Alan provides more information about this gun:
It is a fixed mounting by the look of it unlike the 6in disappearing guns at Lyemun although 10in disappearing did exist, this gun has trunions and a shield against shrapnel etc, interestingly it is a sleeved composite barrel, outer shrunk onto an inner thinner barrel for build up of strength.
Also see pics in
http://www.victorianforts.co.uk/art/disappearing.htm, which shows the mechanism taken from HK that was held at Woolwich museum of artillery, now known as the firepower museum.
Does anyone know which of the Stonecutters batteries this gun was installed at? Denis Rollo's 'The Guns & Gunners of Hong Kong' mentions two batteries with 10-inch guns at Stonecutters:
- Central Battery: [...] Authority for the revision of the Battery to take 1 x 10 inch BL Mark I gun on a RCD carriage [...] In August 1907 1 x 10 inch BL Mark III was mounted on a carriage barbette Mark IV [...] By April 1913 only the 10 inch BL remained. This appears in the Armament Lists until 1919 as "Mounted in Reserve".
- West Battery: [In 1894 there were the following gun groups: 1 x 6 inch, 2 x 10 inch, 1 x 6 pounder, 1 x 6 inch.] By December 1911 [...] the 2 x 10 inch BL were still there although due for removal. These seem to have gone by April 1912.
Also, was this gun damaged accidentally or on purpose?