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  2. Letter scale - Wikipedia

    en.wikipedia.org/wiki/Letter_scale

    Bilateral letter scale, collections of the Maison Losseau. 19th Century letter scale used at the Mangōnui Post Office. A letter scale is a weighing scale used for weighing letters in order to determine the correct amount of postage. Until the 1990s most letter scales were mechanical, but today electronic scales are the most common.

  3. Postage meter - Wikipedia

    en.wikipedia.org/wiki/Postage_meter

    A postage meter or franking machine is a mechanical device used to create and apply physical evidence of postage (or franking) to mailed items. Postage meters are regulated by a country's postal authority. A postage meter imprints an amount of postage, functioning as a postage stamp, a cancellation and a dated postmark all in one.

  4. Weighing scale - Wikipedia

    en.wikipedia.org/wiki/Weighing_scale

    A mechanical scale or balance is used to describe a weighing device that is used to measure the mass, force exertion, tension, and resistance of an object without the need of a power supply. Types of mechanical scales include decimal balances, spring scales, hanging scales, triple beam balances, and force gauges.

  5. Postage stamps and postal history of the United States

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    Postal service in the United States began with the delivery of stampless letters whose cost was borne by the receiving person, later encompassed pre-paid letters carried by private mail carriers and provisional post offices, and culminated in a system of universal prepayment that required all letters to bear nationally issued adhesive postage stamps.

  6. Grumman LLV - Wikipedia

    en.wikipedia.org/wiki/Grumman_LLV

    Like the older postal-service Jeep DJ-5, the Grumman LLV features a right-hand-drive (RHD) configuration, in contrast to the typical left-hand-drive (LHD) position of vehicles in North America. It also features a large metal tray, which is able to hold three trays of letter mail, mounted where a passenger seat would normally be.

  7. Edwin Hill (engineer) - Wikipedia

    en.wikipedia.org/wiki/Edwin_Hill_(engineer)

    Inventing first letter scale and a machine to fold envelopes Edwin Hill (25 November 1793 - 6 November 1876) [ 1 ] was a Victorian postal official, the older brother of Rowland Hill , who invented a mechanical system to make envelopes and who campaigned for legal and political change.

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