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This document compiles the available data on the short-barrelled 20cm naval gun, on public display at Ga’an Point, Agat, Guam. It provides a photo documentation of the appearance of the gun in June 1994, when it was treated as part of a metal conservation course. The report follows the appearance of the gun over time and discusses the observable pa...
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This document compiles the available data on the short-barrelled 20cm naval gun, on public display at the Naval Magazine, Guam. It provides a photo documentation of the appearance of the gun in June 1994, when it was photographed as part of a metal conservation course.
Citations
... Short 20cm guns, designed for use on merchant vessels as defense against submarine attacks were drafted into service as coastal defence guns. This study was conceived as a background document to support a number of reports relating to various 20cm dual purpose guns on public display on Guam (Spennemann, 2017a(Spennemann, , 2017b(Spennemann, , 2017d. This document draws together the available technical data on the short-barrelled 20cm naval gun (p. ...
... For in-depth documentation of the gun, see Spennemann (2017d). 7. Gun prior to treatment, June 1994; For details see Spennemann (2017b). 8. Appearance in September 2007. ...
... 8. Appearance in September 2007. For details see Spennemann (2017b). ...
This document compiles the available technical data on the short-barrelled 20cm naval gun, as well as its design cousin, the short-barrelled 12cm gun; and provides photographic data on the appearance of the gun during World War II. A discussion of the extant examples completes the study
... (OPNAV, 1945, p. 58) . (CinCPac-CinCPOA, 1945b) The short-barrelled 20cm guns have been reported as coastal defence guns from Western Micronesia, such as Peleliu, Palau (Denfeld, 1988, p. 71); Saipan (this report) and especially from Guam, where they are on record for: Bangi Point, Guam (Denfeld, 1992, p. 51); 'Gongna Beach ('Gun Beach'), Tumon Bay, Guam (Spennemann, 2017a); Dungcas Beach, Tamuning, Guam (in replica emplacements on the grounds of the Onwards Beach Hotel) (Spennemann, 2017e); Naval Magazine, Guam (on display) (Spennemann, 2017c); and Ga'an Point, Agat, Guam (on public display) (Spennemann, 2017b). ...
... A defining feature of the gun is that the barrel has slid back to the maximum extent of the recoil. This is the only instance of that kind among the extant guns in Micronesia (compare Spennemann, 2017aSpennemann, , 2017bSpennemann, , 2017cSpennemann, , 2017d. Such a slide-back only occurs when a) the hydro-pneumatic recoil mechanism, which relies on hydraulic fluid and compressed air, is interrupted and b) the barrel is sufficiently elevated. ...
This document compiles the available data on the short-barrelled 20cm naval gun, on public display at the ‘Last Command Post’, Marpi, Saipan. It provides a photo documentation of the appearance of the gun over time and discusses the observable pattern of corrosion
... The short-barrelled 20cm guns have been reported as coastal defence guns from Western Micronesia, such as Peleliu, Palau (Denfeld, 1988, p. 71); Saipan (Spennemann, 2017) and especially from Guam. There they are on record for Bangi Point, Guam (Denfeld, 1992, p. 51); 'Gongna Beach ('Gun Beach'), Tumon Bay, Guam (this report); Dungcas Beach, Tamuning, Guam (in replica emplacements on the grounds of the Onwards Beach Hotel) (Spennemann, 2017c); Naval Magazine, Guam (on display) (Spennemann, 2017b); and Ga'an Point, Agat, Guam (on public display) (Spennemann, 2017a). Background to the guns at 'Gun Beach', Tumon, Guam ...
This document compiles the available data on the short-barrelled 20cm naval gun, left in situ at Gogna Beach (‘Gun Beach’),Tumon, Guam. The report provides a photo documentation of the appearance of the gun over time and discusses the observable pattern of corrosion.
... The short-barrelled 20cm guns have been reported as coastal defence guns from Western Micronesia, such as Peleliu, Palau (Denfeld, 1988, p. 71); Saipan (Spennemann, 2017c); and especially from Guam, where they are on record for: Bangi Point, Guam (Denfeld, 1992, p. 51); 'Gongna Beach ('Gun Beach'), Tumon Bay, Guam (Spennemann, 2017a); Dungcas Beach, Tamuning, Guam (in replica emplacements on the grounds of the Onwards Beach Hotel) (Spennemann, 2017e); Naval Magazine, Guam (on display) (this report); and Ga'an Point, Agat, Guam (on public display) (Spennemann, 2017b). ...
... The gun was inspected in late June 1994 as comparison to a 20cm gun displayed at Ga'an Point, Agat (Spennemann, 2017b), which at that time was being treated as part of the metals conservation course and demonstration project 'Conservation Management of Historic Metal in Tropical Environments' (Look & Spennemann, 1994). ...
This document compiles the available data on the short-barrelled 20cm naval gun, on public display at the Naval Magazine, Guam. It provides a photo documentation of the appearance of the gun in June 1994, when it was photographed as part of a metal conservation course.
... The short-barrelled 20cm guns have been reported as coastal defence guns from Western Micronesia, such as Peleliu, Palau (Denfeld, 1988, p. 71); Saipan (Spennemann, 2017c) and especially Guam: Bangi Point, Guam (Denfeld, 1992, p. 51); Gogna Beach ('Gun Beach'), Tumon Bay, Guam (Spennemann, 2017a); Dungcas Beach, Tamuning, Guam (in replica emplacements on the grounds of the Onwards Beach Hotel, this report); Naval Magazine, Guam (on display) (Spennemann, 2017d); and Ga'an Point, Agat, Guam (on public display) (Spennemann, 2017b). Background to the guns at Dungcas Beach, Tamuning ...
... Imagery from the 1970s (Fig. 48) shows the that emplacement was damaged, presumably by naval artillery fire or near misses by aerial bombardment. The gun itself was unaffected, and when assessed in its current state, does not seem to have sustained damage from shrapnel-unlike the gun displayed at Ga'an Point (Spennemann, 2017b). For the most part, it appears that the gun was encroached by heavy coastal vegetation ( Fig. 49; vegetation cut away for the 1975 image: Fig. 48). ...
This document compiles the available data on two short-barrelled 20cm naval gun, on public display at Onward Beach Hotel, Tamuning, Guam. Both guns were removed from their original positions during the hotel development and returned to their positions (albeit swapped over) in faux emplacements made from fibreglass. The report provides a photo documentation of the appearance of the guns in June 1994 and follows the appearance of the guns over time and discusses the observable pattern of corrosion.
