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“There are 10 kinds of people in the world: those who understand binary numerals, and those who don’t”*…

 

Guide to Computing

From a collection of vintage photos of computing equipment by “design and tech obsessive” James Ball…

Guide to Computing

More at Docubyte

[TotH to Kottke]

* vernacular joke, as invoked by Ian Stewart in Professor Stewart’s Cabinet of Mathematical Curiosities

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As we rewind, we might spare a thought for Christian Goldbach; he died on this date in 1764.  A mathematician, lawyer, and historian who studied infinite sums, the theory of curves and the theory of equations, he is best remembered for his correspondence with Leibniz, Euler, and Bernoulli, especially his 1742 letter to Euler containing what is now known as “Goldbach’s conjecture.”

In that letter he outlined his famous proposition:

Every even natural number greater than 2 is equal to the sum of two prime numbers.

It has been checked by computer for vast numbers– up to at least 4 x 1014– but remains unproved.

(Goldbach made another conjecture that every odd number is the sum of three primes; it has been checked by computer for vast numbers, but also remains unproved.)

Goldbach’s letter to Euler (source, and larger view)

(Roughly) Daily is headed into a Thanksgiving hiatus; regular service will resume when the tryptophan haze clears…  probably around Monday, November 26.  Thanks for reading– and have Happy Holidays!

Written by LW

November 20, 2018 at 1:01 am

“It takes just one big natural disaster to… remind us that, here on Earth, we’re still at the mercy of nature”*…

 

ca_1116NID_Dome_Tent_online_CC_cropped

An 72-meter ice core drilled in the Colle Gnifetti Glacier in the Swiss Alps entombs more than 2000 years of fallout from volcanoes, storms, and human pollution. NICOLE SPAULDING/CCI FROM C. P. LOVELUCK ET AL., ANTIQUITY 10.15184, 4, 2018

 

Ask medieval historian Michael McCormick what year was the worst to be alive, and he’s got an answer: “536.” Not 1349, when the Black Death wiped out half of Europe. Not 1918, when the flu killed 50 million to 100 million people, mostly young adults. But 536. In Europe, “It was the beginning of one of the worst periods to be alive, if not the worst year,” says McCormick, a historian and archaeologist who chairs the Harvard University Initiative for the Science of the Human Past.

A mysterious fog plunged Europe, the Middle East, and parts of Asia into darkness, day and night—for 18 months. “For the sun gave forth its light without brightness, like the moon, during the whole year,” wrote Byzantine historian Procopius. Temperatures in the summer of 536 fell 1.5°C to 2.5°C, initiating the coldest decade in the past 2300 years. Snow fell that summer in China; crops failed; people starved. The Irish chronicles record “a failure of bread from the years 536–539.” Then, in 541, bubonic plague struck the Roman port of Pelusium, in Egypt. What came to be called the Plague of Justinian spread rapidly, wiping out one-third to one-half of the population of the eastern Roman Empire and hastening its collapse, McCormick says.

Historians have long known that the middle of the sixth century was a dark hour in what used to be called the Dark Ages, but the source of the mysterious clouds has long been a puzzle. Now, an ultraprecise analysis of ice from a Swiss glacier by a team led by McCormick and glaciologist Paul Mayewski at the Climate Change Institute of The University of Maine (UM) in Orono has fingered a culprit…

536 chart

Learn what it was that challenged civilizations: “Why 536 was ‘the worst year to be alive’.”

* Neil deGrasse Tyson

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As we ruminate on resilience, we might spare a thought for Tetsuya Theodore “Ted” Fujita; he died on this date in 1998.  A meteorologist, he became known as “Mr. Tornado” for his work in understanding those severe storms and his development of (what’s now known as)  the Fujita scale to measure tornado intensity.

