Abstract
A description is given of a photographic-type recording micro-ammeter, constructed for use in Nigeria for a study of the earth's electrostatic field near ground level. It was used for recording the current flow from an elevated sharp point, and as this is subject to sudden changes, a high writing speed in the y-direction was required. A 24-hr. record is obtained, on a horizontally-rotating drum, with the aid of a galvanometer which rotates about a vertical axis. Timing marks are added automatically once a minute. Special attention was given to the problem of backlash. The following items are also considered in detail: the auxiliary `retrace' spring, the timing-mark trip mechanism, the magnetically-operated shutter mechanism, and the prismatic mirror. Some concluding notes are given on the performance of the instrument in the laboratory and in the field.
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