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	railroad chronometers - Article and Reference from OnPedia.com
		Railroad chronometers (railroader's watches) were critical to the safe and correct operation of trains in the United States.
		Waltham became the official timekeeper of railroads in 52 different countries.
		W.C. Ball's guidlines are the basis of the officially certified Chronometers standards, as now laid out by the "Socit Suisse de Chronomtrie", which was founded in 1924 and "The Swiss Official Chronometer Testing Institute" COSC ("Contrle Officiel Suisse des Chronomtres").
	www.onpedia.com /encyclopedia/railroad-chronometers (278 words)

	Chronometer - Wikipedia, the free encyclopedia
		A chronometer is a timekeeper precise enough to be used as a portable time standard, usually in order to determine longitude by means of celestial navigation.
		To compensate for ever-changing spring strength, the majority of chronometer balances used bi-metallic strips to move small weights toward and away from the center of oscillation, thus altering the period of the balance to match the changing force of the spring.
		Since the natural resonance of an oscillating balance serves as the heart of a chronometer, chronometer escapements are designed to interfere with the balance as little as possible.
	en.wikipedia.org /wiki/Chronometers (1279 words)

	Just What Is A Railroad Watch
		The easy answer to that question is that railroad watches, referred to in the railroad industry as "standard watches" (because they met the railroad's standard), are those watches that were accepted for railroad time service.
		The waters get muddied further by the fact that the requirements for "grandfathered" watches, those that were permitted to remain in service, as opposed to those newly entering service, varied from railroad to railroad and from decade to decade.
		Railroad watch requirements had become so uniform and stable by the mid-teens that South Bend was able to promote its famous 5-year insurance plan.
	www.pockethorology.org /Railroad/Railroad.htm (3278 words)

	History of the Pocket Watch
		This led to the adoption in 1893 of stringent standards for pocket watches used in railroading.
		World War I, when officers in the field began to appreciate that a watch worn on the wrist was more easily accessed than one kept in a pocket.
		However, pocket watches continued to be widely used in railroading even as their popularity declined elsewhere.
	www.edinformatics.com /inventions_inventors/pocket_watch.htm (754 words)

	Railroad chronometer - Wikipedia, the free encyclopedia
		After a serious train accident in Ohio in 1891, caused by the malfunction of an engineer's watch, the North American railroad industry charged its General Time Inspector, Webb C. Ball, to establish unified standards for all the watches used by personnel among the participating railroad companies:
		The Waltham Watch Company quickly complied with the requirements of Ball's guidelines, as soon did Ball Watch Company, Elgin Watch Company, Hamilton Watch Company, and most of the other American watch manufacturers, all applying the American System of Watch Manufacturing.
		The Time Signal Service of the United States Naval Observatory was used to ensure accuracy of railroad chronometers and schedule American rail transport.
	en.wikipedia.org /wiki/Railroad_chronometers (313 words)

	tag heuer
		The economic difficulties brought on by ships depends on the Tag Heuer is the main supplier of Railroad chronometers to the transmissions from the Johnson counters is the Greenwich Time Signal radio stations, which usually have better short term accuracy, with long term accuracy.
		In 1969, Seiko introduced the Seiko automatic Chronometer series, the "Bell-Matic" with a large, scratch resistant crystal covering the face.
		The savonette has a stopwatch function, it is his turn, and/orBecause they are sometimes called chronometers.
	www.beepworld.de /members/a13/tag-heuer.htm (415 words)

	Mass Watchmakers-Clockmakers Association
		Jon Weber spoke on the subject of chronometers and their influence on the development of watches.
		Jon is the Vice President of The Greater Boston Watch Collectors and belongs to several NAWCC chapters.
		His interest is in precision watches, chronometers, pocket chronometers and railroad watches.
	www.plads.com /mwa/index.htm (534 words)

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