https://spitalfieldslife.com/2013/07/25/terry-smith-envelope-cutter/baddeleybrothersenvelopecutting/ In the midst of life I woke to find myself living in an old house beside Brick Lane in the East End of London Mon, 25 Oct 2021 13:29:51 +0000 hourly 1 https://wordpress.org/?v=6.9.4 https://spitalfieldslife.com/2013/07/25/terry-smith-envelope-cutter/baddeleybrothersenvelopecutting/#comment-1426240 Mon, 25 Oct 2021 13:29:51 +0000 http://spitalfieldslife.com/wp-content/uploads/2013/07/BaddeleyBrothersEnvelopeCutting.jpg#comment-1426240 Envelope cutting is related to the new science of letter locking, developed by an MIT librarian. Letter locking is the process by which letters to be sent are made unreadable to the casual handler. See e.g., https://www.youtube.com/watch?v=W9IQP93tzFU

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