Show center line lett thirteen inch gun D right thirteen inch gun E breech block of left thirteen inch swung open as gun was being unloaded H hodg ns G aleut graeme F man on loader s plat form unloading K man passing shell tongs over to left so as to draw shell when last powder bag was drawn lr rammer electric in rear of gun M electric ammunition hoist controller P bags of powder that F had taken out of gun and laid on turret floor in rear of hinged gate on which he stood R turret hatch S jaws of copper switch for switching current on or off rammer motor this witch was short circuited by a metal bar being ac struck on its jaws the man at passing over the shell tongs may have struck it or F may have leaned or pushed such a metal hook against it arc was caused molten metal and sparks fell from S to P S being five feet above P and conflagration ensued |