Estimated Date: 1899
Description: 8” tube with 1.25” shield at one end, other has short curve 0.75”. The shield has a mount for a rod for some sort of electrical connection to the 3/8” tube. There is also a notch at the other end. An obturator closes off 0.5” hole at end, which has a sharp edge and two prongs. Size on the shield is #284, also inscribed ESI Co. Rochester, NY.
Reference 1: 33