Thetsuya_Theodore_Fijuta source

 

 

Written by LW

November 19, 2018 at 1:01 am

“A measurement is not an absolute thing, but only relates one entity to another”*…

 

kilogram

 

Until now, [the mass of the kilogram] has been defined by the granddaddy of all kilos: a golf ball-sized metal cylinder locked in a vault in France [a replica of which is pictured above]. For more than a century, it has been the one true kilogram upon which all others were based…

Made of a corrosion-resistant alloy of 90 percent platinum and 10 percent iridium , the international prototype kilo has rarely seen the light of day. Yet its role has been crucial, as the foundation for the globally accepted system for measuring mass upon which things like international trade depend.

Three different keys, kept in separate locations, are required to unlock the vault where the Grand K and six official copies — collectively known as ‘‘the heir and the spares’’ — are entombed together under glass bell-jars at the International Bureau of Weights and Measures, in Sevres on the western outskirts of Paris.

Founded by 17 nations in 1875 and known by its French initials, the BIPM is the guardian of the seven main units humanity uses to measure its world : the meter for length, the kilogram for mass, the second for time, the ampere for electric current, the kelvin for temperature, the mole for the amount of a substance and the candela for luminous intensity.

Of the seven, the kilo is the last still based on a physical artifact, the Grand K. The meter, for example, used to be a meter-long metal bar but is now defined as the length that light travels in a vacuum in 1/299,792,458th of a second…

The metal kilo is being replaced by a definition based on Planck’s constant, which is part of one of the most celebrated equations in physics but also devilishly difficult to explain . Suffice to say that the update should, in time, spare nations the need to occasionally send their kilos back to Sevres for calibration against the Grand K. Scientists instead should be able to accurately calculate an exact kilo, without having to measure one precious lump of metal against another…

More of this weighty story at “The kilogram is changing. Weight, what?

* H.T. Pledge, Science since 1500

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As we muse on measurement, we might send well-calibrated birthday greetings to August Kundt; he was born on this date in 1839.  An astronomer-turned-physicist, he developed a method to measure the velocity of sound in gases and solids using a closed glass tube (now known as a Kundt’s Tube).

AugustKundt source

We might also spare a thought for another physicist, Niels Bohr; he died on this date in 1962.  A Danish physicist and philosopher, Bohr was the first to apply quantum theory to the problem of atomic and molecular structure, creating the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete, and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another– a model the underlying principles of which remain valid.  And he developed the principle of complementarity: that items could be separately analyzed in terms of contradictory properties, e.g., particles behaving as a wave or a stream. His foundational contributions to understanding atomic structure and quantum theory won him the Nobel Prize in Physics in 1922.

 source

 

“The cyclical rebirth of caste in America is a recurring racial nightmare”*…

 

griffith

Dorothy and Lillian Gish and D.W. Griffith at the White House, 1922. Library of Congress

 

The year 1915 marked the fiftieth anniversary of the end of the Civil War. Monuments to Confederate and Union heroes were being dedicated all over the country. Woodrow Wilson, a fan of Jim Crow laws, was president. He had allowed federal workplaces to segregate again.

Enter Thomas Dixon Jr., Wilson’s classmate from Johns Hopkins. A film had just been made of Dixon’s second novel, “the true story” of the South under Reconstruction. Would the president, he wondered, be interested in viewing it? (He would.)

“History written with lightning,” Wilson declared of The Clansman, the second film ever to be screened in the White House. It was an endorsement guaranteed to head off resistance from town censor boards charged with shutting down entertainment deemed unsuitable or incendiary to the public…

The Clansman was a silent movie with title cards. It depicted whites as victims and blacks as villains. Benevolent former masters were denied votes and subjugated by newly freed blacks taking over the country. In an early scene, black legislators sit at desks, shoeless and drunk, too busy stuffing their faces with fried chicken to work. The title card read: “An historical facsimile of the State House of Representatives of South Carolina in 1870.” South Carolina had been the first state to elect a majority-black legislature and that the card implied that the apish behavior depicted was historically accurate, too.

