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Thomas H. Cullen

From Wikipedia, the free encyclopedia

Thomas Henry Cullen
ThomasHCullen1916.jpg
Member of the U.S. House of Representatives
from New York's 4th district
In office
March 4, 1919 – March 1, 1944
Preceded byHarry H. Dale
Succeeded byJohn J. Rooney
Member of the New York Senate
from the 3rd district
In office
January 1, 1899 – December 31, 1918
Preceded byFrank Gallagher
Succeeded byPeter J. McGarry
Member of the New York State Assembly
from the Kings County, 3rd district
In office
January 1, 1896 – December 31, 1898
Preceded byJohn F. Houghton
Succeeded byJames J. McInerney
Personal details
Born(1868-03-29)March 29, 1868
Brooklyn, New York
DiedMarch 1, 1944(1944-03-01) (aged 75)
Washington, D.C.
Resting placeHoly Cross Cemetery
40°38′49″N 73°56′18″W / 40.64690°N 73.93830°W / 40.64690; -73.93830 (Holy Cross Cemetery)
Political partyDemocratic Party
Alma materSt. Francis College

Thomas Henry Cullen (March 29, 1868 – March 1, 1944) was an American politician from New York.

YouTube Encyclopedic

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  • ✪ Restore Silver with Electrochemistry 2017
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Transcription

Greetings fellow nerds. In this video we're going to restore tarnished silver using electrochemistry. First i need to issue a warning to any silver collectors, coin collectors or antiques dealers. Artificial chemical alteration of silver is very poorly received by the collector community in general. Do not perform this on any pieces that have any historical, numismatic or other value beyond the spot price of the silver metal itself. Our objective in this video is to explore the science. Anyway I made s silver restoration video back in 2009. I personally really liked it and have always wanted to redo it but using a modern 4k resolution camera as opposed to the really low end 720p camera i had back then. So let's get started restoring silver by electrochemistry in 2017. So first we need to make our restoration solution. We start with 200mL of water and add to it 20g of table salt and 10g of baking soda. Stir for about 5 minutes. It won't all dissolve but that's acceptable. It also helps to heat up the solution so it works faster during the restoration step. Now get a shallow tray with some aluminum foil and pour in our restoration solution to cover it. This actually works best with an all aluminum tray but i'm using foil so i can show you the chemistry. Let me zoom in for a better look. And here is our badly tarnished silver coin. Technically it's a silver round but the chemistry is the same. Now putting it into the solution by itself nothing will happen. We need an electrical connection for this to work. So let me put it on top of the aluminum foil to connect them. And there we go. I'm not timelapsing this. This is really happening that fast. And that is our restored silver coin. Let me do it again this time with a deeply tarnished silver coin. This will take a lot longer but it will still work. So what's happening? The colored tarnish on the silver is actually silver sulfide formed by reaction with small amounts of hydrogen sulfide and oxygen in the air. In the solution we set up a basic electrochemical cell. The aluminum foil is the anode and is oxidized in the alkaline solution releasing electrons. Normally these just go to making hydrogen gas but if we touch the silver to it then the electrons go into the silver. The silver behaves as the cathode and reduction occurs. The silver sulfide is converted back into silver metal and the sulfide ions go into solution. Overall we're transferring the sulfide from the silver to the aluminum. Now this works so well with aluminum because it has a much lower reduction potential than silver sulfide. So it's strong enough to force the back reaction of converting silver sulfide back into silver metal. So you might be asking what would happen if we tried a metal other than aluminum. Let me try again this time using nickel metal. Nickel has a much higher reduction potential than aluminum. In fact it's even higher than silver sulfide so as you can see nothing happens. The oxidation of nickel just isn't strong enough to force the reduction of silver sulfide. Let me try it again now this time using a strip of nickel in which we've plated zinc metal. The upper end of the stripe is still nickel metal. Now zinc has a lower reduction potential than silver sulfide so this should work. But to make this experiment more interesting i'm going to put the tarnished silver on the nickel end. Interestingly enough it's still working. This emphasizes the electrical nature of this experiment. The zinc is being oxidized by the solution as usual but the electrons travel through the nickel strip and into the silver where the reaction takes place. The nickel itself doesn't do anything but is the conductor for the electrons. Now let's take this a step further. If this is all about pushing electrons, then we should be able to force the reaction forward with a battery. A battery provides its own power and can push reactions that aren't favorable on either electrode. So here i am zoomed in onto a heavily tarnished coin and i'm attaching the negative terminal of the battery to it. Now all we need to do is touch the positive terminal to the solution and complete the circuit. The battery will rip electrons out of the copper wire and force them into the silver. This should be much faster since we're using a six volt battery pack. Far greater voltage than the lowly 1.6 volts of the aluminum. Ready. 3..2..1.. That was over in less than 2 seconds. Let's see that again. Interestingly enough the reduction wave starts nearest the positive wire, the anode, and moves away. Even if we do it on the same side the effect is dependent on the anode wire position. This is because the silver sulfide closest to the anode is the most strongly polarized and is reduced first. Once that's reduced the electrons go to the next most easily reduced silver sulfide which is slightly less polarized a little further away. This effect repeats and gives us this wave. So that was the restoration of silver using electrochemistry. I hope you enjoyed my video. And let me know if you think i should redo any other old video in modern high quality. Special thank you to all of my supporters on patreon for making these science videos possible with their donations and their direction. If you are not currently a patron, but like to support the continued production of science videos like this one, then check out my patreon page here or in the video description. I really appreciate any and all support.

Life

Thomas H. Cullen (1903)
Thomas H. Cullen (1903)

Born in Brooklyn, Cullen attended the local parochial schools, and graduated from St. Francis College in 1880. He engaged in the marine insurance and shipping business.

Cullen was a member of the New York State Assembly (Kings Co., 3rd D.) in 1896, 1897 and 1898.

He was a member of the New York State Senate (3rd D.) from 1899 to 1918, sitting in the 122nd, 123rd, 124th, 125th, 126th, 127th, 128th, 129th, 130th, 131st, 132nd, 133rd, 134th, 135th, 136th, 137th, 138th, 139th, 140th and 141st New York State Legislatures.

He was a delegate to the 1912, 1916, 1920, 1924, 1928 and 1932 Democratic National Conventions; and a member of the New York State Commission for the Panama–Pacific International Exposition in 1915.

Cullen elected as a Democrat to the Sixty-sixth and to the twelve succeeding Congresses and held office from March 4, 1919 until his death in Washington, D.C. in 1944; interment was in Holy Cross Cemetery, Brooklyn.

See also

References

  • United States Congress. "Thomas H. Cullen (id: C000970)". Biographical Directory of the United States Congress.
  • Thomas H. Cullen at Find a Grave
  • State of New York at the Panama-Pacific International Exposition, San Francisco, California, 1915 (Albany, 1916; pg. 27)
New York Assembly
Preceded by
John F. Houghton
New York State Assembly
New York County, 3rd District

1896–1898
Succeeded by
James J. McInerney
New York State Senate
Preceded by
Frank Gallagher
New York State Senate
3rd District

1899–1918
Succeeded by
Peter J. McGarry
U.S. House of Representatives
Preceded by
Harry H. Dale
Member of the U.S. House of Representatives
from New York's 4th congressional district

1919–1944
Succeeded by
John J. Rooney
This page was last edited on 9 May 2019, at 09:23
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