In illo tempore…

Tikz test

Sunday, August 18 2019 at 10:03 PM CDT

Looks like some tweaking is needed for html export of code blocks. The latex code should be colorized and in a monospace font.

test.png

\documentclass[border=10pt,tikz]{standalone}
\usepackage{tikz}
\usetikzlibrary{intersections,calc,angles,quotes,positioning}
\begin{document}

\begin{tikzpicture}
  %% \draw[help lines,line width=0.1pt]  (0,0) grid (5,5);

  \coordinate [label=left:$A$] (A) at (0,0);
  \coordinate [label=right:$B$] (B) at (4,3);
  \coordinate [label=right:$C$] (C) at (4,0);

  \draw (A) -- (B) -- (C)
    pic [draw=green!50!black, fill=green!20, angle radius=.8cm, "$\alpha$"] {angle = C--A--B};
  \draw (A) -- (B) -- (C)
    pic [draw=green!50!black, fill=green!20, angle radius=.8cm, "$\beta$"] {angle = A--B--C};

  \draw (C) +(-.25,0) |- +(0,.25);

  \draw [name=AB] (A) -- node[above]{$c$} (B);
  \draw [name=BC] (B) -- node[right]{$a$} (C);
  \draw [name=CA] (C) -- node[below]{$b$} (A);

\end{tikzpicture}

\end{document}

Rhode Island Greening

Thursday, July 11 2019 at 9:48 PM CDT

RHODE ISLAND GREENING (also known as Burlington, Ganges, Green Winter Pippin) is an historic old American apple that originated about 1650 at Green’s End, Newport, Rhode Island. At the end of the 19th century, it was one of New York’s most important commercial varieties, surpassed only by Baldwin. It is a vigorous and long-lived tree but does well in the South only at higher altitudes. Pollen sterile. It is tender, crisp, juicy and quite tart, an excellent winter keeper and one of the best cooking apples available. It is a very fine substitute for the more commonly known Granny Smith. The fruit is large, uniformly round in shape and flattened on the ends. The dark, waxy green skin turns a greenish-yellow when fully ripe. It ripens from September to October and keeps until February or longer. — Albemarle Cider Works

Artist Steadman, Royal Charles, b. 1875
Scientific name Malus domestica
Common name apples
Variety Rhode Island Greening
Physical description 1 art original : col. ; 17 x 25 cm.
Specimen 88085
Year 1916
Notes on original Apple purchased in market
Date created 1916-03-30
Rights Use of the images in the U.S. Department of Agriculture Pomological Watercolor Collection is not restricted, but a statement of attribution is required. Please use the following attribution statement: "U.S. Department of Agriculture Pomological Watercolor Collection. Rare and Special Collections, National Agricultural Library, Beltsville, MD 20705"

Haeckel's Ascidiae

Saturday, June 29 2019 at 7:39 PM CDT

1024px-Haeckel_Ascidiae.jpg

Figure 3: Source.

Bottle-shaped Vase, 1889-1896

Friday, June 28 2019 at 10:02 PM CDT

callowhill-bottle-shaped-vase.jpg

The Inner Ring

Friday, June 28 2019 at 6:30 PM CDT

“The Inner Ring” was the Memorial Lecture at King’s College, University of London, in 1944.

The Inner Ring

C.S. Lewis

May I read you a few lines from Tolstoy’s War and Peace?

When Boris entered the room, Prince Andrey was listening to an old general, wearing his decorations, who was reporting something to Prince Andrey, with an expression of soldierly servility on his purple face. “Alright. Please wait!” he said to the general, speaking in Russian with the French accent, which he used when he spoke with contempt. The moment he noticed Boris he stopped listening to the general who trotted imploringly after him and begged to be heard, while Prince Andrey turned to Boris with a cheerful smile and a nod of the head. Boris now clearly understood—what he had already guessed—that side by side with the system of discipline and subordination which were laid down in the Army Regulations, there existed a different and a more real system—the system which compelled a tightly laced general with a purple face to wait respectfully for his turn while a mere captain like Prince Andrey chatted with a mere second lieutenant like Boris. Boris decided at once that he would be guided not by the official system but by this other unwritten system.

1893: Nocturne, Railway Crossing, Chicago

Friday, June 28 2019 at 6:06 PM CDT

hassam-nocturne-1893.png

Figure 5: Childe Hassam

From the Museum of Fine Arts, Boston via watercolourworld.org.

Flying across New Mexico, 1922

Thursday, June 27 2019 at 5:51 PM CDT

Kelly-Macready-Fokker-T2-SI-98-15780.png

Figure 6: Kelly & Macready.

In 1922, Army Lieutenants Oakley G. Kelly and John A. Macready attempted to fly a Fokker T-2 nonstop across the United States from California to New York. The plane was modified to carry extra fuel, and the extra weight caused some hair-raising moments. In their article “The 2000 Mile Flight of the Army Fokker T2” in the January 1, 1923, issue of Aviation Week, the authors describe their flight over New Mexico:

As the country around Tucson was approached, it became a continuous struggle with the climb at practically the absolute ceiling of the airplane in order to cross over the high passes, mountains, and elevations, the passing of each obstacle being doubtful. The atmosphere was very rough and bumpy, with numerous air currents, which would raise the airplane a hundred feet or more at a time, sometimes possibly two or three hundred, and then let it down quickly even though the same position or angle of climb of the airplane was maintained. It many times appeared that the T2 would not be able to get over these high areas, but apparently just as the summit was reached, one of the air currents coming over the high elevation would raise the airplane just enough to clear the top.

Prunus persica: ‘Mayflower’

Thursday, June 27 2019 at 4:54 PM CDT

Steadman-Prunus-persica-Mayflower.jpg

Haeckel’s Cystoidea

Saturday, June 22 2019 at 2:06 PM CDT

cystoidea.jpg

Ernst Haeckel (1834–1919), Kunstformen der Natur (1904), plate 90: Cystoidea.

New weapons, old medicine

Saturday, June 22 2019 at 1:57 PM CDT

From Simon Winchester’s The Professor and the Madman:

Here was an inescapable irony of the Civil War, not known in any conflict between men before or since: the fact that this was a war fought with new and highly effective weapons, machines for the mowing down of men—and yet at a time when an era of poor and primitive medicine was just coming to an end. It was fought with the mortar and the musket and the minié ball, but not yet quite with anesthesia or with sulphonamides and penicillin. The common soldier was thus in a poorer position than at any time before: he could be monstrously ill-treated by all the new weaponry, and yet only moderately well-treated with all the old medicine.

A cyanotype of Cystoseira fibrosa

Friday, June 21 2019 at 10:52 PM CDT

From Anna Atkins’ 1843 "Photographs of British Algae" using cyanotypes (the blueprint process). There’s more at https://publicdomainreview.org/collections/cyanotypes-of-british-algae-by-anna-atkins-1843/

anna-atkins.jpg

Figure 9: Cystoseira fibrosa