Evidence
9 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-9).
-
[1]research packet 1012-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-jasper-pyc13-pkt-1012-packet-md
-
[2]Dictionary of American Naval Fighting Ships, 'Jasper I (PYc-13)', Naval History and Heritage Command [nhhc_danfs]
- Locator
- DANFS 'Jasper I (PYc-13)' entry, live NHHC page verified 2026-10-04 (identical text mirrored at losthistory.net/hazegray DANFS Vol. III p. 508 transcription)
- Finding type
- vessel_history
- Finding
- DANFS records: the first Jasper (PYc-13), a diesel-powered yacht, was built as Stranger by Lake Union Dry Dock Co., Seattle, Wash., in 1938; purchased by the Navy 1 July 1941 from owner Fred E. Lewis; renamed Jasper and placed in service at San Diego 8 July 1941. After installation of experimental sound and electronic equipment she was assigned to the 11th Naval District to perform research work at the Naval Sound Laboratory, San Diego, continuing throughout the war in experiments with radio and sound waves in cooperation with the University of California, Division of War Research. Echo-ranging equipment aboard Jasper was used in 1946 to discover a deep 300-mile-wide oceanic layer off the coast of California. She was placed out of service 14 August 1947 at San Diego and turned over to the Maritime Commission for disposal in June 1948. DANFS spec block: t. 230; l. 135'; b. 22'8"; dr. 16'6"; s. 13 k.; a. none (no armament).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1938-1948
- Limitations
- Establishes identity, construction, research service, and disposal. Contains no asbestos, materials, crew-figure, or condition information; supports no asbestos claim. The 'deep 300-mile-wide oceanic layer' finding is quoted as DANFS states it (the deep scattering layer discovery is attributed to UCDWR wartime work in secondary literature - DANFS's own wording is carried).
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pyc13-01
-
[3]NavSource Online: Patrol Craft/Gunboat/Submarine Chaser Photo Archive, Jasper (PYc 13) page [other_primary]
- Locator
- NavSource PYc-13 page, specification block and service-history bullets (live navsource.net domain verified 2026-10-04; navsource.org is dead)
- Finding type
- vessel_history
- Finding
- NavSource Online patrol craft archive records the post-Navy ownership chain: transferred June 1948 to the Maritime Commission for disposal; sold 1948 to Nicholas A. Kessler of Los Angeles and renamed Stranger; donated 22 April 1955 to the Scripps Institution of Oceanography, San Diego, as a research vessel; acquired by the Teledyne Corp.; renamed Explorer in 1976 and operated as a cruise ship; fate unknown. Specifications: displacement 230 t., length 135', beam 22'8", draft 16'6", speed 13 kts., armament none, propulsion two 400-shp Washington diesel engines on two shafts. U.S. Navy photo NH 86368 (c. 1945) credited to NHHC.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1948-1976
- Limitations
- Volunteer-compiled archival photo index, not a government record; its hull timeline and specs agree with DANFS. The Teledyne/Explorer (1976) and 'fate unknown' tail of the chain rests on NavSource alone (partially corroborated by the Classic Yacht Register secondary entry); treat as the best available public record, not a registry-verified disposition. Contains no asbestos or materials information.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pyc13-02
-
[4]Calisphere / UC San Diego Library Special Collections & Archives, item bb3526196k, SIO Photographic Laboratory Collection (SAC 44) [museum_official]
- Locator
- Calisphere item page, 'Item information' caption block (live page verified 2026-10-04)
- Finding type
- historical_record
- Finding
- UC San Diego Special Collections & Archives holds a Scripps Institution of Oceanography Photographic Laboratory image of USS Jasper (PYc-13) at sea during WWII; its catalog caption states the vessel was 'built in 1938 as the yacht "Stranger"' and 'was used by the University of California Division of War Research, under the name U.S.S. Jasper (PYC-13)' - institutional confirmation of the Navy craft's wartime operation by/for UCDWR.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1947
- Limitations
- Caption-level archival metadata corroborating UCDWR use; date listed 'circa 1940' (cataloger estimate - Navy service began July 1941). Contains no asbestos, materials, or crew information.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pyc13-03
-
[5]Scripps Institution of Oceanography / UC San Diego, California Explores the Ocean: 'NORPAC Cruise, 1955' and 'Naga Expedition, 1959-1961' expedition pages [museum_official]
- Locator
- ceo.ucsd.edu NAGA page ('STRANGER, an oceanographic vessel of the Scripps Institution of Oceanography was the principal vessel for the expedition') and NORPAC 1955 page (https://ceo.ucsd.edu/expeditions/1955-norpac.html) - both verified live 2026-10-04
- Finding type
- vessel_history
- Finding
- Scripps Institution of Oceanography's California Explores the Ocean expedition pages document the vessel's post-Navy scientific career as R/V Stranger: one of twenty oceanographic vessels on the NORPAC synoptic survey of the North Pacific (1955), and the principal expedition vessel of the NAGA Expedition (1959-1961), a joint U.S.-South Vietnam-Thailand survey of marine resources in the Gulf of Thailand and South China Sea led initially by Anton Bruun.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1955-1961
