^ abFenna, Donald (2002). "m. t. s. system". A Dictionary Of Weights, Measures, and Units. Oxford, England: Oxford University Press. p. 281. ISBN019-860522-6. sthéneforce. Symbol sn. Metric-m.t.s. That which produces an acceleration of 1 m·s−2 when applied to a mass of 1 t[onne] = 1 kN. Originally called the funal when proposed by the British Association in 1876, it was renamed by 1914. It was authorized in France by statute of 1919 as part of the m–t–s system.