A number of small unions for scalemakers were established in the nineteenth century including the London Journeymen Scalemakers Trade Protection and Benefit Society. The London Society found improved wages for its membership following the passing of the 1889 Weights and Measures Act and promptly disbanded the union. In 1909 another union, the Amalgamated Society of Scale Beam and Weighing Machine Makers was established initially in Liverpool and Sheffield but this extended gradually. A split in 1923 led to the London section becoming the Society of Scale Beam and Weighing Machinists while Manchester retained the original name (ASSBWMM). The two organisations merged in 1928 with the title Society of Scale Beam and Weighing Machinists and this was changed to the National Union of Scalemakers in 1930. In 1947 it became a member of the Confederation of Shipbuilding and Engineering Unions (CSEU).