. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 26 KENNETH HARTLEY The instrument must be very accurately leveled, that is, the axis of the instrument must be in the direction of the gravitational force. An angle of ninetv seconds between the axis of the instrument and the true vertical would 1 1 i 9L ^â A m\*» , â '' ^B Fig. 2. The gravimeter controls and adjustments. theoretically cause an error of one part in ten million, but it would cause a much greater difference in the actual measurement because of lateral strains in the filaments carryin
. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 26 KENNETH HARTLEY The instrument must be very accurately leveled, that is, the axis of the instrument must be in the direction of the gravitational force. An angle of ninetv seconds between the axis of the instrument and the true vertical would 1 1 i 9L ^â A m\*» , â '' ^B Fig. 2. The gravimeter controls and adjustments. theoretically cause an error of one part in ten million, but it would cause a much greater difference in the actual measurement because of lateral strains in the filaments carrying the beam and mirrors. The present instrument is. Fig. 3. The gravimeter in the field. easily adjusted to thirty seconds and that seems to be sufficiently close for the purpose. The dial readings give a direct measure of the differences in gravity and do not require any correction except to multiply by the calibration factor for 170. 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
Size: 2053px × 1217px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, booksubjectpetroleum, booksubjectprospecting
