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    You are at:Home»Science & Technology»Inventions»May 25, 1953: US Conducts its Only Nuclear Artillery Test Shot
    Inventions

    May 25, 1953: US Conducts its Only Nuclear Artillery Test Shot

    Major DanBy Major DanMay 25, 2017Updated:October 12, 2021No Comments5 Mins Read
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    nuclear artillery test

    A Brief History

    On May 25, 1953, the United States Army conducted a live nuclear artillery test shot, the only time the US ever conducted such a test.

    Digging Deeper

    Conducted in the Nevada desert (Nevada Test Site, later renamed the Nevada National Security Site) the test firing and detonation of a live nuclear (fission type) bomb fired from a cannon was called by the code-word Upshot-Knothole Grable.  One of only 4 “gun” type atom bombs ever detonated by the US, the warhead was constructed similar to the “Little Boy” bomb that obliterated Hiroshima in 1945.  It used 2 chunks of uranium at separate ends of a pipe like “gun” that were forced together at high speed and pressure by an explosive charge, creating a critical mass and resulting in the nuclear explosion.  Yield of the artillery fired shell was 15 kilotons, about the same as the Hiroshima bomb.

    Considering that the 11 inch bore cannon (280 mm) could only lob the shell 11,000 yards (6.25 miles) this made the blast a bit close for comfort for the gun crew.  Since presumably the M65 Atomic Cannon, nicknamed “Atomic Annie,” would not be the forward-most US troops and equipment, this means friendly troops would be even closer to the blast if the weapon was used in battle.  The test shot was detonated about 524 feet above ground level, lower than nukes were usually detonated at that time.  The nearness to the ground resulted in a sort of double wave pressure effect that caused a rethinking of employment of nuclear warheads.  (Note: The other type of nuclear fission atom bombs are the “implosion” type that use a hollow sphere of plutonium that is collapsed on itself by surrounding high explosives.)

    The Atomic Cannon was not a particularly good idea, as the 83.3 ton weight of the cannon and carriage was not very mobile and could crush most bridges.  Only 20 of the big guns were built, and were fielded in 1953 in Europe and South Korea.  Obviously, the enemy would keep track of wherever these guns were on the battle field and they would become a primary target.  The US Army kept shuffling the guns around in an effort to keep the enemy guessing where they were, but it is likely the enemy knew where the giant guns were, anyway.  Despite the lack of realistic usefulness, the guns stayed in service until 1963 when they were superseded by 155 mm and 203 mm (8 inch) artillery nuclear shells that could be fired from any cannons of those calibers, making it impossible for the enemy to know which gun tube might be launching a nuke.

    Other artillery (we are not counting battlefield rockets here) gun fired nuclear capable weapons for which nuclear warheads were made included the 16 inch battleship guns, and the aforementioned 155 mm and 203 mm artillery pieces that came in both towed and self-propelled forms.

    Weapons designers with a full-scale cut-away model of the W48 155mm shell

    The United States military had a peak number of 31,255 nuclear warheads during the Cold War, a stupendous number that we could never come close to needing!  As of 2017, it is estimated that the United States maintains a stockpile of about 6800 nuclear warheads, and the Russians have a stockpile of about 7000 nuclear warheads.  The next country with the most nukes is France, with 300.  A total of 9 countries are believed to have nuclear weapons ready to use.

    The USSR and United States nuclear weapon stockpiles throughout the Cold War until 2015, with a precipitous drop in total numbers following the end of the Cold War in 1991.

    Question for students (and subscribers): Does the U.S. need to maintain such a large number of nukes?  How many do we need to keep the Russians or anyone else afraid of our retaliation, so as to keep other countries from using theirs?  Should nuclear weapons be banished from the Earth?  Is such a ban even possible?  Please share your opinions on these subjects in the comments section below this article.

    If you liked this article and would like to receive notification of new articles, please feel welcome to subscribe to History and Headlines by liking us on Facebook and becoming one of our patrons!

    Your readership is much appreciated!

    Historical Evidence

    For more information, please see…

    Operation Upshot/Knothole Nuclear Testing Program on DVD – Operation Upshot/Knothole Fission and Fusion Atomic Weapon Testing.  DVD.

    The featured image in this article, the mushroom cloud from Upshot–Knothole Grable, with the cannon it was fired from in the foreground, is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.

    You can also watch a video version of this article exclusively at https://thearmchairhistorian.uscreen.io/programs/us-conducts-its-only-nuclear-artillery-test-shot1_1mp4-f1813f on Armchair History TV.

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    Major Dan

    Major Dan is a retired veteran of the United States Marine Corps. He served during the Cold War and has traveled to many countries around the world. Prior to his military service, he graduated from Cleveland State University, having majored in sociology. Following his military service, he worked as a police officer eventually earning the rank of captain prior to his retirement.

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