Keywords: BL 10 inch 30 calibre Armstrong gun diagrams.jpg Diagrams showing barrel and breech mechanism of Armstrong 10-inch 30 calibre rifled breechloading naval gun as purchased by Australian colony of Victoria Plate I in Instructions For 10 Inch Rifled Breech Loading Armstrong Gun and Automatic Naval Carriage And Slide <br>Downloaded from National Archives of Australia http //recordsearch naa gov au/scripts/Imagine asp B 4039832 circa 1880 s Armstrong Mitchell Elswick Works PD-Old Gun barrels BL 10 inch Gun breeches BL 10 inch Elswick Ordnance Company Naval guns of the United Kingdom 254 mm artillery |