Aldrich Thomas C.

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Aldrich
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Thomas C.
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  • Technical Report
    Technical progress report : advanced marine technology 1 August 1972 - 31 January 1973
    (Woods Hole Oceanographic Institution, 1973-06-01) Aldrich, Thomas C. ; Maxwell, Arthur Eugene ; Bowin, Carl O. ; Luyendyk, Bruce P. ; Phillips, Joseph D. ; Hess, Frederick R. ; Vine, Allyn C. ; Ballard, Robert D. ; Marquet, William M. ; Porter, David L. ; McCamis, Marvin J. ; Winget, Clifford L. ; von Herzen, Richard P. ; Williams, David L.
    The work sponsored by ARPA at Woods Hole Oceanographic Institution is having an impact on efforts by those not directly involved in the projects both within and without the Institution. The navigation system being developed for submersible/mother ship has been recognized as a very useful system by members of the Geology/Geophysics Department and the Department of Physical Oceanography. Each department is now developing their own system based on the work already completed by the Ocean Engineering Department under the ARPA contact. Through the ARPA contract ComPhibLant (specifically ComPhibRonTen) was shown some of the advantages of doing something new about small boat and heavy object handling at sea and this program is expected to have some direct effect upon methods they will use in the future. Although the project concerned with developing biological equipment for deep sea work has not continued as part of the ARPA program, the seed was succssfully sown and several items are being developed at the Institution under separate funding. All the projects continued at a fair pace but not without some problems. The Deep Sea Rock Drill had some minor setbacks during operations with ALVIN, and the Air-Sea System (Long Range Ech-Ranging) project was hampered by a faulty engine aboard the air craft. Summaries of progress are given immediately below and more detail is available in the individual reports further on.
  • Technical Report
    Technical progress report : advanced marine technology 1 February 1972 - 31 July 1972
    (Woods Hole Oceanographic Institution, 1973-02-28) Aldrich, Thomas C. ; Maxwell, Arthur Eugene ; Ballard, Robert D. ; Bowin, Carl O. ; Luyendyk, Bruce P. ; McCamis, Marvin J. ; Phillips, Joseph D. ; Porter, David L. ; Vine, Allyn C. ; Teal, John M. ; Marquet, William M. ; Winget, Clifford L. ; von Herzen, Richard P. ; Williams, David L.
    The two extremes of the program in this six month period were the Submerged Navigation System which was demonstrated to be a successful field system, and the near Bottom Continuous Gravity System, which was priced out of the market by the acceleration characteristics of ALVIN. In all the other subjects discussed in summary immediately below and in more detail further on, satisfactory progress was made. Again aircraft scheduling has held up further work on the Air Sea Systems project, but there is definite hope for some aircraft tiem in the fall. The Development of Equipment for Deep Sea Biological Research has been terminiated as of the beginning of this report.
  • Technical Report
    Gravity data obtained during Chain cruise 73
    (Woods Hole Oceanographic Institution, 1969-03) Bowin, Carl O. ; Aldrich, Thomas C.
    This report presents the results of gravity measurements obtained aboard the Research Vessel CHAIN of the Woods Hole Oceanographic Institution during cruise 7 3, 6 to 26 September 1967. Information on bathymetry and other studies conducted during CHAIN cruise 73 may be found in W.H.O.I. Reference No. 68-50 (Knott, et al., 1968). Gravity measurements were made simultaneously with the Massachusetts Institute of Technology (MIT) vibrating string gravity meter and with LaCoste and Romberg sea gravity meter number S-13. The data presented is a selective composite of information from both meters . The base reference station used for the measurements is at the W. H. 0. I. dock in Woods Hole, Massachusetts. Its gravity value was taken to be 980327. 0 mgal, however, recent ties of this station to national gravity network stations (Anonymous, 1965) in the Boston, Massachusetts area indicate that this reading is high by about 1. 4 mgal. Thermal and electrical difficulties with the MIT meter made port-to-port drift prediction uncertain (Bowin, Wing and Aldrich, in press). Drift rate for this meter was determined on the basis of its continuous averaged differences with the LaCoste and Romberg meter. This method showed the MIT meter drifting with respect to the LaCoste and Romberg meter by+ 1. 611 mgal per day for the cruise period. Drift of the LaCoste and Romberg gravity meter during CHAIN 73 was - 0.026 mgal/day from in-port measurements at beginning and end of cruise. This last drift value is anomalous in sign and magnitude with respect to the meter's over-all drift rate , and was not applied. The accuracy of the sea measurements is estimated to be about ±10 mgal (Bowin, Wing, and Aldrich, in press). Free -air anomaly values were calculated using the 1930 International Gravity Formula. Water depths are in meters corrected according to the tables of Matthews ( 1939). Bouguer anomaly values were calculated using an infinite slab correction and an assumed crustal density of 2. 67 gm/cm3 . A density of 1. 03 gm/cm3 was assumed for sea water.