c-18

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RSC Fusil Semi-Automatique Mle1917

Designed by Ribeyrolles, Sutter, and Chauchat - made by the Manufacture d’Armes de Tulle in France c.1917~18.
8x51mmR Lebel five-round en-bloc clip, gas-operated semi-automatic, loaded from the bottom.

Made with several Lebel parts, the RSC Mle1917 was the first semi-automatic military rifle to be mass-issued and used during a major conflict, namely World War one. It was a far cry from the revolutionary designs of the French rifle trials of the early 20th century, but it was decently reliable and provided a lot more firepower than the old Lebel Mle1886.

anonymous asked:

So if the President in 12.08 L.O.T.U.S. is white, does that mean 2013-2016 were irl-divergent w/ a white Pres., or is this guy the Pres. for 2017-2020, drawing undertable parallels? B/c in 7.18 Time After Time, Dean tells Ness about a black Pres.

Oooh anon you’ve got a good point there. I have no idea what year/timeline spn is on tbh…but i’d guess 2017-2020?? \(:/)/ 

3

A famous experiment which changed organic chemistry: purple benzene. 

Crown ethers are an unusual series of molecules that have the ability to complex small cations, notably alkali metals such as lithium, sodium and potassium. These cyclic molecules, upon complexing a cation, can allow a salt to go into organic solvent that otherwise wouldn’t. This makes reactions that are otherwise impossible accessible.

Charles John Pedersen (October 3, 1904 – October 26, 1989) was a pioneer of this field of chemistry. He was an American organic chemist best known for describing methods of synthesizing crown ethers.  He shared the Nobel Prize in Chemistry in 1987 with Donald J. Cram and Jean-Marie Lehn.

A good example is how 18-crown-6 (shown above) can help potassium permanganate (a beautiful purple oxidizing agent based on manganese (VII)) go into organic solvent. Normally, you can only get permanganate into very polar solvents (as seen on the first pics where the benzene dissolves 0% of the permanganate), but when adding 18-crown-6, it allows the permanganate ion to go into solution as well forming a beautiful purple solution as seen above.

An inspiring article, what is worth to read about crown ethers, by Charles J. Pedersenhttp://pubs.acs.org/doi/abs/10.1021/ja01002a035