The Multishot Timer

Depending on the manufacturer, some tools allow the operator to specify the interval between shots, while others are fixed. This interval is commonly in the one to three shots per minute range, and in normal applications, is adequate. As the instrument is dropped or "go devilled" inside the drill pipe, and the surveys taken when the pipe is placed in the slips on tripping put of the hole, in most cases, one survey per minute would be acceptable. The capacity of the Multishot to store data depends upon the amount of photographic film that can be stored in the camera unit. In the case where the pipe is pulled extremely slowly, or reciprocated for long periods, and where the hole depth dictates a lengthy trip out of the hole, longer periods between shots can extend the running time of the instrument and allow a full survey in one run.

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