Patent for a new and improved caster. This design consists in "the combination of a caster having an elongated stem provided with upper and lower annular supporting-shoulders, a poison-receptacle having a central opening in its bottom to receive the stem and provided with a central vertical tube having a top provided with an opening receiving the stem, said receptacle being supported by the lower shoulder, and a concavo-convex shield supported by the upper shoulder and arranged over the mouth of the receptacle and provided with a filling-orifice and having a pivoted cover" (lines 82-93).