Science: Water Chaser

SCIENCE

The most important thing about an amphibious jeep or truck is that it should keep afloat; the next most important, that its ignition system should keep dry. Fortnight ago U.S. Industrial Chemicals, Inc. was permitted to tell how the second requirement has been met in World War II. The electrical parts are painted with a compound known as PiB (protects, insulates batteries), which is brushed or sprayed over the spark plugs, battery terminals and exposed electrical parts. There it dries slowly to produce a highly insulating but flexible film, making the circuits impermeable by water.

PiB's composition is still secret, but...

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