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Kelvin & James White Ltd ampere

circa 1903

Sir William Thomson's patent electric balance

circa 1890

Galvanometer in Wood Framed Glass Case

1905
Kelvin's Patent electric current balance no. 847, with separate wooden box containing weights, made by Kelvin & James White Ltd, Glascow (Scotland, UK) 1903 circa.

Kelvin's Patent electric current balance no. 847

1903
Ayrton's preliminary ampere balance (without coils)

Ayrton's preliminary ampere balance