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Trench Watch
The trench watch (wristlet) is a type of watch that came into use by the military during World War I, as pocket watches were not practical in combat. It was a transitional design between pocket watches and wristwatches, incorporating features of both. Background The first watch adapted to be worn on the wrist was made in 1810 by Abraham-Louis Breguet, commissioned by Caroline Bonaparte, Queen of Naples. The first series of purpose-made men’s wristwatches was produced by Girard-Perregaux in 1880 for the German Navy. During World War I numerous companies, including Omega, Longines, Elgin and others produced wristwatches for the military. Rolex also produced trench watches. These watches were of virtually identical style with an enamel dial, wide white numerals and a luminescent radium hour hand. Often they did not bear the name of the manufacturer, though the movement, originally designed in the 1890s for ladies’ pendant watches, was marked "Swiss". From pocket watches tho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Trench Watch 1916 Gold
A trench is a type of digging, excavation or depression in the ground that is generally deeper than it is wide (as opposed to a swale (landform), swale or a bar ditch), and narrow compared with its length (as opposed to a simple hole or trapping pit, pit). In geology, trenches result from erosion by rivers or by geological movement of tectonic plates. In civil engineering, trenches are often created to install underground utilities such as Pipeline transport, gas, Water distribution system, water, Underground power lines, power and Undergrounding, communication lines. In construction, trenches are dug for foundations of buildings, retaining walls and dams, and for Tunnel construction#Cut-and-cover, cut-and-cover construction of tunnels. In archaeology, the "trench method" is used for searching and Excavation (archaeology), excavating ancient ruins or to dig into stratum, strata of sedimented material. In geotechnical engineering, trench investigations locate faults and investigat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Elgin National Watch Company
The Elgin National Watch Company, commonly known as Elgin Watch Company, was a major US watch maker from 1864 to 1968. The company sold watches under the names Elgin, Lord Elgin, and Lady Elgin. For nearly 100 years, the company's manufacturing complex in Elgin, Illinois, was the world's largest site dedicated to watchmaking. History The company was first incorporated in August 1864 as the National Watch Company in Chicago, Illinois, by Philo Carpenter, Howard Z. Culver, Benjamin W. Raymond, George M. Wheeler, Thomas S. Dickerson and W. Robbins. In September of the same year, the founders visited the Waltham Watch Company in Waltham, Massachusetts, and successfully convinced seven of Waltham's watchmakers to come to work for their new company. The growing young city of Elgin, Illinois, some 30 miles northwest of Chicago, was chosen as the factory site. Initially, as part of the deal, the city was asked to donate 35 acres (142,000 m2) of land for the construction of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
24-hour Analog Dial
Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution). The more familiar 12-hour analog dial has an hour hand that makes two complete revolutions in a day (12 hours per revolution). Twenty-four-hour analog clocks and watches are used today by logistics workers, fire fighters, police officers, paramedics, nurses, pilots, scientists, and the military, and they are sometimes preferred because of the unambiguous representation of a whole day at a time. Note that this definition refers to the use of a complete circular dial to represent a 24-hour day. Using the numbers from 0 to 23 (or 1 to 24) to mark the day is the ''24-hour clock system''. Sundials use 24-hour analog dials—the shadow traces a path that repeats approximately once per day. Many sundials are marked with the double-XII or double-12 system, in which the numbers I to XII (or 1 to 12) are used twice, once for the morning hou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Sector Clock
A sector clock or colour change clock was a round colour-coded clock used at military airfields and observation posts in the United Kingdom to help track the movements of enemy aircraft and coordinate and control air defences. Overview Developed in the United Kingdom during the First World War and originally known as "colour change clocks", the Royal Flying Corps (RFC) introduced sector clocks in 1917 to aid in the chronological monitoring and position plotting of German aircraft. During the Second World War sector clocks played a significant role in the Battle of Britain as part of the Dowding system of air defence and continued to be used by the Royal Air Force (RAF) and Royal Observer Corps (ROC) as simple clocks and keepsakes until the end of the Cold War. Two versions of the sector clock were supplied for issue by the Air Ministry; the RAF sector clock having a " King's Crown" RAF Warrant Officer's insignia under the "24", the ROC issue clock having no associated insigni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Military Time Zone
The military time zones are a standardized, uniform set of time zones for expressing time across different regions of the world, named after the NATO phonetic alphabet. The Zulu time zone (Z) is equivalent to Coordinated Universal Time (UTC) and is often referred to as ''the'' military time zone. The military time zone system ensures clear communication in a concise manner, and avoids confusion when coordinating across time zones. The CCEB, representing the armed forces of Australia, Canada, New Zealand, the United Kingdom, and the United States, publishes the military time zone system as the ACP 121 standard. The armed forces of Austria and many nations in NATO use it. Description Going east from the prime meridian at Greenwich, letters "Alfa" to "Mike" (skipping "J", see below) represent the 12 time zones with positive UTC offsets until reaching the international Date Line. Going west from Greenwich, letters "November" to "Yankee" represent zones with negative offsets. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Direction Finding Watch
