How was the waterproof barrier constructed using the rubber solution in the original design?

Answer

Sandwiching the solution between two pieces of cloth.

The crucial next step involved sandwiching the rubber-treated piece of cloth between another piece of untreated cloth, trapping the solution between two textile surfaces.

How was the waterproof barrier constructed using the rubber solution in the original design?

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The story of Charles Mackintosh - he invented rainwear! - YouTube

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