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Railroad chronometers (railroader's watches) were critical to the safe and correct operation of trains in the United States. A system, which relied on accurate timekeeping, called Timetable and Train Order was used to ensured that two trains could not be on the same stretch of track at the same time. A chronometer is a clock designed to have sufficient long-term accuracy that it can be used as a portable time standard on a vehicle, usually in order to determine longitude by means of celestial navigation. ...
Pocket watch A watch is a small portable clock that displays the current time and sometimes the current day, date, month and year. ...
There are various types of trains designed for particular purposes, see rail transport operations. ...
A gantry of British semaphore signals seen from the cab of a steam locomotive. ...
After a serious train accident in 1891 in Ohio, caused by the malfunction of an engineer's watch, the North American railroad industry charged their General Time Inspector Webb C. Ball to establish unified standards for all the watches used by their personnel across the various participating Railroad Companies: 1891 was a common year starting on Thursday (see link for calendar). ...
World map showing location of North America A satellite composite image of North America North America is a continent in the northern hemisphere, bounded on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the south by the Caribbean Sea, and on the west...
This is the top-level page of WikiProject trains Rail tracks Rail transport refers to the land transport of passengers and goods along railways or railroads. ...
Webb C. Ball was born in Fredericktown, Ohio, on October 6, 1847 and became a jeweller & watchmaker. ...
- only American-made watches may be used (depending on availability of spare parts)
- only open-faced dials, with the stem at 12 o’clock
- minimum of 17 functional jewels in the movement, 16 or 18-size only
- maximum variation of 30 seconds (approximately 4 seconds daily) per weekly check
- watch adjusted to five positions (face up, face down, crown up, crown down, or sideways)
- adjusted for severe temperature variance and isochronism (variance in spring tension)
- indication of time with bold legible Arabic numerals, outer minute division, second dial, heavy hands,
- lever used to set the time (no risk of having the stem left out, thus inadvertently setting the watch to an erroneous time)
- Breguet balance spring
- micrometer adjustment regulator
- double roller
- steel escape wheel
- anti-magnetic protection (after the advent of diesel locomotives)
- jim-proof
The Waltham Watch Company quickly complied with the requirements of Ball's guidelines, and soon did Elgin Watch Company and most of the other American watch manufacturers, applying the American System of Watch Manufacturing. Waltham became the official timekeeper of railroads in 52 different countries. Arabic numerals (also called Hindu numerals or Hindu-Arabic numerals) are by far the most common form of symbolism used to represent numbers. ...
The name Breguet can represent: A former French aircraft manufacturer. ...
External, internal, and depth micrometers A micrometer is a widely used device in mechanical engineering for precisely measuring thickness of blocks, outer and inner diameters of shafts and depths of slots. ...
In 1850, Roxbury Massachusetts, David Davis, Edward Howard and Aaron Lufkin Dennison formed together the company that would later become the American Waltham Watch Company. ...
It has been suggested that this article or section be merged with The National Watch Co. ...
Aaron Lufkin Dennison was inspired by the manufacturing techniques of the United States Armory at Springfield, Mass. ...
This is an alphabetical list of countries of the world, including both internationally recognized and generally unrecognized independent states, inhabited dependent territories, as well as areas of special sovereignty. ...
W.C. Ball's guidlines are the basis of the officially certified Chronometers standards, as now laid out by the "Société Suisse de Chronométrie", which was founded in 1924 and "The Swiss Official Chronometer Testing Institute" COSC ("Contrôle Officiel Suisse des Chronomètres"). 1924 was a leap year starting on Tuesday (link will take you to calendar). ...
This article is about the Swiss Official Chronometer Testing Institute, known by its French language acronym of COSC. For the state college in Connecticut, see Charter Oak State College. ...
See also The pocket watch was invented by Peter Henlein in 1510. ...
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