Editing Tungsten (section)

===Niche uses===
Applications requiring its high density include weights, [[Mallory metal|counterweights]], ballast keels for yachts, tail ballast for commercial aircraft, rotor weights for civil and military helicopters, and as ballast in race cars for [[NASCAR]] and [[Formula One]].<ref>{{cite web|url=https://www.auto123.com/en/racing-news/f1-technique-the-secrets-of-ballast-in-a-formula-1-car?artid=158384 |title=F1 Technique: The secrets of ballast in a Formula 1 car |work=Auto123.com |date=2013-12-25 |access-date=2019-02-03}}</ref> Being slightly less than twice the density, tungsten is seen as an alternative (albeit more expensive) to lead [[fishing sinker]]s. [[Depleted uranium]] is also used for these purposes, due to similarly high density. Seventy-five-kg blocks of tungsten were used as "cruise balance mass devices" on the entry vehicle portion of the 2012 [[Mars Science Laboratory]] spacecraft. It is an ideal material to use as a [[dolly (tool)|dolly]] for [[riveting]], where the mass necessary for good results can be achieved in a compact bar. High-density alloys of tungsten with nickel, copper or iron are used in high-quality [[darts]]<ref>{{cite book|url=https://books.google.com/books?id=QUyO7jgvOQUC&pg=PA24|page=24|title=Tungsten|author=Turrell, Kerry|publisher=Marshall Cavendish|date=2004|isbn=978-0-7614-1548-0}}</ref> (to allow for a smaller diameter and thus tighter groupings) or for [[Fly tying|artificial flies]] (tungsten beads allow the fly to sink rapidly). Tungsten is also used as a heavy bolt to lower the rate of fire of the [[Cobray Company|SWD M11/9]] sub-machine gun from 1300 RPM to 700 RPM.  Some [[string instrument]] strings incorporates tungsten.<ref>{{cite book | last=Prieto | first=Carlos | title=The Adventures of a Cello | publisher=University of Texas Press | publication-place=Austin | date=2011-02-01 | isbn=978-0-292-72393-1|page=10}}</ref><ref>{{cite book|author=Pickering N. C. |date=1991|title=The Bowed String: Observations on the Design, Manufacture, Testing and Performance of Strings for Violins, Violas and Cellos|location=Mattituck, New York |publisher=Amereon |pages=5–6, 17}}</ref> Tungsten is used as an absorber on the electron telescope on the [[Cosmic Ray System]] of the two [[Voyager program|Voyager spacecraft]].<ref>{{cite web | url = http://voyager.gsfc.nasa.gov/instruments.html#HET | title = CRS Instruments | publisher = NASA | url-status = live | archive-url = https://web.archive.org/web/20170201052738/https://voyager.gsfc.nasa.gov/instruments.html#HET | archive-date = 2017-02-01 }}</ref>