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National Watch and Clock Museum, Library and Research Center and offices of the National Watch and Clock collectors Association. The National Association of Watch & Clock Collectors, Inc. (NAWCC) is a nonprofit association of people who share a passion for collecting watches and clocks and studying horology (the art and science of time and timekeeping). [1]
Fortunat Mueller-Maerki Library & Research Center is one of the world's pre-eminent libraries devoted to horology and is located in Columbia, Pennsylvania, United States.. It is operated by the National Association of Watch and Clock Collectors, Inc., for the benefit of both the public and the members of the association.
The National Watch and Clock Museum, Library & Research Center, and offices of the National Association of Watch and Clock Collectors. The National Watch and Clock Museum (NWCM), located in Columbia, Pennsylvania, is one of a very few museums in the United States dedicated solely to horology, which is the history, science and art of timekeeping and timekeepers.
Waltham model 1899 pocket watch movement Movement of a gold Elgin pocket watch, c. 1919. Pocket watch movements are occasionally engraved with the word "Adjusted", or "Adjusted to n positions". This means that the watch has been tuned to keep time under various positions and conditions. There are eight possible adjustments: Dial up; Dial down
Animation of an anchor escapement, widely used in pendulum clocks. An escapement is a mechanical linkage in mechanical watches and clocks that gives impulses to the timekeeping element and periodically releases the gear train to move forward, advancing the clock's hands.
A message sequence chart (or MSC) is an interaction diagram from the SDL family standardized by the International Telecommunication Union. The purpose of recommending MSC (Message Sequence Chart) is to provide a trace language for the specification and description of the communication behaviour of system components and their environment by ...
The tap code is based on a Polybius square using a 5×5 grid of letters representing all the letters of the Latin alphabet, except for K, which is represented by C. . Each letter is communicated by tapping two numbers, the first designating the row and the second (after a pause) designating the column.
Pocket Ref is a general-purpose pocket-sized reference book composed of various tips, tables, maps, formulas, constants and conversions, compiled by Thomas J. Glover. [1] It is published by Sequoia Publishing, and is currently in its fourth edition at 864 pages in length, released in late 2010.