Figure 5.

Schematic arrangement of the high vacuum, argon gas purification and handling, and pressure measurement system.

A. High-purity argon gas supply cylinder.

B. Cryogenic traps, liquid oxygen.

C. Inconel tube (packed with copper metal and with copper oxide) in furnace.

D. Cryogenic traps, liquid nitrogen.

E. Vacuum gauge, cold cathode type.

F. Vacuum gauge, thermocouple type.

G. Oil diffusion pump.

H. Dial type manometer, lowest subdivision of scale: 1 mm Hg (torr).

J. Flexible loop of tubing (Inconel, 3.18 mm o.d. × 0.20 mm wall) for connecting to the aluminum-point cell.

V. Valve, bellows type.