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Envelope-making machines at the Post Office Savings Bank, Blythe House, West Kensington, London Machine Envelope Printer was one of the machine presses at the Bulaq Press. It present now in Bibliotheca Alexandrina. The most famous paper-making machine was the Fourdrinier machine. The process involves taking processed pulp stock and converting ...
The first machine specifically designed to perforate sheets of postage stamps was invented in London by Henry Archer, an Irish landowner and railroad man from Dublin, Ireland. [45] The 1850 Penny Red [ 44 ] [ 46 ] [ 47 ] was the first stamp to be perforated during trial course of Archer's perforating machine.
Envelopes control how sounds change over time. They may control parameters such as amplitude (volume), filters (frequencies), or pitch. The most common envelope is the ADSR (attack, decay, sustain, release) envelope: [8] Attack is the time taken for initial run-up of level from nil to peak, beginning when the note is triggered.
Hannah Teal and James Knight. Margaret Eloise Knight (February 14, 1838 – October 12, 1914 [1] [2]) was an American inventor, notably of a machine to produce flat-bottomed paper bags. She has been called "the most famous 19th-century woman inventor". [3] She founded the Eastern Paper Bag Company in 1870, creating paper bags for groceries ...
t. e. A printing press is a mechanical device for applying pressure to an inked surface resting upon a print medium (such as paper or cloth ), thereby transferring the ink. It marked a dramatic improvement on earlier printing methods in which the cloth, paper, or other medium was brushed or rubbed repeatedly to achieve the transfer of ink and ...
A vacuum tube, electron tube, [1] [2] [3] valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot ...
The first transistor was successfully demonstrated on December 23, 1947, at Bell Laboratories in Murray Hill, New Jersey. Bell Labs was the research arm of American Telephone and Telegraph (AT&T). The three individuals credited with the invention of the transistor were William Shockley, John Bardeen and Walter Brattain.
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 ...