But Alder says scientists now know, it's short by two-tenths of a millimeter. Historically used in many local and regional railways, only a few of which remain today. Following are the factors affecting the choice of a gauge: … Wire Length - meter… The sensors are used for measuring roll lengths, winding lengths and coil lengths, as well as for cutting or cut-to-length control. Indicators are mounted on a sturdy upright support attached to a solid triangular base. Only one remains, but regauged to standard gauge. Jump to navigation Jump to search. Berkley Clip On Line Counter – Outdoors Fishing Rod Gear Outdoorsman Reel Spool. The gauges measure webs, ribbons and stranded or spooled goods as well as goods in pieces made of a wide variety of materials. Delambre headed north and Mechain went south. And over in France, there was plenty of disorder. The job of making the measurements went to two astronomers named Delambre and Mechain. There are two unconnected systems operated by, Several mainly mountainous branch lines, mostly abandoned in the 1990s, never fully interconnected — connected to the, 1,674 km (1,040 mi) used along with standard gauge (471 km (293 mi)), Mostly in cargo railways, including E.F Vitoria-Minas Passenger/Cargo Line and R.R. 1/2 λ dipole (meters) = 142.65 / frequency in Mhz: Full wave loop (feet) = 1005 / frequency in Mhz: Full wave loop (meters… Forty-five years ago, Carey Dalbey purchased his first car – and forty-five years later, he still owns it! If your measurement is in another unit of measure, centimeters for example, then you’ll need to convert to square meters… Alder says there was a simple solution to the problem. Metre-gauge railways are narrow-gauge railways with track gauge of 1,000 mm (3 ft 3 3 ⁄ 8 in) or 1 metre. The meter gauge color is blue in all the versions of Internet Explorer. ... Blade Length … The … 1875-1889. There's another in effect today. These sets combine a wire gauge, a tapered-width feeler gauge, and a set of feeler gauges for tight spots in one tool. Rulers are the most often used length measurement tool that we find in offices, schools, and … The U.S. doesn't routinely use the metric system. But a group of scientists or savant, as they would've been called in those days, had a different idea. Visit our website terms of use and permissions pages at www.npr.org for further information. NIST Museum Collection And indeed, some people from the very beginning had suggested - really, why was it necessary to go so far to find what lay so near? & 1,009 mm (3 ft 3 23 ⁄ 32 in) in Sofia. Copyright © 2014 NPR. PALCA: That's Northwestern University historian of science, Ken Alder. Metre Gauge. With the revival of urban rail transport, metre-gauge light metros were established in some cities, while in other cities metre gauge was replaced by standard gauge. But if the length of a foot is based on the meter, what's the length of the meter based on? Old style wheel followers and shaft encoders are problematic due to slippage between the product and contact … PALCA: So the savant did what savant do - they argued and debated and discussed - trying to decide what aspect of nature they should use to base their unit of measure on. ALDER: The proposal that ended up sort of winning the day was a proposal that based the measure on the size of the world itself. HEIDENHAIN length gauges are available with measuring ranges from 12 mm to 100 mm, so that you can measure very different parts in one measuring setup and avoid frequently changing setups with … Also known as thickness gauges, these tools have straight sides or sides that taper inward toward the end of the piece. The authoritative record of NPR’s programming is the audio record. By knowing the exact latitude of the cities, the savant could use the distance between them to extrapolate the distance from the Pole to the equator. Noun ()(always meter ) A device that measures things. ELOVIS also offers calibratable length … PALCA: So this is a big problem. ALLOSUN Digital Cable Length Multimeter Wire Gauge Phone LAN Network Tracker Tester Temp Ohm Resistance Meter 3.9 out of 5 stars 7 $139.00 $ 139 . INSKEEP: The program that measures up. These units have been specially designed for long gage length applications where low level strain measurements are required. Its MORNING EDITION from NPR News. Gauge … And Mechain even secretly redid some of his measurements, got different numbers and didn't tell anybody. Wire length meters are excellent tools for measuring spooled cable and wire, including copper and aluminum, plus major wire gauges. Previous versions of this story said a platinum bar cast in the 19th century was what the world used as the official length of a meter. PALCA: So that's the story. And they wanted to base the unit on nature, a unit that would be the same for everybody, because nature was the same for everybody. So in the end, that bar of platinum is close to one 10-millionth of the distance from the North Pole to equator. The tapered-width gauge is designed for measuring hole and slot widths and diameters. 875 km (544 mi). Disorder was upsetting. That's the latest question he's posing as part of his series, Joe's Big Idea. And in the end, they create a bar with the calculated the length. Narrow Gauge: width 762 mm and 610 mm or 2’-6” and 2’-0”. The metre gauge is used in around 95,000 … From Wikibooks, open books for an open world < Engineering Tables. 3. The length bars are available in different grades of accuracy and in different sizes, ranging from 20 to 30 mm dia and up to 1 m length. $12.71 + $0.10 shipping . Antenna length based on the following formulars: 1/2 λ dipole (feet)= 468 / frequency in Mhz. Three countries in the world do not routinely use the metric system for making measurements. [1] & 1,009 mm (3 ft 3 23⁄32 in) in Sofia. (operating), Blanc-Argent Railway, from Salbris to Valençay (operating), Chemin de Fer de la Baie de Somme (operating), Laas-Lasa marble quarry railway (operating), Sierra Lumber Company Railroad. Speed and Length Meter (7) Speed and Length Meter for Cables (2) Yarn Speed and Length Meter, Tachometer (3) Yarn Length Meter for Knitting Industries (2) Stroboscopes (10) MS Series (1) 3000 Series (2) DT Series (2) LED Stroboscopes (5) Thickness Gauge (76) Analog Thickness Gauge … JOE PALCA, BYLINE: The 18th century is famously known as the Age of Reason. 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