Tuesday, April 22, 2014

Caroline Herschel, Household Drudge to Sweeper of Comets

Caroline Herschel
Caroline Herschel, linocut by Ele Willoughby (aka minouette), 2014

This linocut of astronomer Caroline Herschel (16 March 1750 – 9 January 1848) shows her and her own observations of comets, in dark black-gold and blue-black ink on lovely handmade Japanese kozo (or mulberry) paper, 8.1" by 9.25" (20.8 cm by 23.5 cm). There are 12 prints in the hand-printed edition.

German-born Caroline Herschel, while overshadowed by her brother William (who discovered Uranus, amongst his other astronomical accomplishments), was a real pioneer as a woman in astronomy and made her own important contributions. In fact, she became the first salaried female scientist, when King George III hired her to assist her brother, at a time when there were few professional scientists anywhere. Hers was a real life sort of Cinderella story, where rather than marrying a prince, she made a life and career for herself. Marriage was the expected role for a woman of her time, but she was deemed unmarriageable, since a childhood bout of typhus stunted her growth. Her mother thought she should train to be a servant, and purposely stood in the way of her learning French, or music, to prevent her from seeking employment as a governess. She wanted a perpetual unpaid maid. Her father sometimes managed to include her in William's lessons when their mother was absent. William had fled to England after the Seven Years War and made a life as a musician and composer in Bath. William managed to rescue his younger sister from their mother's clutches, under the pretext that she might have the voice to be a solo singer in Handel's oratorios, as she too was a natural musician. Of course, he also wanted a woman to manage his bachelor household. Meanwhile, he developed a real passion for astronomy. So, by the time she arrived, all his spare time away from music was devoted to astronomy and she found that despite her singing talent, she was roped into assisting with the construction of telescopes, rather than receiving music lessons. By 1781, William had discovered a new planet - Uranus , which he cannily dubbed the 'Georgian Star' after King George III. This had the desired effect of securing himself a pension, so that he could spend his time on astronomy (so long as he would present it to the King when asked).

William and Caroline worked together at Slough, observing the night sky with a variety of telescopes. William built some very large telescopes and had Caroline take notes of what he observed, while she used smaller 'sweeper' telescopes to sweep the skies for interesting object. She discovered 11 nebulae (2 of which turned out to be galaxies) which were previously unknown! She also found 8 or 9 comets, as well as making and sharing observations of comets discovered by others. The portrait is based on a miniature of Caroline, as well as her own notes and diagrams from 1 August 1786, when she discovered her first comet, now known as Comet C/1786 P1 (Herschel). On the left, her sketches of the object "like a star out of focus" which she correctly identified as a comet, is at the centre of the three circular diagrams labelled I, II and III. On the right, her Fig I and Fig II show her observations the following night, noting the position of the comet relative to the constellations of Ursa Major and Coma Berenices.

She also independently re-discovered Comet Encke in 1795, first recorded by Pierre Méchain in 1786. Later, in 1819, her observations help Johann Franz Encke recognize it was a periodic comet, like Halley's comet. Encke was able to calculate its orbit, partially due to her observations. The comet shown behind Caroline is based on a recent photo of Comet Encke, which returns every 3 years.

In order to calculate orbits of newly discovered comets, it was important to let other astronomers know as soon as possible. The letter post was often not fast enough, if the weather turned cloudy. She discovered her 8th comet while her brother was away. So, she took matters into her own hands. After an hour's sleep, she saddled a horse, and road the roughly twenty-six miles to the Greenwich Observatory of the Astronomer Royal, Nevil Maskelyne, much to his astonishment.

One of her important impacts on astronomy was that her early success showed her brother how even an amateur using a small telescope could find previously unobserved nebulae, and hence that there was real value in making systematic sweeps of the night sky. Partnering together, with William sweeping the sky with his 20 foot telescope and Caroline taking notes by lamplight just inside the window, they went on to discover 2507 nebulae and clusters over two decades of work. Further, she acted as 'computer', doing the mathematical grunt work for her brother's observations. William's study completely revolutionized astronomy, and it couldn't have happened without Caroline's help.

They worked side by side nightly until 1788, when William married (at age 49). Caroline was no longer needed to run his household, and he offered her money as compensation. She, however, convinced him to request her own salary from the King, which she received. She moved to a cottage in the garden. She did a lot of her own observing for the next nine years (while William was otherwise occupied at nights), and gained more fame in her own right.

In 1797 the standard star catalogue used by astronomers was published by John Flamsteed. It was tough to use since it appeared in two volumes, with discrepancies. William suggested that a proper cross-reference would be a great help and a project for Caroline. She produced the resulting Catalogue of Stars, published by the Royal Society in 1798. It contained a index of all of Flamsteed's observed stars, all of the errors in his volumes and a further 560 additional stars.

