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One of a group of eleven specimens illustrating the method of jointing the core of the Atlantic cable laid in 1866 - the first layer of gutta-percha insulation applied
One of a group of eleven specimens illustrating the method of jointing the core of the Atlantic cable laid in 1866 - the second layer of gutta-percha insulation applied
One of a group of eleven specimens illustrating the method of jointing the core of the Atlantic cable laid in 1866 - the third layer of gutta-percha insulation applied
One of a group of eleven specimens illustrating the method of jointing the core of the Atlantic cable laid in 1866 - the fourth layer of gutta-percha insulation applied