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Summary
Title: The California gray whale : papers presented at the California Gray Whale Workshop, Scripps Institution of Oceanography, 21-22 August 1972
Identifier: californiagraywh00sout (find matches)
Year: 1974 (1970s)
Authors: Southwest Fisheries Center (U. S. ); Naval Undersea Center; California Gray Whale Workshop (1972 : San Diego, CA); Hubbs, Carl L. (Carl Leavitt), 1894-1979; Evans, William Eugene, 1930-
Subjects: Gray whale; Gray whale -- Physiology; Gray whale -- Behavior
Publisher: Seattle, WA : National Marine Fisheries Service
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library
Text Appearing Before Image:
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Text Appearing After Image:
Figure 3.—The harness, radio transmitter and timed release mechanism: (A) OAR PT-202 radio transmitter (B) 5 mm curved aluminum dorsal plate (C) Plastic-impregnated nylon re- inforcing sewn on harness of Lino i^ 241 material (D) Nylon reinforcing strap sewn into harness and bolted to dorsal plate (E) Rows of grommets (F) Knurled nuts holding harness to dorsal plate (G) Instrument housing (H) Polyvinyl chloride bat- ten (I) Harness legs with "D" rings (J) Polyurethan flotation device attached by straps to dorsal plate (K) Timed-release mechanism (L) Alu- minum corner posts to which "D" rings of har- ness legs attach (M) Receptacles for above posts—spring loaded (N) Magnesium bolt passes through spring loaded hole in top plate and secured with a nut. Dimensions: (1) Harness width 40 cm (2) Harness length 112 cm from timed—release mechanism to first row of grommets toward the Unison, turned on her side, and rubbed the harness against the hull and keel of the boat— breaking the float partly loose, releas- ing one "D" ring, and snapping the fiberglass radio antenna. Transmission of radio signals immediately ceased. This damage could have been prevent- ed by our maintaining a greater dis- tance from the harnessed animal. The timed-release mechanism contained a ."^-hour bolt which had not released by the time darkness fell. The harness was recovered 2 days later in vegeta- tion along the channel edge, about 2 km from the release point. The second release, timed for some- what less than 5 hours, went flawlessly, including radio tracking and harness release. The third release was planned for 20 hours, with tracking overnight from the Loiisim. To assist after dark should the radio malfunction, a water- proof lifejacket light was ti.xed to the float. Though both radio and light functioned at release, thev failed before 62