Pythagoras in Temple Bar Moument
The Temple Bar Memorial (1880) stands in the middle of the road opposite Street’s Law Courts marking the place where Wren’s Temple Bar used to stand as the entrance to London from Westminster.
The monument has two standing statues dedicated to Queen Victoria and the Prince of Wales because both were the last royals to pass through the old gate in 1872.
The reliefs round Queen Victoria contains some allegories which includes the first picture about the Euclidean demonstration of the theorem of Pythagoras. We also find a ruler and a globe with the ecliptic.
Location: Temple Bar (map)
The National Portrait Gallery in London
This was one of the great moment in my last holidays in England! Newton and me together in the same picture! (I must thank the guard because he allowed me to take this picture) Today is 25 December and this is the reason because I am publishing today this picture: Newton was born on December 25, 1642 (Julian Calendar) so… Happy Birthday Great Mind!
Sir Isaac Newton (1642-1727) [by Sir Godfrey Kneller (1646-1723)]
An immensely influential mathematical scientist, in one year (1665-6), when driven from Cambridge by plague, Newton formulated a series of important theories concerning light, colour, calculus and the ‘universal law of gravitation’. According to tradition, he developed the latter theory after seeing an apple fall from a tree. He published Principia (1687) and the Optiks (1704), and was knighted in 1705. Newton was President of the Royal Society from 1703 until his death.
Newton is not alone and he is accompanied by other great English scientist like Edmund Halley. The portrait of Halley is attributed to Isaac Whood (1688-1752) from 1720. Halley has a chart showing his predicted path accross Southern England of the total solar eclipse of 22 April 1715.
Edmond Halley (1656-1742)
Astronomer. At the age of twenty-two in 1678 he published his catalogue of the stars of the southern hemisphere, and in 1705 his celebrated work on comets. Halley published Newton’s Principia at his own expense, 1687; he was appointed Astronomer Royal in 1721. He successfully predicted the reappearance of the great comet in 1758 (‘Halley’s Comet’).
Sir Christopher Wren (showing a plan of St. Paul’s Cathedral) is also in the Gallery:
Wren was an architect and scientist. After the Great Fire of 1666, he rebuilt St. Paul’s Cathedral and many of the London City Churches; his work includes the Sheldonian Theatre in Oxford (1664-9), Trinity College Library in Cambridge (1674-84), Chelsea Hospital and Greenwich Hospital (from 1696). He was professor of Astronomy at Oxford and later President of the Royal Society.
Herschel and Boyle are also exhibited in the Gallery but it was almost impossible to take a picture of them so it’s better if you go to the National Portrait Gallery web and you’ll see better pictures of them.
Before ending this post, we must look at this anamorphic picture of King Edward VI:
Edward VI 1537-53 by William Scrots (active 1537-53). Oil on panel, 1546.
This unusual portrait of Edward was painted in 1546 the year before he became king. He is shown in distorted perspective (anamorphosis), a technique to display the virtuosity of the painter and amaze the spectator. Anamorphic portraits were relatively popular in mainland Europe at this time, but this painting was considered particularly remarkable […].
The anamorphosis is a very interesting mathematical technique which must be explained in detail but I am not going to do it now.
MERRY CHRISTMAS… or ….
HAPPY NEWTON’S BIRTHDAY!
Location: National Portrait Gallery in London (map)
The Royal Observatory in Greenwich (and III)
The third step in the visit to the Royal Observatory of Greenwich is Flamsteed House.
The Royal Observatory of Greenwich was founded in 1675 when Charles II ordered that a small observatory be built in Greenwich Park and appointed John Flamsteed as his ‘astronomical observator’. Flamsteed’s task was to make observations that would improve astronomical navigation, in particular providing a means of finding longitude at sea.
The ceiling of the first room is painted with a map of the night sky and there are portraits of the ten Astronomers Royal who lived here between 1676 and 1948:
Christopher Wren was responsible for building the Observatory. He later said that it was designed ‘for the Observator’s habitation & a little for Pompe’. The following four rooms were Flamsteed’s living quarters. They were incorporated into the enlarged home of the Astronomer’s Royal over the next two and a half centuries. Beyond these, upstairs, is the magnificient Great Star Room, or Octagon Room.
