A model HS Leeds and Northrup galvanometer. The device, which is 20 cm in height, was used to measure very small currents before sensitive electronic devices became available. The current passed through the device caused an electric coil, to which a mirror was attached, to rotate. The angle of deflection was then calibrated to indicate the current. Shunts and/or resistors could be used to alter the sensitivity. This device was used in the Nuclear Physics Branch at Chalk River in conjunction with artifacts 2022-048 and 2022-049.
