Diagrams, tangent galvanometer scale by W H [William Henry] Preece and H R Kempe Two diagrams, labelled figures 1-2, showing the scale for a tangent galvanometer and a geometrical arrangement relating to the movement of the galvanometer needle. Subject: Scientific apparatus and instruments Prints of these diagrams were published in volume 40 of the Proceedings of the Royal Society alongside the paper 'On a new scale for tangent galvanometers'. 1886