In a later scene, the white heroine (played by Lillian Gish) is threatened by a black man unable to contain his urge to “mongrelize” the white race. Before she is ravaged, a savior army rides in: The Ku Klux Klan. The title-card copy comes straight from the president’s five-volume History of the American People, published in 1902:

440px-wilson-quote-in-birth-of-a-nation

More of this sad story, and its aftermath, at “Hatred Endorsed by a President.”

* Michelle Alexander, author of The New Jim Crow: Mass Incarceration in the Age of Colorblindness

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As we ruminate on recurrence, we might send never-ending birthday greetings to August Ferdinand Möbius; he was born on this date in 1790.  A German mathematician and theoretical astronomer, he is best remembered as a topologist, more specifically for his discovery of the Möbius strip (a two-dimensional surface with only one side… or more precisely, a non-orientable two-dimensional surface with only one side when embedded in three-dimensional Euclidean space).  See ““It might help to think of the universe as a rubber sheet, or perhaps not.”

 source

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Written by LW

November 17, 2018 at 1:01 am

“That most potent of all sheets of paper, the ballot”*…

 

800px-The_County_Election,_Bingham,_1846

The County Election,” George Caleb Bingham, 1854.

 

Before there were paper ballots in America, there was the human voice. Per the viva voce system, a practice with roots in Ancient Greece, eligible voters would call out the names of their preferred candidates to a government clerk, who registered votes in a pollbook. Sometimes bodies would suffice: in Kentucky, until the early nineteenth century, some elections were decided by counting the number of supporters lined up on opposite sides of the road. In some colonies, people would cast their votes with corn and beans—corn for yea, beans for nay.

Though voting “by papers” gained in popularity during Colonial times, state governments made little effort to standardize ballots until the early nineteenth century. Ballots often required voters to write their preferred candidate’s name on a scrap of paper, which might only be counted if the name was legible and correctly spelled. By the end of the eighteen-twenties, the sheer number of elected offices became too much for a scribe to list, paving the way for the legalization of printed ballots provided by party workers and candidates themselves. As political parties grew and the lists of candidates became longer, the ballots began to resemble the timetables on railway tickets—hence the term “party ticket.”

Despite regulations in some states that required ballots to be printed in black ink on white paper, parties would use distinctive graphic layouts and production methods that allowed party enforcers to monitor voting by visually determining the allegiance of the voter…

On Election Day in nineteenth-century America, party enforcers actively sought out citizens to bribe or coerce. Campaigning often took place in the local taverns that doubled as polling locations. Votes could be bought with ready cash, a ladleful of rum, or even a set of plates. Party enforcers often employed a kidnapping strategy called “cooping,” in which drunk and indigent men were rounded up, locked away in a room until Election Day, and forced to visit polling sites to repeatedly vote for a candidate. Fake or counterfeit party ballots with some or all of the names of another party’s candidates were distributed to mislead the inattentive voter. When interrogated about election fraud, the infamous Boss Tweed once remarked that it wasn’t the ballots that rendered the result. It was the counters

Technological innovations have reshaped the secret-ballot system many times in the decades since. By 1920, gear-and-lever machines with privacy curtains were serving a growing, post-suffrage electorate as the official voting method in several states. From the late fifties to the early seventies, the struggle against discriminatory voting practices and a newly enfranchised youth population further increased the size of the electorate, creating a wider demand for punch-card voting machines, which allowed votes to be counted by a computer. In 2002, after the so-called hanging chad scandal of the 2000 Presidential election, federal funds helped spread the use of electronic voting machines that are still in use today

In this age of recrimination and recount, a look at the history of the ballot– with lots of fascinating pictorial examples: “This is what democracy looked like.”