When William died in 1822, she returned to Hanover, where she was born, but she continued her cataloguing and confirming of William's observations. Her catalogue of nebulae aided her nephew John Herschel in his astronomical work. The Royal Astronomical Society presented her with their Gold Medal in 1828 for this catalogue. She was the first woman to receive the honour (and remained the only woman until Vera Rubin in 1996).

She and Mary Sommerville were the first women admitted to the Royal Astronomical Society, when they were elected Honorary Members in 1835. In 1838 she was elected an honorary member of the Royal Irish Academy in Dublin. In 1846, at age 96 she also received a Gold Medal from the King of Prussia, for her astronomical work (presented by none other than Alexander von Humboldt). An asteroid and moon crater have been named in her honour.

You can find more in the great article  on Caroline Herschel by Micheal Hoskin AAS Comittee on the Status of Women site (to which this blog post is indebted), Caroline Herschel's wikipedia entry,  and the ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY entry on her notes.

Tuesday, April 15, 2014

Two weevils, one stone

I don't know about you, but I have some unrepentant punsters in my life. I swear, you hear enough puns, it changes the way you think. Soon, you find yourself researching weevils.


Weevil, weevil rock U
Weevil, weevil, rock U by minouette


This linocut on Japanese paper illustrates a terrible pun: 'Weevil weevil rock U' rather than "We will, we will rock you," of course. The larger of these two weevils is the extravagant, long-necked red and black giraffe weevil (or giraffe-necked weevil or Trachelophorus giraffa) from Madagascar which can grow to as long as an inch or 2.5 cm in length. The smaller of these 2 is Neocoenorrhinus germanicus, a blue-black weevil, merely 3.9 mm (0.15 inches) found in Southwest Asia, southern Siberia, Russia, and parts of Europe. They are shown roughly 4 times life-sized.

I found a way to use a single block for two terrible puns. It's the lesser of 2 weevils rather than the lesser of two evils, of course.

The lesser of 2 weevils
Weevils by minouette


This print would make a great gift for the entomologist with a sense of humour or a passion for music, the bug-loving fan of Queen or idiom or typography, the punsters and those who always seem get song lyrics hilariously bumbled. We all have a friend like that, no?


Sunday, April 13, 2014

Territories

NWT
Northwest Territories by minouette

I got a really interesting message from a customer this week. After purchasing my Northwest Territories and Nunavut linocuts, he let me know why. The Collège André Malraux de Granville in France has created an 'artothèque' (great word no? like a bibliothèque or library, except for art) on the theme of territories. They've gathered art from 13 artists from France, Algeria, Canada and Ukraine. My prints will be representing Canada!

I love that my prints are making their way in to some institutional collections and the idea of international artists representing what 'territories' mean to them is fascinating. I'd love to see what else they've purchased.

Nunavut
Nunavut by minouette

Wednesday, March 26, 2014

♥♥♥

Another ♥s milestone on things from secret minouette places yesterday - undoubtedly thanks to the Etsy blog article! The shop now has more than 2300 fans! It's gratifying, encouraging feedback from the invisible people out there on the internet who actually find and appreciate my work. So, I'd like to take a moment to thank each and every one, as well as the 866 Etsy followers, 909 twitter followers, 1541 pinterest followers, 619 fans of the things from secret minouette places fanpage, and last but not least, anyone who follows this blog!

Hedy Lamarr, inventor of Frequency Hopping

Hedy Lamarr linocut
Frequency-hopping with Hedwig Keisler, aka Heday Lamarr, linocut by minouette
This linocut portrait is of inventor and actress Hedy Lamarr (9 November 1914 – 19 January 2000), best known as a star of Hollywood's Golden Age. The linocut is printed in indigo and blue on Japanese kozo paper 9.25" by 12.5" (23.5 cm by 32 cm), inked à la poupée in an edition of 12.

Born Hedwig Keisler in 1914 in Vienna, Hedy became famous after her risqué and notorious starring role in Gustav Machatý's 1933 film Ecstasy. Friedrich Mandl, her first of six husbands (to whom she was married at the time), objected to what he felt was exploitation of his wife, including shots of her nude and simulating an orgasm. He tried unsuccessfully to buy up all copies of the film. Hedy objected to her husband, the munitions manufacturer, dealing with fascists including Mussolini and Hilter, despite the fact that she and her husband were both of Jewish heritage. Hedy had learned that the secret of her beauty was to, in her words "stand there and look stupid” though she was in fact highly intelligent, a mathematics prodigy, and an astute innovator. So while Axis leaders and arms dealers attended lavish parties at their castle home, Hedy gained a great deal of sensitive military intelligence, including intimate knowledge of the problems associate with radio-control of torpedoes. She decided to leave her controlling husband. She made her escape by disguising herself as her own maid (by drugging her and stealing her clothes), just in time to avoid the annexation of Austria. She took this intelligence with her to Paris, and on to London. In London she met Louis B. Mayer, who renamed her 'Hedy Lamarr' and hired her to work for MGM. She went on to make dozens of Hollywood films opposite all the big stars of the Golden Age, and was known as one of the most beautiful women in the world.

