Test Tubes, Ion Propulsion, R.H. Goddard

Irregularly shaped, large glass tube with one closed, round end and three smaller diameter tubes projecting from other end in prong fashion, the two outer tubes at a 45 degree angle from the axis, the middle tube projecting straight and with glass ball fused on end; the two outer tubes each with two hollow copper tubes projecting from lumps of hardened black sealing wax or ceramic at their tops; steel clamps around each set of these copper tubes, each clamp with two screws; two additional thin glass tubes projecting from other side of larger, main tube and joined together, as a cornered U-shape, on the side of the main tube; glass petcock on upper side of one of tube closest to the three-pronged tubes in front; another glass petcock on upper side of smaller broken-off piece of glass tubing with black sealing wax or ceramic on one end and glass petcock in middle; copper-colored wire mesh cylinder inside larger tube near three-pronged end; larger tube, broken off under this mesh cylinder.