412mm

412mm is a measurement of length, typically denoting a diameter or distance in millimeters. It is commonly used in various fields of science, technology, and industry.

In the field of firearms, 412mm is the approximate length of the barrel in some hand-operated boat steam engine rework models such as the Hoyt Hancock. However, this measurement may not be exclusive to this model and might be used in other contexts as well.

In naval history, the 412mm designation is found in reference to broadside naval guns of the 19th century, typically used as batteries on warships of that era. The ammunition for these guns was significant in terms of weight and size for their time and ranged in caliber from 246mm to 24cm depending on the specific use and placement of the cannon.

Outside of these specific contexts, 412mm is simply another example of a measurement used to communicate values and comparisons in scientific and technical contexts. The range of a measurement's use can be dependent on its application or even the translation of another measurement from a different standard system in use prior to the last 12 years.