The Octagon Room is one of the few surviving interiors designed by Wren and it was used mainly for observing eclipses, comets and other unusual celestial events.
The 32-inch Astronomical Quadrant is located in this room. It is signed by John Bird but the telescope which was once attached is missing.
The engraving of the Octagon Room by Francis Place shows a similar, earlier quadrant standing on a wheel-tripod platform, which allowed the astronomer to roll it from window to window.
On the wall behind the quadrant we can see three replicas of the clocks which were made in 1676 by Thomas Tompion and sold by Flamsteed’s widow some years later. There is also a replica telescope tube of the kind used here until 1765. Will my daughter be able to discover a new planet?
If we go downstairs now we’ll discover an exhibition about the determination of the longitude at sea:
Where am I?
At sea, navigation is a matter of life and death. Out of sight of land, how can you tell where you are?
By 1700, skilled seamen could find their position north or south (their latitude), but still lacked accurated instruments or methods to calculate their east-west position, known as longitude.
With growing international trade, the lives and valuable cargoes lost in shipwrecks made solving this ‘Longitude Problem’ urgent for all sea-going nations.
The exhibition starts with these two 17th-century globes from North Africa (left) and Persia (right) and then you meet the star of the ‘Longitude Problem’:
Finding longitude – the timekeeper method
One solution to the Longitude Problem was an accurate and portable sea-going clock. By 1726, news of the Longitude Prize had reached John Harrison, a carpenter and self-taught clockmaker from Lincolnshire. Harrison was already making highly accurate land-based clocks and had solved major problems to do with temperature change and friction.
Harrison spent the next 45 years of his life developing portable sea-going timekeepers that would accurately, in spite of a ship’s motion and temperature changes. Each timekeeper represented years of obsessive labour.
By 1760, Harrison had solved the Longitude Problem with his fourth marine timekeeper, now known as H4. It is one of the most important machines ever made.
Harrison’s first timekeeper [H1]
This timekeeper took five years to build. In 1736, it was tested on a sea voyage to Lisbon and back. Harrison was very seasick, but the timekeeper worked. It was the most accurate sea-going clock then known, though not quite accurate enough to win the 20.000 pounds prize.
This prize was offered in 1734 by the British government for a ‘practical and useful’ method enabling ships to determine their longitude at sea.
In the exhibition there are also some timekeepers more and the portraits of some of the most important scientific men which lived in the same time as Harrison: Halley succeeded Flamsteed as Astronomer Royale and his major programme was to replace all the astronomical instruments which were sold by Flamsteed’s widow, and to chart the Moon’s 19-year cycle.
Newton advised the Parliamentary committee that established the Longitude Prize and became a member of the Board of Longitude:
Finally, apart of the camera obscura, we can find outside the Family Tombstone of Halley which was moved to the Observatory from the churchyard of St. Margaret’s in Lee when Halley’s tomb was restored in 1854. The tomb itself is still located at St. Margaret’s with a replica tombstone in place:
As you have seen, you must visit the Royal Observatory in Greenwich if you visit London: it’s only a few metro stops from the center of the city!
Location: Greenwich Observatory (map)
Temple Bar in London
Temple Bar is the only surviving gateway into the City of London erected in 1672 at the behest of Charles II to replace a previous timber structure which had survived the Great Fire but was falling into disrepair. The new gateway was designed by Christopher Wren.
Nowadays, you can cross the gateway from St. Paul’s cathedral to a very cool new square…
…where you can find an analematic sundial in one of the facades:
Location: Temple Bar (map)
Brook Taylor’s tomb
I tried to find Brook Taylor’s tomb when I was in London. Taylor (1685-1731) is well known from his famous Taylor series which we can find in all the mathematical texts of our students. He contributed to the development of calculus (he also made some experiments in magnetism) and became one of the most important English mathematicians of the 17th century.
