Detecting the Invisible
Sub-Surface Flaws are Revealed and Their Location and Size Determined by Non-Destructive Inspection with Supersonic Frequencies Formerly Used to Trace Submarines. Electronic Mine-Detectors, Also War Products, May be Ideal for Scouting Pipe and Cable Laying Projects
John Markus, Keith Henney
Ion Exchange
Purification of Liquids and Gases, Selective Recovery of Valuable Materials, and the Removal of Undesirable Substances from Chemical Compounds, are Problems that Often may be Solved with Ion Exchange Resins. Both Industry and the Laboratory Find These Resins Valuable
D. H. Killeffer, Howard C. E. Johnson