The four cardinal directions or cardinal points are the four main compass directions: north (N), south (S), east (E), and west (W). The corresponding azimuths (clockwise horizontal angle from north) are 0°, 90°, 180°, and 270°. The four ordinal directions or intercardinal directions are northeast (NE), southeast (SE), southwest (SW), and northwest (NW). The corresponding azimuths are 45°, 135°, 225°, and 315°. The intermediate direction of every pair of neighboring cardinal and intercardinal directions is called a secondary intercardinal direction. These eight shortest points in the compass rose shown to the right are: # West-northwest (WNW) # North-northwest (NNW) # North-northeast (NNE) # East-northeast (ENE) # East-southeast (ESE) # South-southeast (SSE) # South-southwest (SSW) # West-southwest (WSW) Points between the cardinal directions form the points of the compass. Arbitrary horizontal directions may be indicated by their azimuth angle value. Determination ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Waltham Watch Company
The Waltham Watch Company, also known as the American Waltham Watch Co. and the American Watch Co., was a company that produced about 40 million watches, clocks, speedometers, compasses, time delay fuses, and other precision instruments in the United States of America between 1850 and 1957. The company's historic 19th-century manufacturing facilities in Waltham, Massachusetts have been preserved as the American Waltham Watch Company Historic District. The company went through a series of bankruptcies and restarts under new ownership, with watches and clocks bearing the Waltham name still being made and marketed today. History The early years, 1849 to 1857 Prior to 1850, watches in America were generally supplied either from England or Switzerland.Caross, "The Waltham Watch Co.," p. 167. The idea for the Waltham Watch Company came from watchmaker Aaron Lufkin Dennison. Dennison was the son of a shoemaker, born in Maine in 1812.Caross, "The Waltham Watch Co.," p. 166. He ser ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Radioactive
Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered ''radioactive''. Three of the most common types of decay are Alpha decay, alpha, Beta decay, beta, and Gamma ray, gamma decay. The weak force is the Fundamental interactions, mechanism that is responsible for beta decay, while the other two are governed by the electromagnetic force, electromagnetic and nuclear forces. Radioactive decay is a randomness, random process at the level of single atoms. According to quantum mechanics, quantum theory, it is impossible to predict when a particular atom will decay, regardless of how long the atom has existed. However, for a significant number of identical atoms, the overall decay rate can be expressed as a decay constant or as a half-life. The half-lives of radioactive atoms have a huge range: f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Radium Dial
Radium is a chemical element; it has symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) upon exposure to air, forming a black surface layer of radium nitride (Ra3N2). All isotopes of radium are radioactive, the most stable isotope being radium-226 with a half-life of 1,600 years. When radium decays, it emits ionizing radiation as a by-product, which can excite fluorescent chemicals and cause radioluminescence. For this property, it was widely used in self-luminous paints following its discovery. Of the radioactive elements that occur in quantity, radium is considered particularly toxic, and it is carcinogenic due to the radioactivity of both it and its immediate decay product radon as well as its tendency to accumulate in the bones. Radium, in the form of radium chloride, was discovered by Mari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Radium
Radium is a chemical element; it has chemical symbol, symbol Ra and atomic number 88. It is the sixth element in alkaline earth metal, group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) upon exposure to air, forming a black surface layer of radium nitride (Ra3N2). All isotopes of radium are radioactive, the most stable isotope being radium-226 with a half-life of 1,600 years. When radium decays, it emits ionizing radiation as a by-product, which can excite fluorescent chemicals and cause radioluminescence. For this property, it was widely used in Self-luminous paint, self-luminous paints following its discovery. Of the Radionuclide, radioactive elements that occur in quantity, radium is considered particularly Toxicity, toxic, and it is Carcinogen, carcinogenic due to the radioactivity of both it and its immediate decay product radon as well as its tendency to B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Rolex
Rolex () is a Swiss watch brand and manufacturer based in Geneva, Switzerland. Founded in 1905 as ''Wilsdorf and Davis'' by German businessman Hans Wilsdorf and his eventual brother-in-law Alfred Davis in London, the company registered ''Rolex'' as the brand name of its watches in 1908 and became ''Rolex Watch Co. Ltd.'' in 1915. After World War I, the company moved its base of operations to Geneva because of the unfavorable economy that led to business instability. In 1920, Hans Wilsdorf registered ''Montres Rolex SA'' in Geneva as the new company name (''montre'' is French for watch); it later became ''Rolex SA''. Since 1960, the company has been owned by the Hans Wilsdorf Foundation, a private family trust. Rolex SA and its subsidiary Tudor Watches, Montres Tudor SA design, make, distribute, and service wristwatches sold under the Rolex and Tudor brands. In 2023, Rolex agreed to acquire its longtime retail partner Bucherer, and in 2024, Rolex began construction of a new Affi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Longines
Compagnie des Montres Longines, Francillon S.A., or simply Longines (), is a Swiss luxury watchmaker based in Saint-Imier, Switzerland. Founded by Agassiz family, Auguste Agassiz in 1832, the company has been a subsidiary of the Swiss The Swatch Group, Swatch Group and its predecessors since 1983. Its winged hourglass logo, registered in 1889, is the oldest unchanged active trademark registered with WIPO. History 1832–1867 Longines was founded in Saint-Imier in 1832 by Agassiz family, Auguste Agassiz, a Swiss watchmaker and brother of biologist Louis Agassiz. Auguste had two partners, lawyers Henri Raiguel and Florian Morel; the company's original name was ''Raiguel Jeune & Cie''. By 1846, Raigeul and Morel had retired from the watch industry, leaving Agassiz as sole company head. Several years later, Agassiz brought in his bright, enterprising nephew, trained economist Ernest Francillon, into the business. Francillon was the mastermind behind several impressive innovations th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
