Bletchley Park 18-7-25 98 Hut 6 Netz Room

Netz Room

To test out possible settings for the day’s Enigma keys, large pieces of paper, known as Netz sheets, were punched through with holes according to the keys sent in various messages. The sheets were then stacked over a light. If the light shone up one hole through the whole stack it was called a ‘drop’ indicating settings that might be correct.

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