What is Speedometer?
[[File:Animated Aston Martin Speedometer.gif|thumb|200px|{{center|[[animation|Animated]] [[Aston Martin]] Speedometer (MPH)}}]] A '''speedometer''' is a type of [[gauge]] that shows the [[speed]] a [[vehicle]] is moving. It usually shows the speed in [[miles per hour]] (mph) for countries that use the [[statute mile]] for distances or [[Kilometres per hour]] (kph) for countries that use the [[metric system]]. Originally, a speedometer was an [[wikt:option|option]] that car owners could buy to put on their car. Beginning about 1910 it was built into all cars.<ref>{{cite web |url=http://auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/speedometer.htm|title=How Speedometers Work|author=William Harris|website= |publisher=HowStuffWorks/InfoSpace LLC|accessdate=10 September 2015}}</ref> == History == The [[electric]] speedometer was [[invented]] by the [[Croatia]]n [[Josip Belušić]]<ref>{{cite book| last = Sobey| first = Ed| title = A Field Guide to Automotive Technology| url = https://books.google.com/books?id=7GMrH4nRhcAC&pg=PA78| accessdate = 30 January 2015| year = 2009| publisher = Chicago Review Press| isbn = 978-1-55652-812-5| page = 78 }}</ref> in 1888, and was originally called a velocimeter. [[Charles Babbage]] is credited with creating an early type of a speedometer. These were usually fitted to [[locomotive]]s.<ref>{{cite web|url=https://sites.google.com/a/newmyths.com/nmwebsite/non_fiction/charles-babbage-and-the-difference-engine|title=Charles Babbage and the Difference Engine - NewMyths.com|work=google.com|accessdate=30 January 2015}}</ref><ref>{{cite web|url=http://udini.proquest.com/topic/charles-babbage/|title=Udini → Flow|work=proquest.com|accessdate=30 January 2015}}</ref> A speedometer was [[patent]]ed by a [[Germany|German]], [[Otto Schulze]] on October 7, 1902,<ref>{{cite web |url=http://w1.siemens.com/press/en/pp_cc/2005/04_apr/sosep200501_10_(special200504)_1264810.htm |title=Speedometer |publisher=Siemens |date=26 April 2005 |accessdate=30 January 2015 |archive-date=28 Fe