In 1940, spurned by the tragic sinking of a boatload of refugees, by a German U-boat torpedo, Hedy put her mind to the problem of national defense. She knew that torpedoes were guided by radio signals, of a single frequency, which were vulnerable to interference or "jamming". She had the idea that if multiple frequencies were employed, like a radio station which varied its channel unpredictably, it would not be possible for the enemy to find and interfere with the signal. This way the signal could be encoded across a broad spectrum. The difficulty would be in synchronizing the transmitter and the receiver, so they would be set at the appropriate frequency at all times. She met her neighbour, the avant-guard musician and composer George Antheil at a party. He had been working on automated control of musical instruments, including his music for Ballet Mécanique which involved synchronizing his melodies across twelve player pianos (or pianolas)! Is that not an excellent example of the wonderous region where art and science intersect? This was the answer. Together they developed Hedy's frequency-hopping idea, encorporating George's technology for synchronizing pianolas, and on the 11th of August, 1942, US Patent Number 2,292,387 for the "Secret Communications System" was granted to Antheil and to “Hedy Kiesler Markey”, which was her married name at the time. This early version of frequency hopping used a piano-roll to change among 88 frequencies (like the keys on a piano). Though the US navy did not adopt the method until 1962 (during their blockade of Cuba), and there other patents and inventors whose work contributed the modern methods, today, we recognize Hedy Lamarr as an important pioneer of wireless technology! Lamarr's and Antheil's frequency-hopping idea serves as a basis for modern spread-spectrum communication technology, such as Bluetooth, COFDM (used in Wi-Fi network connections), CDMA (used in some cordless and wireless telephones) and 4G LTE communications. You are probably using a device right now which relies on these ideas.

In the print, I show a portrait of Hedy in 1941, along with Fig.4 from Lamarr and Antheil's patent, which relates to the use of the piano roll. Below this, I show a diagram of how the modern the frequency-hopping code division multiple access (FH-CDMA) scheme works. The wide square wave labelled 'Data' is a signal to be encoded, with pulse width Tb. 'PRBS' means pseudo random binary sequence. It's the way the changes in frequency are introduced and plays the role of the piano roll today. It runs at a much higher rate than the data to be transmitted, with pulse width Tc. Data for transmission is combined via bitwise XOR (exclusive OR) with the faster code. This means that that if the two waveforms, the data and the PRBS are unequal, the transmitted signal (labelled Tx) will be high. Otherwise the transmitted signal will be low. The transmitted signal is spread across a spectrum of frequencies by a factor determined by the ratio of the two pulse widths; the bandwidth is increased by a factor of Tb/Tc. Since the PRBS, known as the "pseudo-noise" (PN) code can be can be reproduced in a deterministic manner by the intended receiver (which is equivalent to reproducing the imaginary piano roll), it can decode the signal. This spread spectrum encoding is at the heart of all our contemporary telecommunications and is only possible using the kind of frequency hopping that Hedwig Kiesler, also known as Hedy Lamarr, invented.


Tuesday, March 25, 2014

Inspired by Science on the Etsy Blog

Inspired by Science on The Etsy Blog


The Etsy blog just posted Karen Brown's article featuring 5 Etsy artists who are inspired by science, including me!

Lise Meitner
Lise Meitner and Nuclear Fission Linocut History of Physics by minouette

 

“I think the idea that art and science are separate is unfounded,” says print maker Ele Willoughby of minouette. “It takes creativity to be a good scientist and experimentation to be a good artist.” In her Etsy shop, Ele explores art and science through a series of portraits of scientists inspired by the bi-monthly challenges of the Mad Scientists of Etsy team. “I love hearing from parents who want to inspire young children with portraits of scientific heroes or heroines,” she says.

There are some fabulous artists in that inspiring intersection of art and science, and several of my prints included.

https://blog.etsy.com/en/2014/inspired-by-science/

Thursday, March 20, 2014

Shoot, the Canon version

The other recent custom order was inspired by my 'Shoot' linocut showing a vintage Leica M6 and its reflection, which I made for RJH. By a strange coincidence, one of my brother's buddies found it online while seeking actual vintage cameras, without realizing I was the OB's sister. He asked me to create a similar linocut, featuring a camera he does own (unlike the Leica M6, which would bust most budgets) - the 1973 Canon FTb. So, I made 'Shoot - Canon FTb':

Shoot - Canon FTb