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Purple parchment. Purple parchment or purple vellum refers to parchment dyed purple; codex purpureus refers to manuscripts written entirely or mostly on such parchment. The lettering may be in gold or silver. Later [when?] the practice was revived for some especially grand illuminated manuscripts produced for the emperors in Carolingian art and ...
Mortise lock. The two main parts of a mortise lock. Left: the lock body, installed in the thickness of a door. This example has two bolts: a sprung latch at the top, and a locking bolt at the bottom. Right: the box keep, installed in the doorjamb. A mortise lock (also spelled mortice lock in British English) is a lock that requires a pocket ...
Duplicating machines were the predecessors of modern document-reproduction technology. They have now been replaced by digital duplicators, scanners, laser printers and photocopiers, but for many years they were the primary means of reproducing documents for limited-run distribution. The duplicator was pioneered by Thomas Edison and David ...
A mimeograph machine (often abbreviated to mimeo, sometimes called a stencil duplicator or stencil machine) was a low-cost duplicating machine that worked by forcing ink through a stencil onto paper. [1] The process was called mimeography, and a copy made by the process was a mimeograph . Mimeographs, along with spirit duplicators and ...
A lever tumbler lock is a type of lock that uses a set of levers to prevent the bolt from moving in the lock. [1] In the simplest form of these, lifting the tumbler above a certain height will allow the bolt to slide past. The number of levers may vary, but is usually an odd number for a lock that can be opened from each side of the door in ...
All told, about one in five Americans aged 65 and older are employed, according to the Census Bureau. Many older adults are wary of seeing a peer shoved aside because of his age and, like Forest ...
Operational. Site history. Built. 1942. Letterkenny Army Depot (originally Letterkenny Ordnance Depot ), the Center of Industrial and Technical Excellence (CITE) for Air Defense and Tactical Missile Systems, was established in early 1942. [1] [2] Its leadership began recruiting civilian personnel in July 1942. [3] The Depot is under the command ...
Analog of the Japanese Type B Cipher Machine (codenamed Purple) built by the U.S. Army Signal Intelligence Service Purple analog in use. In the history of cryptography, the "System 97 Typewriter for European Characters" (九七式欧文印字機 kyūnana-shiki ōbun injiki) or "Type B Cipher Machine", codenamed Purple by the United States, was an encryption machine used by the Japanese Foreign ...