Registered mail

Definition and stakes

Thomas C. Jefferies,  The Postal System of the United States and the New York General Post Office

“ The handling of registered mail differs chiefly from the handling of ordinary mail in the extra care which is taken to safe-guard it. The aim is to record it at the time of receipt, and to thereafter require all persons handling it to account for it as it passes through their hands along its route. Receipts are required at all points, and the letters are forwarded in pouches secured by "rotary locks," provided with certain numbers running in sequence, controlled mechanically, the mechanism being such that the lock cannot be opened without raising the number at which the lock was set. ”
Source: Gutenberg

Executive Order 10964

“ For the purposes of this section registered mail in the custody of a transporting agency of the United States Post Office is considered within United States Government control unless the transporting agent is foreign controlled or operated. Secret information and material may, however, be transmitted between United States Government or Canadian Government installations, or both, in the forty-eight contiguous States, the District of Columbia, Alaska, and Canada by United States and Canadian registered mail with registered mail receipt. ”
Source: Wikisource

Various,  Scribner's Magazine, Volume 26…

“ In a few minutes, sometimes an hour or more, an entire mail is opened and the room cleared, the registry man getting away to his department with all the registered mails, and the newspaper force wheeling away the baskets full of newspapers and packages. The letters are then divided into four parts—those for New York City proper, those for the rest of the United States and Canada, those for foreign countries which have been sent in open mail to New York, and those which are unpaid or partially prepaid. ”
Source: Gutenberg

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