用铁丝扭成，套有瓷管，有大小之分。可用以支撑灼烧坩埚，小蒸发皿加热时也可以用。坩埚放置时坩埚底应横着斜放在三个瓷管中的一个瓷管上。
这种破损本身是密西西比三角洲水下有大量的泥崩造成的结果，在遏制供应量中发挥了比生产设施损坏还要大的作用。
This damage was itself the result of huge underwater mudslides in the Mississippi Delta and played a greater role in curtailing supply than did damage to production facilities.
三角洲平原分流河道沉积底部泥砾较发育，沼泽沉积中发育植物根和褐煤沉积；三角洲前缘河口砂坝沉积物粒度较平原决口扇粗。
Mud gravel is often found in the base of distributary channel sediment, plant root and lignite often develop in the swamp sediment.
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