noun
: an instrument consisting of a graduated limb with a spirit level, and an arm by which it is applied to a cannon or mortar in adjusting the piece to the elevation for the desired range
noun
: an instrument consisting of a graduated limb with a spirit level, and an arm by which it is applied to a cannon or mortar in adjusting the piece to the elevation for the desired range
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012