- Limitations
- Establishes the vessel's continued scientific employment as R/V Stranger through 1961 (SIO fleet lists place Stranger retirement at 1965). Contains no asbestos, materials, or condition information; supports no asbestos claim.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pyc13-04
-
[6]U.S. National Archives Catalog, NAID 190967431 (RG 24, Muster Rolls of U.S. Navy Ships, Stations, and Other Naval Activities) [other_primary]
- Locator
- NARA Catalog file-unit page NAID 190967431 (catalog.archives.gov search result for exact phrase 'Jasper (PYc-13)', verified live 2026-10-04)
- Finding type
- historical_record
- Finding
- NARA Catalog search surfaced a digitized muster-roll file unit, 'In Service Craft Naval Electronics Laboratory Point Loma, San Diego, CA, 1/1/46 - 7/22/47' (NAID 190967431, RG 24, Muster Rolls of U.S. Navy Ships, Stations, and Other Naval Activities, microfilm roll S-5275), returned on the exact-phrase query 'Jasper (PYc-13)' - consistent with Jasper's documented attachment to the Naval Sound Laboratory / Naval Electronics Laboratory at Point Loma, San Diego, in 1946-47. This is a personnel-records lead for the crew population, not an exposure record.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1946-1947
- Population
- Navy enlisted complement attached to NEL Point Loma in-service craft, Jan 1946-Jul 1947
- Limitations
- Catalog search associates this muster roll with 'Jasper (PYc-13)'; individual frames were not reviewed, so the roll's coverage of Jasper personnel is asserted by the catalog's indexing rather than by direct inspection. Muster rolls are crew rosters - they support population identification, not exposure documentation. Contains no asbestos information.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pyc13-05
-
[7]U.S. National Archives Catalog, series 'Logbooks of U.S. Navy Ships and Stations' (RG 24); archives.gov deck-log access guidance [other_primary]
- Locator
- catalog.archives.gov searches for 'Jasper (PYc-13)', 'Jasper (PYC-13)', and 'Jasper deck log' (2026-10-04); all 'Jasper' logbook hits were PC-486 file units, e.g. NAID 216324856 ('Jasper (PC-486) - January 1956')
- Finding type
- historical_record
- Finding
- NARA Catalog search indicates the ship's WWII-era deck logs are not among the digitized Navy logbook file units: every 'Jasper' logbook file unit in the catalog is for Jasper (PC-486), 1956-1959 (a different hull). Deck logs for PYc-13 covering 1941-1947 exist in paper holdings of RG 24, 'Logbooks of U.S. Navy Ships and Stations,' per the batch research brief and NARA's general deck-log access guidance, but no digitized PYC-13 logbook file unit was located.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1947 (holdings); 2026-10-04 (search)
- Limitations
- Negative search result on the digitized catalog only; paper deck logs 1941-1947 are held by NARA per the research brief but were not individually catalog-verified or pulled. Deck logs would document operations and crew conditions but are not asbestos records.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pyc13-06
-
[8]Batch-8672 search ledger (this record): NHHC DANFS; NavSource; NARA Catalog; Naval Vessel Register; UC San Diego/Scripps official archives and expedition pages; CourtListener API v4 via cl-auth-search.py [other_primary]
- Locator
- search_ledger rows sl-uss-jasper-pyc13-01 through sl-uss-jasper-pyc13-09
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record was located: no asbestos survey, abatement contract, hazmat disposal record, museum/owner disclosure, or docketed case naming USS Jasper (PYc-13), the yacht Stranger, R/V Stranger, or Explorer was found in the public sources searched (see search_ledger). CourtListener opinion search on both the exact name and the hull number returned zero hits; CourtListener docket search was fleet-paced and could not be completed - see ledger.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 2026-10-04
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - a 1938 motor yacht's era-typical materials (gaskets, exhaust lagging, electrical insulation) may have contained asbestos and would not necessarily appear in any surveyed source. Does not establish that asbestos is or is not present; does not establish or defeat any exposure or eligibility claim.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pyc13-07
-
[9]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2 (full text blocked to automated fetch, HTTP 403 - standing defect since Batch-01; content via product-page description)
- Finding type
- gov_survey
- Finding
- GAO documented that the Navy used asbestos insulation extensively aboard ships and did not begin substituting alternative insulation materials until the early 1970s - spanning this hull's entire naval service era (1941-1947) and its 1938 construction year.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1979
- Population
- Navy shipyard workers; asbestos program review (class context)
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull. Does not establish that asbestos was aboard this vessel, nor quantity, location, condition, exposure, or causation. This hull's diesel plant had no boilers or turbines - the principal naval asbestos applications documented in this era were steam-system insulation, of which this craft carried none.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pyc13-08