbate.

The Basilica of San Petronio, with its half-finished facade
The Basilica of San Petronio, with its half-finished facade
Travel tip:

Bologna is a progressive, left-leaning city with a lively student population and considerable history and culture. Italians regard it as one of the country’s most beautiful cities and has the advantage of being not nearly as busy as Rome, Florence and Venice, which tend to the the magnets for overseas visitors.  The Piazza Maggiore, the medieval Asinelli and Garisenda towers and the Basilica of San Petronio, with its half-finished facade - pink marble at the bottom with bare bricks above - are among the main sights.  Another advantage, apart from the lack of crowds, in the summer months are the 45km of porticoed walkways.

More reading:

Luigi Galvani, the father of bioelectricity

Alessandro Volta and the world's first battery

The death of the poet Percy Bysshe Shelley


Also on this day:

1926: Airship leaves Rome on mission to North Pole

1991: The Moby Prince ferry disaster


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5 March 2017

Alessandro Volta – scientist

Invention sparked wave of electrical experiments


Alessandro Volta as depicted in a painting by an unknown artist
Alessandro Volta as depicted in a painting
by an unknown artist
Alessandro Volta, who invented the first electric battery, died on this day in 1827 in Como.

His electric battery had provided the first source of continuous current and the volt, a unit of the electromotive force that drives current, was named in his honour in 1881.

Volta was born Alessandro Giuseppe Antonio Anastasio Volta in 1745 in Como.

He became professor of physics at the Royal School of Como in 1774. His interest in electricity led him to improve the electrophorus, a device that had been created to generate static electricity. He discovered and isolated methane gas in 1776, after finding it at Lake Maggiore and was then appointed to the chair of physics at the University of Pavia.

Volta was a friend of the scientist Luigi Galvani, a professor at Bologna University, whose experiments led him to announce in 1791 that the contact of two different metals with the muscle of a frog resulted in the generation of an electric current.

Italy's 10,000 lire note used to have an image of Volta on the front and the Tempio Voltiano on the reverse
Italy's 10,000 lire note used to have an image of Volta
on the front and the Tempio Voltiano on the reverse
Galvani interpreted that as a new form of electricity found in living tissue, which he called animal electricity.

Volta felt that the frog merely conducted a current that flowed between the two metals, which he called metallic electricity. He began experimenting in 1792 with metals alone and found that animal tissue was not needed to produce a current.

This provoked much controversy between the animal-electricity adherents and the metallic-electricity advocates, but Volta won the argument when he unveiled the first electric battery in 1800.

Known as the voltaic pile, or the voltaic column, Volta’s invention led to further electrical experiments.

Within six weeks, English scientists William Nicholson and Anthony Carlisle used a voltaic pile to decompose water into hydrogen and oxygen, thus discovering electrolysis and creating the field of electrochemistry.

In 1801 in Paris, Volta demonstrated the way his battery generated an electronic current in front of Napoleon, who made Volta a count and a senator of the Kingdom of Lombardy.

A statue at the University of Pavia commemorates Volta's work
A statue at the University of Pavia
commemorates Volta's work
Francis I, Emperor of Austria, made Volta director of the philosophical faculty at the University of Padua in 1815.

Volta retired in 1819 to his estate in Camnago, a frazione of Como, which is now named Camnago Volta in his honour. He died there on 5 March 1827, just after his 82nd birthday, and he was buried in Camnago Volta.

He is commemorated with a statue at the University of Pavia and another in Piazza Volta in Como. A house in the Via Brera in Milan in which he lived in the early part of the 19th century is marked with a plaque.

Travel tip:

Como, where Volta was born and died, is a city at the foot of Lake Como. It has become a popular tourist destination because it is close to the lake and has many attractive churches, gardens, museums, theatres, parks and palaces to visit. The Villa Olmo, built in neoclassical style there in 1797 by an aristocratic family, has hosted Napoleon, Ugo Foscolo, Prince Metternich, Archduke Franz Ferdinand I and Giuseppe Garibaldi, to name but a few of the eminent people who have stayed there.

Hotels in Como by Booking.com


The Tempio Voltiano by Lake Como houses a museum dedicated to the life of Alessandro Volta
The Tempio Voltiano by Lake Como houses a museum
dedicated to the life of Alessandro Volta
Travel tip:

The Tempio Voltiano is in a public garden near the side of the lake in Como and houses a museum dedicated to the life and work of Alessandro Volta. The museum has a collection of scientific instruments used by the inventor, including his early voltaic piles, and some of his personal belongings and awards he received. A picture of the temple used to be featured on the back of a 10,000 lire banknote, with Volta’s portrait on the front.