Steampunk Energies

[53Bash]

Gyroscopic?  Is a nice mechanical energy storage method, and the effects of precession are odd enough to make for some interesting stuff if you crafted it.  Fictionally, you could either straight up pull off stored kinetic energy (with the usual higher storage density and > 100% efficiency allowed in steampunk) or have the gyro actually generate energy via some esoteric effect.

[newjack]

i found out my "mirror array laser" idea was NOT new. maybe i'd heard of it before, but i was thinking about the ancient story where soldiers blinded an approaching army by flipping their polished shields.

it turns out Archemedes had the same idea ca300bc and called it a DEATH RAY.

[Peter Brassbeard]

Hydrogen peroxide was first produced in the early 19th century.  This chemical, when refined sufficiently to overcome stability issues, can serve as a portable source of instant steam.

[Hurricane Annie]

i found out my "mirror array laser" idea was NOT new. maybe i'd heard of it before, but i was thinking about the ancient story where soldiers blinded an approaching army by flipping their polished shields.

it turns out Archemedes had the same idea ca300bc and called it a DEATH RAY.

 Very prescient