TH. GRAY. — On a new standard sine-galvanometer (Nouvelle boussole des sinus); Philosophical Magazine, 5e série, t. XXII, p. 368; 1886. H. CrevauxJ. Phys. Theor. Appl., 6 1 (1887) 247-248DOI: https://doi.org/10.1051/jphystap:018870060024701