Ion Propulsion Test Tube, R. H. Goddard

Glass tube with five smaller adjoining tubes projecting from it; smaller tubes of smaller diameter and at different distances from each other, three evenly spaced, adjoining to middle of main tube and jutting out out right angles, the other two jutting out at 45 degree angles, the one at the bottom facing downwards and the other, at top, facing upwards; one strand of copper wire strung throughout part of main, larger tube and leading out to the second from the bottom smaller tube or arm and protruding from red wax top of smaller tube for about 12 inches; copper wire rod inside top part of main tube with about 3 inches of this rod protruding through red wax topping of other end of main tube, the top part of this main tube of shorter diameter than rest of tube; short, 1 1/8 inch length of chrome colored tube inside middle of main tube with copper wire strand leading from middle of the chrome colored tube and forming a spring inside one of the adjacent connecting glass tubes or arms, this wire protruding to about 11 inches from wax top on this connecting tube; main tube opened at one end (opposite to end with hardened wax topping). Some brown internal smudges inside top of main tube, but otherwise exhibitable.