* Philip Loring Allen

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As we fortify our franchise, we might recall that it was on this date in 1916 that Margaret Sanger, fresh back from a stint in the Raymond Street jail, reopened the Brownsville Clinic in Brooklyn, NY– the first birth control clinic in the U.S.  Sanger had been shut down and arrested before for obscenity (she offered a booklet called “What Every Young Woman Should Know,” explaining the female reproductive system and several contraceptive methods).  This time, the police leaned on her landlord to evict her, and the clinic closed almost as soon as it reopened.

Sanger (center) at the Brownsville Clinic

source

 

Written by LW

November 16, 2018 at 1:01 am

“The study of man is the study of his extensions”*…

 

magic-lantern_1_md

The magic lantern was invented in the 1600’s, probably by Christiaan Huygens, a Dutch scientist. It was the earliest form of slide projector and has a long and fascinating history. The first magic lanterns were illuminated by candles, but as technology evolved they were lit by increasingly powerful means.

The name “magic lantern” comes from the experience of the early audiences who saw devils and angels mysteriously appear on the wall, as if by magic. Even in the earliest period, performances contained images that moved—created with moving pieces of glass.

By the 18th century the lantern was a common form of entertainment and education in Europe. The earliest known “lanthorn show” in the U. S. was in Salem, Massachusetts, on December 3, 1743, “for the Entertainment of the Curious.” But the source of light for lanterns in this period—usually oil lamps—was still weak, and as a consequence the audiences were small.

In the mid 19th century, two new forms of illumination were developed which led to an explosion of lantern use. “Limelight” was created by heating a piece of limestone in burning gas until it became incandescent. It was dangerous, but produced a light that was strong enough to project an image before thousands of people, leading to large shows by professional showmen…

All about the entertainment sensation of its time at the web site of The Magic Lantern Society.  [TotH to friend and colleague RW]

And for a peek at the transition from the static images of the magic lantern to film-as-we-know-it, see “Putting Magic in the Magic Lantern.”

[image above: source]

Edward T. Hall, Beyond Culture

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We we watch with wonder, we might recall that it was on this date in 1926 that The NBC Radio Network, the first network in the U.S., was launched.  Carl Schlegel of the Metropolitan Opera opened the four-hour inaugural broadcast, which also featured Will Rogers and Mary Garden; it included a remote link from KYW in Chicago and was carried by twenty-two eastern and midwestern stations, located as far west as WDAF in Kansas City, Missouri.

NBC has been formed from assets already held by its parent, Radio Corporation of America (RCA) and other assets acquired from AT&T (which had been, up to that point, a pioneer in radio technology).  Crucially, as part of the reassignment permissions granted by the government, NBC was allowed to sell advertising.

NBC’s network grew quickly; two months later, on January 1, 1927, it was split into the Red and Blue networks.  And it quickly attracted competition:  the Columbia Broadcasting System (CBS) in 1927 and the Mutual Broadcasting System in 1934.  In 1942 the government required NBC to divest one of its networks; it sold off NBC Blue, which became The American Broadcasting Company (ABC).

200px-NBC_Red_Network source

 

 

Written by LW

November 15, 2018 at 1:01 am

“To suffer the penalty of too much haste, which is too little speed”*…

 

Johann-Sebastian-Bach

Pop and rap aren’t the only two genres speeding up in tempo in the breakneck music-streaming era: The quickening of pace seems to be affecting even the oldest forms of the art. Per research this weekend from two record labels, classical music performances of J.S. Bach have also gotten faster, speeding up as much as 30 percent in the last half century…

The fascinating details– and a hypothesis as to what’s going on– at “Even Classical Music Is Getting Faster These Days.”

*Plato

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As we pick up the pace, we might wish a harmonious Happy Birthday to Aaron Copland; the composer, writer, teacher, and conductor was born on this date in 1900.  Known to his peers and critics as “the Dean of American Composers,” his signature open, slowly-changing harmonies– e.g., in “Appalachian Spring“–  are typical of what many consider the sound of American music, evoking the vast American landscape and pioneer spirit.

220px-Aaron_Copland_1970 source

 

Written by LW

November 14, 2018 at 1:01 am

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