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- Q1146365 subject Q8792727.
- Q1146365 abstract "A barograph is a recording aneroid barometer. A barograph is used to measure pressure. The pointer in an aneroid barometer is replaced with a pen. It produces paper or foil chart called a barogram that records the barometric pressure over time.Barographs use one or more aneroid cells acting through a gear or lever train to drive a recording arm that has at its extreme end either a scribe or a pen. A scribe records on smoked foil while a pen records on paper using ink, held in a nib. The recording material is mounted on a cylindrical drum which is rotated slowly by clockwork. Commonly, the drum makes one revolution per day, per week, or per month and the rotation rate can often be selected by the user.Alexander Cumming, a watchmaker and mechanic, has a claim to having made the first effective recording barograph in the 1760s. Cumming created a series of barometical clocks, including one for King George III. However, this type of design fell out of favour. Since the amount of movement that can be generated by a single aneroid is minuscule, up to seven aneroids (so called Vidie-cans) are often stacked "in series" to amplify their motion. This type of barograph was invented in 1844 by the Frenchman Lucien Vidi (1805–1866).As atmospheric pressure responds in a predictable manner to changes in altitude, barographs may be used to record elevation changes during an aircraft flight. Barographs were required by the FAI to record certain tasks and record attempts associated with sailplanes. A continuously varying trace indicated that the sailplane had not landed during a task, while measurements from a calibrated trace could be used to establish the completion of altitude tasks or the setting of records. Examples of FAI approved sailplane barographs included the Replogle mechanical drum barograph and the EW electronic barograph (which may be used in conjunction with GPS). Mechanical barographs are not commonly used for flight documentation now, having been displaced by GNSS Flight Recorders.Today, mechanical recording barographs for meteorlogical use have commonly been superseded (though not all) by electronic weather instruments that use computer methods to record the barometric pressure. These are not only less expensive than mechanical barographs but they may also offer both greater recording length and the ability to perform further data analysis on the captured data including automated use of the data to forecast the weather. Older mechanical barographs are highly prized by collectors as they make good display items, often being made of high quality woods and brass.The most common weather Barograph found in homes and public buildings these days are the 8-day type. Some important manufacturers of Barographs are Negretti and Zambra, Short and Mason, and Richard Ferris among others. The late Victorian to early 20th century is generally considered to be the heyday of Barograph manufacture, many important refinments were made at this time, including improved temperature compensation and modification of the pen arm, to allow less weight to be applied to the paper, allowing better registration of small pressure changes (i.e. less friction on the nib). Marine barographs (used on ships) often include damping, this evens out the motion of the ship so that a more stable reading can be obtained, this can be either oil damping of the mechanism or simple coiled spring feet on the base. But, newer solid state, digital barographs from manufactures such as ASI eliminate this issue altogether, since they use no moving parts.".
- Q1146365 thumbnail Barograph.JPG?width=300.
- Q1146365 wikiPageExternalLink www.digitalbarograph.com.
- Q1146365 wikiPageExternalLink www.msc.ec.gc.ca.
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- Q1146365 wikiPageWikiLink Q8792727.
- Q1146365 comment "A barograph is a recording aneroid barometer. A barograph is used to measure pressure. The pointer in an aneroid barometer is replaced with a pen. It produces paper or foil chart called a barogram that records the barometric pressure over time.Barographs use one or more aneroid cells acting through a gear or lever train to drive a recording arm that has at its extreme end either a scribe or a pen. A scribe records on smoked foil while a pen records on paper using ink, held in a nib.".
- Q1146365 label "Barograph".
- Q1146365 depiction Barograph.JPG.