. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 60 L. D. LEET AND W. M. EWING second. A vacuum-tube driven tuning fork controlled the interruption of a beam of light, thereby producing timing lines, which extended the full width of the record, at intervals of sec. The electrical circuit which was used to detonate the dynamite from the recording location also served for the registration on the record of the in- stant of the explosion. A modified polarized relay in this circuit was actuated both when the firing circuit was closed and when it w
. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 60 L. D. LEET AND W. M. EWING second. A vacuum-tube driven tuning fork controlled the interruption of a beam of light, thereby producing timing lines, which extended the full width of the record, at intervals of sec. The electrical circuit which was used to detonate the dynamite from the recording location also served for the registration on the record of the in- stant of the explosion. A modified polarized relay in this circuit was actuated both when the firing circuit was closed and when it was broken by the ex- plosion. A mirror attached to the moving vane of the relay and in the path. =. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Society of Exploration Geophysicists. Tulsa
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Keywords: ., bo, bookcentury1900, booksubjectpetroleum, booksubjectprospecting
