Why Btonze Age?

[Pat Mustard]

How much did technology change between 1870 and 1815? 

How much has it changed between 1870 and today?

Big one I can think of off hand was rifled barrels. Made a huge difference in small arms. Artillery massively improved as well, not alone with rifling but with all other technical improvements. In fact it was the Crimean campaign which showed how outdated the Napoleonic era cannon had become, and the response to that failing lead to the Armstrong gun which is considered the first truly modern artillery.