National Geographic : 1951 Jan
i) lalonal veogral leov cltesLy 4' Wire Gets the Shock Treatment; Insulation Is Tested Under Water As the operator dips each reel into the tank, he turns on a 1,500-volt current. Any fault in the insulation is automatically revealed by the short circuit's bubbly hiss. In this manner General Electric Company tests wire at its Lowell plant. Kodachromes by Robert F. Sisson + For a Pair of Flashing Red Shoes, Kidskin Takes On a Deep Dye L. H. Hamel Leather Corporation, Haverhill, Massa chusetts, carries on a pioneer industry. Haverhill tan ners bought pelts from Indians as long ago as 1643. By 1951 the city's shoe factories had grown to 45. Today Lynn and Brockton dispute its shoe supremacy.