When I read that Taylor was buried in St. Anne’s churchyard I thought that I had to find a grave in a cemetery but… the churchyard is a public garden nowadays! So the tombs have been replaced by tables, chairs, cold beverages and music. For the moment I was content with the information I read on a bulletin board:
The Church of St. Anne, Soho, built 1677-1685 and probably designed by Sir Christopher Wren or William Talman, possibly both, was consecrated by Henry Compton, Bishop of London, on 21st March 1686. […] The churchyard was included in the original proposals for the establishment of a new parish and church, and for some one hundred and sixty years it served as the last resting place for most of Soho’s cosmopolitan population. It has been stimated that there were over 100.000 interments in this plot of just three-quarters of an acre, with about 14.000 of them in the period 1830-1850.
By the middle of the 19th century the insanitary conditions caused by overcrowded burial grounds had given rise to so much public concern that Parliament was obliged to pass a series of Burials Acts. In 1853 churchyards within the Metropolis were closed to further interments which thereafter took place in the new suburban cemeteries. […]
So, Taylor’s tomb is somewhere in this plot of three-quarters of an acre together with 99.999 people more.
Location: St. Anne’s Churchyard (map)
The Museum of the History of Science (II)
The great scientific names in the History of Science also have their space in the museum as we can see in this medal with the name of Edmund Halley.
Christopher Wren’s name is in one of the windows of the stairs through which you go to the first floor:
The inscription is under a big “coat of arms” dedicated to the Science:
We must also notice this portrait of Tycho Brahe who is next to portraits of Flamsteed and Hevelius
Finally, I am going to mention the famous blackboard written by Albert Einstein:
Location: The Museum of the History of Science (map)
The Christ Church College in Oxford
One of the most beautiful colleges in Oxford is the Christ Church. The bell tower was built by sir Christopher Wren (1682) who was former student there and Lewis Carrol was also among its famous students. I couldn’t visit it but Ia m sure that I’ll do in my next visit to Oxford!
Location: Christ Church College (map)
The Bodleian Library
One of the best days in my holidays was my visit to the Bodleian Library in Oxford. This was the first library for Oxford University and it was initially housed in a room above the Old Congregation House (c. 1320). In the XVth century, it was moved to a new building by Humfrey, Duke of Gloucester, younger brother of King Henry V, because of it had to host his collection of more than 281 manuscripts, including several important classical texts. So in 1444 the University decided to erect a new library over the Divinity School although it wasn’t opeded until 1488. After a lot of years of decay, the library was rescued by Sir Thomas Bodley (1545–1613), a Fellow of Merton College who had travelled extensively in Europe and had between 1585 and 1596 carried out several diplomatic missions for Queen Elizabeth I.
He donate a great amount of money in 1598 and the old library was refurnished to house a new collection of some 2,500 books, some of them given by Bodley himself, some by other donors. So thanks to Bodley, Oxford had its wonderful and famous library which is possible to visit nowadays.
I’ve visited the building and I’ve been very lucky because I’ve been able to book a visit to the library for the afternoon (the last ticket of the day!).
The forecourt is full of doorways to different schools as the Schoof of Astronomy and Retorics…
or the School of…
The first room is the Divinity School and it was used by students to deliver their thesis (no women were allowed to study at Oxford until the XXth century!). Can I deliver my thesis too?
The room is full of “W” which are its architext’s symbol: sir Christopher Wren. Finally, I’ve visited the library and I’ve seen some mathematical books as Cardano’s Ars Magnae.
It was a very great day in Oxford!
Location: Bodleian Library (map)
Christopher Wren’s tomb in St. Paul’s Cathedral
St. Paul’s Cathedral is the masterpiece of Sir Christopher Wren. It was built between 1675 and 1710 after its predecessor was destroyed in the Great Fire of London, and services began in 1697.
A lot of very important English men like Lord Nelson or the Duke of Wellington are buried here but among all these names we notice that the great Christopher Wren was also buried here under the crypt:
On the wall next to the grave there is this plaque written in Latin:
Christopher Wren is buried under the founder of this church and of the city. He lived beyond the age of ninety, not to himself but for the public good reader. If you seek his monument, look around you.
Died February 25, 1723, s. 91.
There is also a memorial plaque for “one of the most ingenious men who ever lived”: Robert Hooke.
It’s forbidden to take pictures in the cathedral but it’s always possible to find a guard who allows you to take a pair of them. Thank you very much anonymous guard!
Location: St. Paul’s Cathedral in London (map)