What is an inkwell

Ink bucket is a carpenter's tool, looks a little like a boat, more than 20 centimeters long, carpenters sometimes have to draw a straight line on the wood, so that when according to the wood, according to the straight. But drawing with a ruler is too much trouble, so use the bucket. There was a head at the back of the inkwell, and it was pulled out to be a black thread, which was usually soaked in the inkwell, and there was ink in the inkwell, so one person fixed the head to one end of the wood, and the other person, straightened the thread, and then fixed the thread by making it straighter than it should be. At this point, the thread is pulled upward a little, and when it is released, it is flicked just like that, and a straight ink mark is left on the wood, and then the wood is accordingly straightened. As for the warding off evil spirits aspect, I don't know. My grandfather was a carpenter when he was young, and he used to play it a lot when he was little, but now it's rare.