Last month, we were able to complete one of the last major steps in the conservation of USSMonitor’s two XI-Inch Dahlgren shell guns: boring concretion out of the barrels. Material Culture Specialist Hannah最近展示了我们在这个过程中发现的东西（煤炭确实很酷），但是为什么要清理枪口呢？无论如何，您实际上如何去做呢？
“为什么”有几块。我们对残骸的考古知识有好处，但是我们的主要关注点是使枪支保持良好状态。监视器的枪是用铁制成的，特别是用灰色铸铁制成的。灰铸铁不是100％纯铁。它含有大约4％的碳，而碳则是被围绕它的金属锁定的石墨片的存在 - 图片铅笔铅的小剃须，您不会太远。
历史上充满了与材料创新相关的年龄：石器时代，青铜时代和铁器时代。我们目前处于塑料年龄。塑料在我们的日常生活中发生了很大变化。塑料一直在我们周围。它们在我们房屋中的每件电气中，穿着我们穿的衣服，家具和食物包装。
这意味着，作为历史对象的看护人，博物馆必须考虑塑料材料在我们的收藏中持续多长时间。我们专注于我们必须做的事情和学习以照顾塑料物体。我们还研究塑料，以便以更好的方式存储它们。这是一件复杂的事情。塑料不是简单的材料，一种适合一种材料可能会损坏另一种材料。一些塑料的时间比其他塑料更长，因此我们对它们有更多的了解。我们可以看到他们的年龄。对于其他塑料，我们可以猜测它们如何根据其行为和化学生存（或不生存），而其他塑料则是一个巨大的问号。
The Conservation team recently bored USSMonitor的2 XI-inch达利大炮。这是一个巨大的step in the objects’ treatment. It came from a need, but also required the right expertise, a TON of planning, donor funding, and specially crafted parts to make it happen. This task was completed for absolutely no archaeological reason. It needed to happen to conserve the artifacts and, therefore, it happened, but that doesn’t mean that archaeological interpretation didn’t benefit from the project.
To accomplish “archaeological investigation” of the concretions which came out of the guns’ bores, we set up a screening station at which the screeners – me, and the poor fools I tricked into helping me (our CEO Howard, our intern Christy, and our volunteer Heidi) – broke up the concretion into smaller bits of concretion until it fit through the screen and we could say with fair certainty that there were no artifacts left inside. This is a standard archaeological practice called sifting. What is maybe unique about our situation, is that since everything belongs to NOAA, we don’t get rid of the dirt and rock after its sifted, we bury it and save it in case there are techniques that it will be useful for in the future. No, I won’t tell you where we bury it. Actually, even I don’t know where, so I couldn’t tell you if I wanted to.
It was a crisp winter morning, the year newly minted as it was only January 2nd. I had just finished preparing all of our samples to run on our old, but usually reliable, ion chromatography (IC) unit. (Aside: The IC is vital in measuring when the desalination treatments of USSMonitorobjects are complete.)
截至1月1日，我们的IC单位用光了预防性维护覆盖范围（阅读保修）。IC是如此古老，很难找到零件，我们无法购买新的预防性维护政策。我们的IC在过时和不活动的悬崖上保持平衡。
今天的问题似乎是一个简单的问题 - 达尔格伦壳枪多长时间？如我所说之前，，，，I am designing a set of drilling equipment to clean inside the XI-Inch Dahlgrens recovered from USS Monitor, and as part of that I need to establish parameters for actually using the drilling equipment. Well, one very important parameter to know ishow far in can you drill? There are two ways to answer that question: you either need to knowexactly在开始之前，孔的深度有多深，或者一直将钻头推入枪直到撞到金属。鉴于后者的选项可将闪亮的新凹槽切入孔的后部，因此我喜欢瞄准前者。
Fortunately, guns from the 19Th世纪经常有政府的军械记录或专利图纸，这些图纸或多或少具有完整的维度，而达尔格伦·贝壳枪（Dahlgren Shell Guns）尤其具有专利图和多个武器图纸。不幸的是，它们都不匹配。该专利图给出了所有达尔格伦壳枪的标准比率，该枪支应为12个口径，这意味着XI英寸枪的长度应为132英寸。XI英寸达尔格伦（Dahlgren）或大约11.93个口径的军械图董事会的孔长为131.2英寸。此外，我们都有军械图案图纸和检查图板，尽管它们之间的钻孔长度相同，但粉末室的测量值不同。
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