A railroad chronometer or railroad standard watch is a specialized timepiece that once was crucial for safe and correct operation of trains in many countries...

marked as Certified Chronometer or Officially Certified Chronometer. Outside Switzerland, equivalent bodies, such as the Japan Chronometer Inspection Institute...

A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation...

A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals...

Telegraph Company. Time was also "sold" to the railroads and was used in conjunction with railroad chronometers to schedule American rail transport. Early...

(signalling system) Gantry Institution of Railway Signal Engineers Railroad chronometer Rail sabotage Railway slide fence Signalling block system Signalling...

precision standards and a reliable timepiece inspection system for Railroad chronometers. Temperature-compensated balance wheels began to be widely used...

Clay Ball (1847–1922), American jeweller and watchmaker, Cleveland, railroad chronometer, Hamilton Watch Company. Henri Lioret (1848–1938), French watchmaker...

Webb C. Ball of the General Railroad Timepiece Standards in North America, leading to significance of the railroad chronometer. January – Under the direction...

regulate railroads and ensure fair prices. 1891: Webb C. Ball establishes first Railway Watch official guidelines for railroad chronometers. 1893: Railroad Safety...

featuring a less accurate 21-jewel railroad grade movement.[citation needed] By 1970, 13,086 Hamilton Model 21 Marine Chronometers had been produced. In 1985...

Led to the adoption of stringent quality-control standards for railroad chronometers 1891 Bostian's Bridge train disaster, Statesville, North Carolina;...

Association (AREMA) Association of American Railroads History of rail transport in the United States Railroad chronometer Haines, Henry S., American Railway Management...

caused by railroad engineers' watches not being in sync; and led to the adoption of stringent quality-control standards for railroad chronometers in 1893...

become the impetus for the adoption of new quality standards for railroad chronometers in 1893. May 31 NS (=May 19 OS) – In the Kuperovskaya district of...

system for Railroad chronometers. This led to the adoption in 1893 of stringent standards for pocket watches used in railroading. These railroad-grade pocket...

precision standards and a reliable timepiece inspection system for railroad chronometers. He established strict guidelines for the manufacturing of sturdy...

year Lists of rail accidents List of rail accidents (2000–present) Railroad chronometer Railway Mail Service (USA) Railway post office Railway Mania (UK)...

displacement law. January 2 – Webb C. Ball introduces railroad chronometers which become the general railroad timepiece standards in North America. February...

signals Institution of Railway Signal Engineers Railroad chronometer Railway signal Railway signalling Railroad switch Railway semaphore signal Railway slide...

horizontally. Chronograph Jewel bearing Quartz watch Railroad chronometers Skeleton watch Tourbillon Marine chronometer ETA SA Lemania Hahn, Ed; et al. (The TimeZone...

until 1923. January 2 – Webb C. Ball introduces railroad chronometers, which become the general railroad timepiece standards in North America. January 6...

mathematician Webb C. Ball (1847–1922), American railroad engineer who established the first rules for railroad chronometers William Ball (astronomer) (or Balle)...

the Civil War, the company became the main supplier of railroad chronometers to various railroads in North America and other countries. In 1876, the company...

Introduction by Webb C. Ball of the General Railroad Timepiece Standards in North America: Railroad chronometers 1921 - The Shortt-Synchronome free pendulum...

Ball established the first railway watch official guidelines for railroad chronometers. 1892 – The first horse-drawn tram line in Belgrade, Serbia. 1893...

to convert local time to London Time. In turn, train guards set their chronometers against those clocks. The introduction of railway time was in the end...

east or west their vessel traveled. The invention of an accurate marine chronometer revolutionized marine navigation. By the end of the 19th century, important...

(starting March 4) January 2 – Webb C. Ball introduces railroad chronometers, which become the general railroad timepiece standards in North America. January 17...

Somerville and Easton Railroad, a predecessor of the Central Railroad of New Jersey, is chartered. March 9 – The Richmond and Danville Railroad is chartered in...