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The barometer plate itself changes shape with the rising pressure. As it changes the thin bar moves and makes the arm go up and down accordingly. The cylinder spins and the changes are recorded.
The ink inside is still wet believe it or not. We cannot verify operation, so we cannot speak to its accuracy either. The case is made of mahogany with a beveled glass top. 12 1/2″ x 7″ x 7 1/2.
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 knib. 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. 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.
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 Today, mechanical recording barographs for meteorlogical use have commonly been superseded (though not all) by electronic weather instruments that use computer methods to record the barometric pressure.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. 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. Less friction on the nib. But, newer solid state, digital barographs from manufactures such as asi eliminate this issue altogether, since they use no moving parts. Keep scrolling there are 23 more photos.
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As you can see from our feedback, we do not disappoint. Of course, items that need special attention, crating, etc adds to the time frame of those items. Sometimes an item is just too big for any other option. C 1920 Taylor Instrument Co Cyclo-Stormograph-Barograph Barometer Tycos yqz” is in sale since Friday, February 28, 2014. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “estateauctionsinc” and is located in Seaford, Delaware. This item can only be shipped Worldwide.